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山名 広章, 大西 晃, 長坂 雄次
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セッションID: G142
発行日: 2005/11/02
公開日: 2017/06/19
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Smart radiation device (SRD), that is a variable emittance radiator, has been developed as thermal control material for the spacecraft. The hemispherical total emittance ε_H of the SRD controls depending on its temperature. The device is required to improve for the variation of the hemispherical total emittance ⊿ε_H and solar absorptance α_s. This paper presents the ε_H and α_s design of the SRD with spectral selective multilayer films. The optimum design of the new multilayer film is composed by the calculation method based on the genetic algorithm (GA). The GA enables to design the optimal sequence of the materials along with thickness and layers number.
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松原 幸治, 須藤 剛, 元井 大介, 小林 睦夫, 松平 雄策
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セッションID: G143
発行日: 2005/11/02
公開日: 2017/06/19
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An experimental study was made for freeze-concentration of 1% water-solution of sodium chloride in a cylindrical container. Comparison was made between the case where the container is kept still and the case where the container is rotated at constant speed. In the latter, rotation number is kept at 60rpm through the experiments. It was found that container rotation enhances concentration performance. Distribution factor for non-rotation case and rotation case were 0.50 and 0.28, respectively.
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門出 政則, 光武 雄一, Peter Woodfield, 丸山 晋一
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セッションID: G144
発行日: 2005/11/02
公開日: 2017/06/19
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An experiment has been made to measure the rise in temperature of a gas during filling a tank at high pressure. The experimental condition is that filling gases are Nitrogen and Hydrogen at a pressure of 5 to 35MPa and at a filling mass of G=45 to 324g/min for Hydrogen. The temperatures are measured either horizontally or vertically at five positions in the tank. It is found that heat loss transferred from compressed gas to the tank wall has a significant effect on the rise in the filled gas temperature. The heat transfer coefficient is estimated after the end of filling and is about α_h=270W/(m^2K) for the Hydrogen at 35MPa. A theoretically procedure is proposed to calculate the temperature increase of the gas on a basis of assumption that the gas temperature in the tank is uniform at any time, and the heat transfer coefficient is given. The calculation shows that the temperature is in reasonable agreement with the measured temperatures by assuming α_h=500W/(m^2K) during the filling of hydrogen at 35MPa, although the estimated heat loss after the end of filling becomes larger than the actual one.
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林 伊久, 鶴田 隆治
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セッションID: G151
発行日: 2005/11/02
公開日: 2017/06/19
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We have developed a microwave reduced-pressure drying as a new method replacing the warm -air drying. The drying time of seafood was successfully shortened to about 1/20 of the warm-air drying by the temperature control and it resulted in the good quality of drying. In this report, we made a small -scale prototype of drying equipment and investigated the energy efficiency and the drying characteristics of scallops. It was found that the maximum value of the energy efficiency was attained at the microwave power of 12.5W per one scallop. We can raise the energy efficiency to about 55% by the temperature control.
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高橋 和雄, 東 康夫, 三宅 俊也, 田頭 成能
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セッションID: G152
発行日: 2005/11/02
公開日: 2017/06/19
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Effective utilization of waste heat from municipal solid waste incineration plants and biomass power plants has become very important to reduce CO_2 emissions. But it is difficult to use waste heat on site or very near by. Because waste heat from municipal solid waste incineration plants is too many value to use for heating and cooling applications on site. We need the method to transport waste heat to heating and cooling applications of other site. Kobe Steel Ltd. is developing latent thermal energy storage equipment for this transport system. The erythritol of phase change material (PCM) and direct contact heat transfer technology are being used for this equipment. Direct contact heat transfer technology is thermal energy storage method of contacting heat medium to PCM directly. The advantages are high performances of heat input and heat output, light weight equipment by no heat exchanger. This time, in order to study the applicability as a heat source to the absorption refrigerator of this system, the experiment which used thermal energy storage cassette and absorption refrigerator was carried out. As a result, stable operation of this system and the effect of fuel consumption reduction were obtained.
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三瀬 農士, 川瀬 峻介, 佐藤 春樹
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セッションID: G153
発行日: 2005/11/02
公開日: 2017/06/19
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We have investigated energy demand at Shonan Fujisawa Campus of Keio University, and then researched relation between energy demand and average ambient temperature. Taking ambient condition such as temperature into consideration, characteristics of energy demand will be clarified and can be forecasted for the future. To make this forecast practical, the details of energy demand have to be cleared. We estimated power demand of each air conditioning system, because it is related with ambient condition deeply. Energy supply system should be optimized to minimize primary energy consumption after these investigations regarding energy demand. Operation of cogeneration system at SFC leads to reduction of maximum power demand, and its exhaust heat is effectively used as low temperature heat source of central air conditioning system. University can contribute to community as not only refuge area but also energy center in case of disaster. In the future, energy system in university is expected to be reviewed considering these matters.
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西尾 茂文, 上村 光宏, 齋藤 美紀子, 加藤 邦男, 水野 潤, 本間 敬之
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セッションID: G154
発行日: 2005/11/02
公開日: 2017/06/19
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In the present study, thermal performance of a thin heat spreader composed of a sub-milli-chanel COSMOS heat pipes (COunter Stream Mode OScillation flow heat pipe) manufactured by plating or cutting technique was examined. The working fluid in the rectangle pipe was oscillated by a pump and the length of the each side of the rectangle are under 1mm. The effects of the frequency, amplitude, heat input and the posture on the effective heat transfer rate were tested in detail. The experimental result was in good agreement with the prediction by Nishio et al.. It is shown that the theoretical prediction of the heat transfer performance of a sub-milli-chanel COSMOS heat pipe is possible.
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水野 望, 田川 正人, 北村 憲彦
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セッションID: G161
発行日: 2005/11/02
公開日: 2017/06/19
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A numerical analysis method for investigating the frequency response of the internal temperature field of a solid body was developed to improve the thermal analysis relevant to industrial processing such as casting and hot forging. In comparison with the conventional time-domain analysis, the proposed method has the advantages that there is no need to judge whether the thermal response has reached a steady state or not, and that the frequency response can be naturally provided over the entire region inside the solid body.
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山下 徹, 古嶋 薫, 縄田 豊, 若松 和哉
原稿種別: 本文
セッションID: G162
発行日: 2005/11/02
公開日: 2017/06/19
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As one of the studies for the development of the application field of infrared reflecting furnace, experiments and numerical simulations based on the experimental data were carried out to examine the heat transfer characteristics from the start of heating to the steady state. Following results were obtained. (1) Heater electrical input for the same core temperature increases with increasing core tube diameter. (2) Elapsed time to steady state for the same core temperature becomes longer with larger diameter core tube, although the rate of increase becomes smaller.
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奥宮 正洋, 羽木 敏, 梅田 良人, 恒川 好樹, 折田 和也
原稿種別: 本文
セッションID: G163
発行日: 2005/11/02
公開日: 2017/06/19
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In this study the natural gas which is available from the lifeline is applied to vacuum carburizing. The gas composition inside the furnace was analyzed by the gas chromatography in order to examine the carbon infiltration mechanism. Unsaturated hydrocarbon gases are generated from the natural gas. The effect of acetylene concentration in the furnace on the carbon infiltration rate was investigated. The carbon amount which infiltrates into the steel increases, as acetylene concentration in furnace increases. The carbon concentration of specimen surface does not decrease, even if the natural gas flow decreases, because carbon atoms which are consumed for diffusion to inside are sufficiently supplied. By using this method, inhibition of soot generation, reduction of process gas and shortening of the carburizing period are possible. The carbon concentration profile of the vacuum carburized specimen was compared with the simulation.
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安岡 正喜, 西村 ゆつき, 長岡 孝明, 渡利 広司
原稿種別: 本文
セッションID: G164
発行日: 2005/11/02
公開日: 2017/06/19
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The advantages of microwave sintering are as follows: 1) selective heating can be performed, 2) homogeneous heating is achieved, and 3) the temperature can be raised or lowered rapidly. By employing these advantages efficiently, a magnetron is used for the source of microwave in microwave sintering process. There are two kinds of the control methods of the magnetron. The first temperature control method adjusts the irradiation time of microwave which kept the output by fixing voltage and current. The second one adjusts the power which controlled voltage and current. In this study, we examined the influence on the energy saving when a different irradiation method was used in the micro wave sintering process.
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權 容〓, 土田 昌直, 宮里 義昭, 青木 俊之
原稿種別: 本文
セッションID: A211
発行日: 2005/11/02
公開日: 2017/06/19
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The present study describes an experimental work to investigate the effect of a nozzle exit reflector on supersonic jet that is discharged from a convergent-divergent nozzle. An annular reflector is installed at the nozzle exit and its diameter is varied. Flow visualization and impact pressure measurement are accomplished. The results obtained show that the presence of reflector at the nozzle exit leads to increased oscillation of supersonic jet. For imperfectly-expanded jets, the reflector substantially increases the jet mixing and reduces the supersonic length of the jet. The reflector effect appears more significantly in imperfectly-expanded jets that have strong shock cell structures, but is negligible in correctly-expanded jet.
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金城 芳雄, 屋我 実, 親川 兼勇
原稿種別: 本文
セッションID: A212
発行日: 2005/11/02
公開日: 2017/06/19
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In this paper, the flow fields of underexpanded impinging jet issued from rectangular nozzles of aspect ratio 1, 3 and 5 are numerically and experimentally studied. Two dimensional temperature and pressure distributions are measured by using infrared camera and the combination of a pressure scanning device and a stepping motion, respectively. The variation in the stagnation pressure on the impinging plate reveals that a hysteretic phenomenon exists during the pressure of increasing and decreasing the pressure ratio for the aspect ratio of 3.0 and 5.0. The comparison between the calculations and experiments is fairly good. However, the hysteresis of the pressure variations observed in the experiments between the pressure ratio of 3.5 and 4.5 cannot be confirmed in the calculations.
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瀬名波 出, 親川 兼勇, 屋我 実, 宮藤 義孝, 檜和田 宗彦
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セッションID: A213
発行日: 2005/11/02
公開日: 2017/06/19
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This paper shows how heat transfer enhancement is improved by the reattachment air flow contained a little mist. Vaporization of mist caused by differences of absolute humidity between upstream and reattachment regions makes heat transfer downstream from step increase rapidly, when the shear layer of dividing stream line being separated from upstream step absorbed a little mist at upstream point and then reattached near the wall surface downstream. This method is attracted in heat transfer enhancement for the heat transfer coefficient is rapidly increased and simple supplying water unit only set up to the heat exchanger.
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落 章, 瀬名波 出, 屋我 実, 親川 兼勇
原稿種別: 本文
セッションID: A214
発行日: 2005/11/02
公開日: 2017/06/19
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This paper shows how the heat transfer characteristics are affected by Reynolds number and separation distance between jet exit and impingement plate when the multiple jets struck the heating surface. Time and Spatial temperatures were measured by means of infrared camera of which scans 120×160 points per 0.01seconds. For the ranges of Reynolds number from 1600 to 6300, and ratio of the separation to jet diameter of 2〜20, the isotherm image and the local heat transfer distributions are shown and discussed on the relationship among jet, spent flow, and heat transfer mechanism, furthermore the relation among the averaged Nusselt number, Renolds number, and separation ratio are formulated.
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武田 哲明, 一宮 浩市, 山内 大樹
原稿種別: 本文
セッションID: A221
発行日: 2005/11/02
公開日: 2017/06/19
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A technology development of a hydrogen production system by a nuclear heat is being performed as a heat application system of a high-temperature gas cooled reactor in the Japan Atomic Energy Research Institute. The objective of this study is to clarify heat transfer characteristics of the steam reformer inserted metallic wire with high porosity. An experiment has been performed using a double coaxial channel and single channel with metallic wire to obtain the heat transfer characteristics. From the results obtained in this experiment, it seems to be probable that an enhancement of heat transfer method using metallic wire inserts is further improved under the high temperature conditions in efficiency as compared with the conventional reformer.
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一宮 浩市, 武田 哲明, 山内 大樹
原稿種別: 本文
セッションID: A222
発行日: 2005/11/02
公開日: 2017/06/19
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A hydorogen production system using nuclear heat is performed as a heat application system of HTTR in JAERI. In the present studies heat transfer improvement in the reformer tube is examined using a porous material with high porosity. In the first report, the heat transfer and flow characteristics of an annular tube were examined experimentally to obtain the basic data. These results were compared with the convenient data.
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堀尾 幸加, 檜和田 宗彦, 三松 順治, 親川 兼勇, 布林 白拉
原稿種別: 本文
セッションID: A223
発行日: 2005/11/02
公開日: 2017/06/19
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The impinging jet has been used in many industrial fields, such as, the heating, cooling and drying of glass, paper, fiber, and steel. Recently, it is shown that tone-excitation gives a remarkable variation on thermal and pressure fields on the target plate, when its tone-excitation with a specific frequency for an oval jet is vertically added in the direction of the flow of the jet. This report examined the effect of tone-excitation on the interference of free jet, and the impingement heat transfer characteristics from dual jets with non-circular orifice.
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ディダル , 瀬名波 出, 屋我 実, 親川 兼勇
原稿種別: 本文
セッションID: A224
発行日: 2005/11/02
公開日: 2017/06/19
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Experiments were carried out to measure the heat transfer from the surface fitted with short rectangular fin of different arrangement (co angular, zigzag, co rotating and co-counter rotating) in a rectangular duct. Thermal images were taken by an infrared camera and then analyzed the local heat transfer coefficients. Among different pattern of fin arrays co rotating is found to be most effective for heat transfer enhancement for smaller pitch ratio. Flow pattern was clarified by flow visualization in a water table and longitudinal vortices with others are observed.
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河村 隆雄, 渡邉 生
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セッションID: A231
発行日: 2005/11/02
公開日: 2017/06/19
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From the viewpoint of controllability of heat transfer, we investigated heat transfer characteristics on a flat plate facing to a rotating disk with a small gap, and the flow within the gap was directing toward the center of the disk (inward flow). At this configuration, it was expected that the heat transfer on the flat plate was strongly dependent on the friction drove directly by the disk. Some experiments were conducted at various flow rate and various rotation speed of the disk, and the results show superior heat transfer characteristics than that of outward flow case, i.e., the gap flow direct toward outer edge of the disk. The growing flow rate increases the heat transfer all over the heat transfer area under the disk, and the growing rotation speed augments the heat transfer rate near the outer edge of the disk, especially.
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深潟 康二, 岩本 薫, 笠木 伸英
原稿種別: 本文
セッションID: A232
発行日: 2005/11/02
公開日: 2017/06/19
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An attempt is made for simultaneous, but independent control of skin friction reduction and heat transfer enhancement in a turbulent channel flow. First, a mathematical relation is derived of the contribution of turbulent heat flux to the Nusselt number. Two different thermal boundary conditions are considered: (1) isothermal condition, where two walls are kept at constant, but different temperatures; (2) isoflux condition, where both walls are heated at a given wall heat flux. By focusing on the difference between the derived relation and the similar relation for the skin friction (Fukagata et al., 2002), a strategy for the simultaneous control is proposed. The effects of the control strategy are examined by means of direct numerical simulation.
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社河内 敏彦, 小川 寛和, 須崎 一郎, 佐竹 規彰, 辻本 公一, 安藤 俊剛
原稿種別: 本文
セッションID: A233
発行日: 2005/11/02
公開日: 2017/06/19
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Many researches used longitudinal vortex to enhance the heat transfer of heat exchanger focus on only the performance of fin plate surface. In this study, the effect of the vortex generators on the heat transfer characteristic on surface of tube was investigated experimentally. The measurement of heat transfer coefficient on the surface of tube and visualization of flow were conducted for three kinds of vortex generators. As a result, using the rectangular wing type vortex generator, the mean Nusselt number on the surface of tube increased about 28%, and using the rectangular winglet type vortex generator, the separation point of tube moved behind the tube by 38°. The generation of longitudinal vortex was seen, but a strong correlation with the heat transfer characteristic of the tube was not able to be confirmed.
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山岸 篤弘, 稲葉 武彦, 山口 康隆
原稿種別: 本文
セッションID: A234
発行日: 2005/11/02
公開日: 2017/06/19
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The steady laminar flow through multiple pipe bends, which form a coiled pipe with periodically changing the plane of curvature, is studied. The heat transfer is analyzed by calculating the temperature and velocity fields, and due to the changing of the plane of curvature, the size and angle of the twin vortices periodically change in multiple pipe bends. The mixing performance is evaluated as the length of the convolute line of the trajectories of points, local and mean Lyapunov exponents, and the fractal dimension of Poincare map.
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福井 政広, 鯉江 和俊, 井原 禎貴, 若井 和憲
原稿種別: 本文
セッションID: B211
発行日: 2005/11/02
公開日: 2017/06/19
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Droplet of water/oil type emulsified fuel was auto-ignited under high temperature and pressure condition provided by a rapid compression machine, and the combustion behavior was observed. Initial droplet diameter was varied from 70μ to 130μ, and ambient pressure was 1.8, 2.8, and 5.5MPa. The result showed the following. For emulsified fuel, under higher pressure than 1.8MPa, micro-explosion doesn't occur, but puffing occurs. Ignition delay of emulsified fuel droplet is longer than that of gas oil, and the effect of initial droplet diameter on ignition delay is high. Moreover, burning period of emulsified fuel is shorter than that of gas oil. At 5.5MPa that is simulated diesel engine condition, puffing phenomenon and auto-ignition of droplet occurs at the same time and flame shape changes randomly.
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長田 光広, 冬頭 孝之, 増田 糧, 植田 玲子, Reinhard TATSCHL
原稿種別: 本文
セッションID: B212
発行日: 2005/11/02
公開日: 2017/06/19
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The accuracy of emission models about both soot and NOx has been evaluated. Diesel engine simulation is conducted by coupling with the internal nozzle flow calculation in order to consider the cavitating effect. Three different EGR ratios, 12%, 14.5% and 17% are examined. Model parameters about both breakup and ignition models are adjusted to get better agreement with the experimental data of heat release rate. By solving the transport equations of both soot and NOx regarding the emission models, it is obtained that soot mass fraction increases in consequence of weakened oxidation effect whereas NOx mass fraction decreases as EGR rate increases.
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湯本 美樹, 柴田 恭志, 松下 徹也, 古谷 正広, 太田 安彦
原稿種別: 本文
セッションID: B213
発行日: 2005/11/02
公開日: 2017/06/19
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Self-ignition phenomena in shock tube are studied under the cool-flame dominant, negative-temperature-coefficient and blue-flame dominant temperature regimes. Two significant points were demonstrated in the previous paper. One was that the activation energy of methane mixture is low when the temperature behind reflected shock wave sets below 1500K. The other is that the self-ignition does not occur at the tube end in the lower temperature region. This paper describes low-temperature ignition of n-heptane mixture at an equivalence ratio φ=1.0. Almost the same ignition phenomena are established over the temperature ranging from low to high, including three temperature regimes appearing in the piston-compression ignition obtained in a rapid compression machine.
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鬼頭 俊介, 若井 和憲, 井原 禎貴
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セッションID: B214
発行日: 2005/11/02
公開日: 2017/06/19
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A jet ignition method by hydrogen flame jet is proposed to control the combustion of lean mixtures. Hydrogen flame jet is supplied from the cavity whose volume is less than one percent of the main chamber volume through the nozzle. It is worried that the heat loss of the jet ignition method becomes bigger than that of conventional ignition, because this method creates strong and high temperature flame jet. Especially at the nozzle, the heat flux might become bigger than other place. So the heat flux at the nozzle were measured and the relation between the jet velocity and heat flux were shown. The faster the flame jet is, the bigger the heat flux at the nozzle is. And the heat flux increases with the temperature of the jet. The maximum heat flux is proportional to the velocity and the temperature of the flame jet.
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野村 広哲, 濱田 啓佑, 新島 瞬, 西見 涼香, 武藤 拓也, 庄司 秀夫
原稿種別: 本文
セッションID: B221
発行日: 2005/11/02
公開日: 2017/06/19
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In this study, a spectroscopic method was used to measure the combustion characteri stics of a test diesel engine when operated on dimethyl ether (DME) under a homogenous charge compression ignition (HCCI) combustion process. The results of the analysis showed that the methane additive influenced the auto-ignition timing in the DME-HCCI combustion process. In the experiments, the addition of methane enabled the DME-HCCI engine to provide crankshaft output equivalent to that seen for diesel engine operation at a low equivalence ratio. This paper discusses these effects in reference to the experimental and calculated results.
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庄司 秀夫, 濱田 啓佑, 新島 瞬
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セッションID: B222
発行日: 2005/11/02
公開日: 2017/06/19
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Attention has recently been focused homogeneous charge compression ignition (HCCI) combustion as an effective combustion process for resolving the essential nature of combustion. Meanwhile, Dimethyl Ether (DME) has attracted interest as a potential alternative fuel for compression ignition engines. A diesel engine was used as the test engine. This paper discusses the influence of External EGR in HCCI combustion fueled with Dimethyl Ether based on experimental data.
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松永 靖弘, 渡邊 高志, 三浦 貴義, 吉田 幸司, 庄司 秀夫
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セッションID: B223
発行日: 2005/11/02
公開日: 2017/06/19
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The Homogeneous Charge Compression Ignition (HCCI) engine has attracted considerable interest in recent years as a new combustion concept for internal combustion engines. The HCCI engine has three major advantages: low fuel consumption, low carbon dioxide (CO_2) emissions and low nitrogen oxide (NO_X) emissions. However, the HCCI combustion process has four issues: ignition timing delay, slower combustion reaction speed (maximum heat release rate), difficulty in expanding stable operation to the high load region and avoidance of knocking. In this study, we used a primary reference fuel (40 RON) as the test fuel and tried to overcome these issues by applying internal and external exhaust gas recirculation (EGR). We varied the internal and external EGR rates and examined their respective influence on HCCI combustion.
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桑原 一成, 安東 弘光
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セッションID: B224
発行日: 2005/11/02
公開日: 2017/06/19
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An algorithm to extract essential species and elementary reactions from a chemical kinetics mechanism and reduce reaction networks in the mechanism had been proposed by one of the authors. According to a main part of the algorithm, reaction networks of low-temperature oxidation in a detailed mechanism of n-heptane were investigated in the present study. Essential reactions for production/consumption of OH and heat release were extracted on worksheets of the Microsoft Excel. It was concluded that thermal ignition is caused by H_2O_2(+M)→2OH(+M) lasting from the end of cool-flame reaction to the ignition, and the endothermic reaction can be driven by an exothermic reaction loop involving HCO, HO_2 and CH_2O.
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野村 佳洋, 清水 里欧
原稿種別: 本文
セッションID: B231
発行日: 2005/11/02
公開日: 2017/06/19
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The objective of this study is to investigate the structure and characteristics of premixed turbulent flames in SI engines for the validation and improvement of the numerical simulation. Fractal analysis with LIF technique was performed to analyze the flame of early stages in the cylinder, and the following results were obtained. 1) During the propagation, fractal dimension was almost constant. Only outer cutoff length was increased with flame radius. Therefore it seems that the increase of flame surface area is controlled by the flame own radius. 2) The flame surface area and laminar burning velocities were obtained from the fractal measurements and compared with those of conventional combustion model. Fairly good agreements were obtained.
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板谷 隆樹, 門脇 大輔, 庄司 秀夫
原稿種別: 本文
セッションID: B232
発行日: 2005/11/02
公開日: 2017/06/19
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Knocking is one phenomenon that can be cited as a factor impeding efforts to improve the efficiency of spark-ignition engines. With the aim of understanding knocking better, light emission spectroscopy was applied in this study to examine preflame reactions that can be observed prior to auto-ignition. Light emission intensity was measured at wavelengths of 306.4nm (characteristic spectrum of OH), 395.2nm (HCHO). In this research, preflame reaction when the ignition timing and the fuel were changed was measured for the generation phenomenon of the reaction.
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若井 和憲, 秦 小健, 井原 禎貴, 柴田 健太郎
原稿種別: 本文
セッションID: B233
発行日: 2005/11/02
公開日: 2017/06/19
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To study knocking phenomenon in stratified mixture condition, n-heptane /air mixture was fed into rapid compression machine (RCM) in a given concentration gradient. The auto-ignition took place by rapidly compressed mixture and the pressure history inside cylinder was measured. To separate the low frequency component from high one, the pressure trace was processed numerically by low and high frequency filter, and the ignition delay, the pressure increasing rate, the maximum pressure fluctuation and knocking intensity factor were defined and used to examine the knocking phenomenon. To simulate the auto-ignition phenomenon in the RCM a reduced mechanism of n-heptane oxidization reaction was employed. Both the experimental and numerical simulation results have the same tendency in the ignition delay and the pressure increasing rate.
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加藤 健次, 田川 正人, 太田 安彦
原稿種別: 本文
セッションID: C211
発行日: 2005/11/02
公開日: 2017/06/19
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To establish an appropriate compensation scheme for the response delay of commercially available temperature sensors, a reliable identification theory of the response characteristics of the temperature sensors and an accurate response compensation algorithm are necessary. In this study, a notable defect of the frequency-domain response compensation based on the fast Fourier transform (FFT), which can arise from the discontinuity between the both ends of a discrete time-series data, is rectified using a rotation-translation method during the digital signal processing.
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河村 隆雄, 伊藤 史哲
原稿種別: 本文
セッションID: C212
発行日: 2005/11/02
公開日: 2017/06/19
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Simultaneous measurement of flow temperature and flow velocity is expected to clarify the turbulent heat transfer phenomena. The traditional method for this situation is a combination use of the hot wire anemometer and the resistance thermometer, but this combination has a difficulty in measuring the flow velocity and temperature in the same position. So, a high-speed continuous and simultaneous method for measuring the flow temperature and velocity was developed using a single hot wire. The hot wire is heated alternatively by two electric current intensities with short intervals. In this research, the availability of this method was verified
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中村 元, 五十嵐 保
原稿種別: 本文
セッションID: C213
発行日: 2005/11/02
公開日: 2017/06/19
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A technique for the measurement of time-spatial characteristics of heat transfer to air has been developed using infrared thermograph. In this work, a thin platinum leaf of 0.15μm thick was employed as the test surface in order to improve the frequency response. Heat conduction analysis was performed to predict both the frequency response and the space resolution. The applicability of the platinum leaf was demonstrated by measuring the unsteady heat transfer on the wall of a turbulent boundary layer. The unsteady behavior caused by the streak structure formed in the near-wall region was clearly visualized.
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門出 政則, Peter Woodfield
原稿種別: 本文
セッションID: C214
発行日: 2005/11/02
公開日: 2017/06/19
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An inverse solution using Laplace transform can predict a given boundary condition well except for rapid change of the surface condition and moving heat source by introducing a time partition method. The time partition method has the ambiguity of how time is divided. A new method in which the inverse solution at a time, t, is obtained from the measured temperatures in the time range of [t-α(L^2/απ^2), t+α(L^2/απ^2)/2] becomes free from the complicated time division. In addition, for a moving source, a new interpolation is introduced by taking into account the temperature propagation along the moving source. The inverse solution, thereby can succeed in predicting the surface condition for any case commonly encountered. Quench cooling of high temperature, as an example of a moving source is effectively coped with.
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後藤 裕樹, 浅野 秀夫, 廣田 真史, 中山 浩, 平山 俊作
原稿種別: 本文
セッションID: C221
発行日: 2005/11/02
公開日: 2017/06/19
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Turbulent thermal mixing in rectangular channels with a T-junction was investigated experimentally, which simulated the mixing region in the automobile HVAC unit. The Reynolds number and temperature of the main-channel flow were 2.5×10^4 and 12℃, respectively, and the flow velocity in the branch (60℃) was set at the same value as that of the main channel. The simultaneous measurements of velocity and temperature were conducted using LDV and cold-wire thermometer to make clear the distribution of the turbulent heat flux with a special attention to its spanwise variation. The mechanism of the turbulent thermal mixing of hot and cold flows is discussed based on the distributions of the turbulent heat flux.
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三松 順治, 野村 昌弘, 渡辺 幹大
原稿種別: 本文
セッションID: C222
発行日: 2005/11/02
公開日: 2017/06/19
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The phenomena of the turbulent coherent structures and collapse of vortex are indispensable to realize high performance in heat transfer with a small pressure loss. Not only time-mean thermo- and fluid-dynamics but also unsteady and sequential 3D-phenomena are very important to study and control these phenomena in engineering applications. The most percentage of heat transfer enhancement were given birth for very short time period, when the turbulent structure just come and make effect on the heat transfer field near wall. But the time-dependent correlations between unsteady fluid and heat transfer fields are still unknown, which are most interesting and exciting to investigate experimentally. In this study, the three-dimensional velocity measurement system would be improved with multi-color field by the illumination optics for liquid crystal projectors and image processing for the detection of 3-D velocity vector. The unsteady collapse processes of periodic vortex by plate are investigated near wall region on the plane, and are shown by graphic figures.
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三松 順治, 中川 大輔, 中村 充良, 檜和田 宗彦
原稿種別: 本文
セッションID: C223
発行日: 2005/11/02
公開日: 2017/06/19
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For making clear the phenomena on the unsteady heat transfer with liquid film in two phase flow, the measurements are needed about unsteady film thickness and velocity profiles in the liquid film adding time-averaged values. It would be very important especially to estimate the dry out mechanism of liquid film experimentally on fuel rod around the spacer in the new fuel assembly of BWR. In this study, the unsteady velocity profiles would be estimated by the surface and flow velocity profiles, which were detected experimentally by the tracking of the visualizing particles with image processing. Measurement of film thickness is conducted to multi-points resistance probe to measure liquid film thickness profile in flow single channel. Flow rate is calculated unifying these two. As a result, it turned out that flow rate decreased immediately before spacer.
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吉本 雅則, 丸山 直樹, 松井 弘和, 加藤 征三
原稿種別: 本文
セッションID: C224
発行日: 2005/11/02
公開日: 2017/06/19
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The object of this study is to evaluate the heat transfer characteristics in low-density environments, where the pressure is given between high vacuum region and atmospheric pressure. In this study, a natural convection, affects the field of production of thin films, is analyzed by experiment using holographic interferometry. In addition, by comparing the results of the experiments, the effectiveness of numerical calculation is tested of low-density environments. After that, the various conditions are analyzed by numerical calculation instead of experiment. Finally, the characteristics of heat transfer are evaluated by two kinds of analyses.
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高 翔平, 店橋 護, 宮内 敏雄
原稿種別: 本文
セッションID: C231
発行日: 2005/11/02
公開日: 2017/06/19
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CH double-pulsed planar laser induced fluorescence (PLIF) measurements have been developed to investigate dynamics of flame elements in turbulent premixed flames. The CH-DPPLIF measurements, which are the direct measurements of displacement speed of the flame fronts, were conducted in relatively high Reynolds number turbulent premixed flames on a swirl-stabilized combustor. By selecting appropriate time interval of successive CH PLIF, movement of the flame front was captured clearly. In addition, by applying cross-correlation method for successive CH images obtained with minute time interval, displacement speed of the local flame element is measured, where the flame front is determined from mixed-average of CH fluorescence intensity in corresponding interrogation regions. Local flame displacement speed is of the order of u'_<rms> and probability density functions coincide very well for all Reynolds number cases under the normalization by u'_<rms>
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伊藤 大介, 木倉 宏成, 有冨 正憲
原稿種別: 本文
セッションID: C232
発行日: 2005/11/02
公開日: 2017/06/19
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This paper presents the fundamental study of a novel measurement method using ultrasonic echo signals on boiling two-phase flow. The method has the capability of measuring an instantaneous echo intensity profile along an ultrasonic beam, so it is expected to apply on pattern recognition of two-phase flow. The principle of the flow pattern recognition is based on delay time and strength of a pulse echo. In this paper, echo signals reflected on a boundary between water and vapor, were obtained using an ultrasound system, and estimated the effects of boiling phenomena.
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安部 裕一, 阿部 豊, 綾 威雄, 山根 健次
原稿種別: 本文
セッションID: C233
発行日: 2005/11/02
公開日: 2017/06/19
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The technology of the deep-ocean CO_2 storage under favor of CO_2 hydrate is expected directly to mitigate the global warming. There are several property data of CO_2 hydrate, but the data of the membrane thickness under a variety of parameter conditions such as pressure and temperature is lacked. The measurements of the CO_2 hydrate membrane thickness are conducted by the laser-light interference method. From the results of picture obtained, the interference-induced stripes are well measured at pressure conditions of 6MPa, 8MPa, 10MPa and the temperature condition of about 276K. And the graphics was analyzed, and the thickness of the film is estimated.
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森 陽彦, 中山 英之, 久木田 豊, 伊藤 高啓
原稿種別: 本文
セッションID: C234
発行日: 2005/11/02
公開日: 2017/06/19
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Forced vertical vibration of an immiscible liquid-liquid interface, enclosed by a stationary cylindrical wall, can induce a non-zero time-averaged flow, or streaming, leading to a large-scale re-circulating flow when the fluids are driven nearly at the natural frequency of the axisymmetric inter face wave. In this study we extracted time-averaged component in the flow by obtaining phase-averaged velocities. The mechanisms responsible for the streaming phenomenon are investigated by measuring the response of the interface wave and streaming to excitation at variable amplitude and frequency, and by measuring the streaming velocities using the particle image velocimetry (PIV) method.
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加藤 和也, 丸山 直樹, 巽 高洋, 加藤 征三
原稿種別: 本文
セッションID: C235
発行日: 2005/11/02
公開日: 2017/06/19
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Gas and liquid two phase flow in narrow and parallel plate is investigated by experiment and numerical simulation. The experiment is performed in batch and fluid type, where the gas is generated during the experiment by chemical reactions. The purpose of this paper is to create the chlorination water considering from the standpoint of high concentration and high efficiency. These result will be applied to create the chlorination water called hypochlorous acid with high efficiency.
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中山 顕
原稿種別: 本文
セッションID: D211
発行日: 2005/11/02
公開日: 2017/06/19
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The recent developments associated with modeling flow and heat transfer in porous media are reviewed in this note. The non-Darcy terms such as Forchheimer and Brinkman terms are examined for their validity and corresponding limiting conditions. Available models for estimating the thermal dispersion are discussed referring to the dispersion flux transport equation. The correlations for the interfacial heat transfer coefficient are presented, which are required for modeling non-thermal equilibrium cases. Moreover, one of controversial issues associated with flows in porous media, namely, the use of the time-space averaging order for modeling turbulence in porous media, is revisited in this review. The LES results reported recently are examined to elucidate the turbulent phenomena in porous media. The LES study reveals that Ergun's equation may well describe the drag relationship for the turbulent flow in porous media. Furthermore, it suggests that turbulence may appear in porous media at comparatively low Reynolds number.
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桑原 不二朗, 本山 英明, 中山 顕
原稿種別: 本文
セッションID: D212
発行日: 2005/11/02
公開日: 2017/06/19
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A flow around a square rod made of porous medium was investigated exploiting a flow visualization technique. A numerical simulation was also conducted using a general set of the modified Navier-Stokes equations proposed by Vafai and Tien. It is found that the fluids penetrating into the porous rod from the front face are diverted towards two inner side faces. They blow out from the side faces, modifying the external flow field around the rod.
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今井 悟, 足立 高弘
原稿種別: 本文
セッションID: D213
発行日: 2005/11/02
公開日: 2017/06/19
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We have performed three-dimensional linear stability analyses for natural convection in concentric annuli with porous media. A constant heat flux is given at the inner cylinder, while the outer cylinder surface is maintained a constant temperature. We calculate the critical Rayleigh numbers when the basic two-dimensional flow becomes unstable with respect to three-dimensional disturbances. Additionally, we measure a local Nusselt Number to examine the heat transfer characteristics when we put both water and porous media in the gap of two concentric cylinders. In addition, we compare the convection flow patterns obtained from visualization with the results from stability analyses.
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