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Changsuwan Pattraporn, 井上 修平, 井上 陽仁, 川井 良文, 野口 琢史, 谷川 博昭, 松村 幸彦
セッションID: F225
発行日: 2016年
公開日: 2017/06/19
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フリー
This paper describes the gasification characteristics of shochu residue solid particles. Shochu residue is composed of liquid phase and solid phase. Gasification characteristics of each component should be important to understand the supercritical water gasification of shochu residue. However, so far gasification characteristics of only shochu residue solid component has not been reported. In this study, solid component was separated from the shochu residue, and its gasification efficiency was determined experimentally.
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(作動流体の影響)
三浦 正義, 長崎 孝夫, 伊藤 優
セッションID: F231
発行日: 2016年
公開日: 2017/06/19
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フリー
Heat transport characteristics with a liquid column oscillation in a straight channel with square cross section have been investigated experimentally. The working fluid was charged to form the liquid column after the channel was evacuated, which is called single-component system. In addition, the working fluid was charged in the channel with air in the gas phase at atmospheric pressure, which is called two-component system. The heat transport characteristics in the single-component and two-component system were evaluated in FC-72, ethanol and water. The effects of the working fluids on the heat transport characteristics are discussed.
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星 洋輔, 亀山 将太郎, 山田 崇, 小野 直樹
セッションID: F232
発行日: 2016年
公開日: 2017/06/19
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フリー
A new hybrid cooling system with the combination of heat pipes and phase change material for the lithium-ion battery in electric vehicles is being developed in our laboratory. It is also necessary to investigate the performance of the heat pipe for the development of this hybrid cooling technology. In this study, we investigated dry-out of heat pipe by measuring internal pressure and internal temperature. In addition, we observed the vapor phase inside this heat pipe by high speed camera and measured flow velocity by PIV (Particle Image Velocimetry) technique.
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大谷 浩輔, 上田 洋佑, 西川原 理仁, 柳田 秀記
セッションID: F233
発行日: 2016年
公開日: 2017/06/19
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フリー
Recently, loop heat pipe (LHP) has been attracting attention as a thermal control device. It is necessary to establish of a design method of LHP evaporator based on vapor-liquid transport phenomenon. In this study, to visualize the phenomenon in the evaporator at high heat fluxes, a LHP with the maximum heat flux of 20 W/cm2 is designed and fabricated using a glass tube evaporator. The LHP can operate regularly and vapor phase expands in the groove by evaporation.
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小林 大樹, 孫 健, 井上 剛良
セッションID: F234
発行日: 2016年
公開日: 2017/06/19
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フリー
Heat transport performance of a high-temperature OHP was studied experimentally in considering an application to a thermal protection system for reentry vehicles or hypersonic aircrafts. A two-turn OHP of an inner diameter of 3 mm was made of Incoloy 800HT and sodium of 3.1 g was charged in it. From the experiments, a heat transport rate of 318 W was obtained between the heating section of 1000 °C and the heat dissipating section of 817 °C. At the conditions, the temperature of OHP surface in the heating section was decreased by 41 °C.
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田中 賢也, 浅田 雅裕, 朝熊 裕介, Chi Phan
セッションID: G111
発行日: 2016年
公開日: 2017/06/19
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フリー
Surface tension of any fluid is crucial for multiphase systems and is often manipulated during industrial processes by introducing surfactants. Normally, water used in an industry includes impurity such as salt. In this study, effect of sodium chloride concentrations, microwave power and time on surface tension of aqueous solution was investigated under microwave irradiation. It has found that surface tension decreased quickly, while temperature increased during microwave. Once the radiation is turned off, the temperature returns rapidly as expected. However, surface tension recovery was much slower than temperature. Moreover, the recovery and reduction amounts by non-thermal effect depend on the power and concentrations.
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影山 拓也, 吉田 周平, 曽根 宏隆, 田中 学, 渡辺 隆行
セッションID: G112
発行日: 2016年
公開日: 2017/06/19
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フリー
The purpose of this study is to synthesize lithium transition-metal oxide nanoparticles by induction thermal plasmas. Six different systems of Li-Mn, Li-Cr, Li-Fe, Li-Co, Li-Ti, and Li-Ni were compared to understand the formation mechanism. The obtained results indicated that lithium metal oxide nanoparticles were successfully synthesized in Li-Mn, Li-Cr, Li-Fe, Li-Co, and Li-Ti systems, while those nanoparticles were rarely synthesized in Li-Ni system. This difference was discussed on the basis of thermodynamic consideration. The yield of prepared lithium metal oxides depends on the ratio of Gibbs free energy change of lithium transition-metal oxides to that of metal oxides.
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縄田 祐志, 田中 学, 今辻 智幸, 橋詰 太郎, 渡辺 隆行
セッションID: G113
発行日: 2016年
公開日: 2017/06/19
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フリー
The purpose of this study is to investigate the formation mechanism of aluminum oxide nanoparticles in thermal plasma. A multiphase AC arc was utilized as thermal plasma source to synthesize oxide nanoparticles. Dynamic behavior of the metal oxide vapor which is a precursor of oxide nanoparticles was successfully visualized by high-speed camera with appropriate band-pass filter system. According to spectroscopic measurements, transmission wavelength of band-pass filters were selected to be 670 nm for Al atomic line and 514.5 nm for AlO molecular spectra, respectively. The obtained results indicated that Al vapor was distributed in only upstream of plasma tail while AlO vapor was generated in downstream. These results experimentally elucidated that Al oxide nucleates at first and then Al oxide condenses to form Al2O3 nanoparticles.
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豊田 洋通, 朱 霞, 加藤 吉成, 芝野 優, 長岡 謙, 野村 信福, 岩本 幸治, 向笠 忍
セッションID: G114
発行日: 2016年
公開日: 2017/06/19
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フリー
In this study, the synthesis of single-wall carbon nanotubes (SWCNT) using in-liquid CVD method is attempted. Si substrate on which Co micro particles are deposited as the catalyst is used. Electrical resistance heating method is used for glowing carbon nanotubes in pure ethanol. The synthesized materials are analyzed by scanning electron microscope, transmission electron microscope and Raman spectroscopy. As a result, the synthesis of SWCNT was successful on a wide area of the substrate surface. By investigating the synthesized carbon nanotubes changing experimental conditions such as pressure, substrate surface roughness and others, it is cleared that surface roughness of the substrate and the bubble behavior are related to the synthetic mechanism of carbon nanotubes.
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野崎 智洋, 亀島 晟吾, 山崎 匠, MOONMUANG Tinnapop
セッションID: G121
発行日: 2016年
公開日: 2017/06/19
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フリー
Dry methane reforming in dielectric barrier discharge and catalyst hybrid reactor was investigated. Optical emission spectroscopy was employed for better understanding of reaction mechanism for enhanced CH4 and CO2 conversion as well as carbon removal reaction. Strong emission from C2 molecules, which is known as C2 high pressure Swan system, was observed when CO2 + “C(ad) or NiC” = CO + CO becomes dominant reaction. C2 molecules were rather selectively produced via vibrationally excited CO. Because CO is produced from adsorbed carbon or nickel carbide, emission from C2 high pressure Swan system becomes a good indication of surface reaction enhancement. Time dependent change of gas composition and emission profiles of CO and C2 were correlated and detailed reaction pathways is proposed.
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野村 信福, 丹下 和樹, Fadhli Syahrial, 北原 拓磨, 向笠 忍, 豊田 洋通
セッションID: G122
発行日: 2016年
公開日: 2017/06/19
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フリー
The decomposition of cellulose suspension for hydrogen production by using a 27.12MHz in-liquid plasma is carried out at atmospheric pressure. Various types of electrolyte, such as 1 mol/dm3 H2SO4, 1 mol/dm3 NaOH and 0.333 mol/dm3 Na2SO4, are used and the gas production rate are compared. An employing 1 mol/dm3 NaOH for decomposition process indicated that the gas production rate was 7 times higher than that of decomposition of cellulose in pure water. When cellulose content is 20 wt%, the hydrogen ratio in the produced gas is approximately 60%. EPR (energy payback ratio) in which measured for economical production of hydrogen is the highest When 1 mol/dm3 NaOH is used as an electrolyte for decomposition process.
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大塚 和彦, 野村 信福, 向笠 忍, 豊田 洋通, Muhammad Agung
セッションID: G123
発行日: 2016年
公開日: 2017/06/19
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フリー
This research investigates the direct phenol production from toluene by dielectric-barrier discharge (DBD) plasma in a mixture gas of argon and water vapor. Two kinds of experiment were conducted. The first experiment was by irradiating the surface of liquid toluene with DBD plasma jet, and the second one was by generating DBD plasma in a bottle of toluene into which the mixture gas was flowing. The maximum phenol yields at the first and second experiment were 0.8×10-3% and 3.2×10-3%, respectively. The phenol yield at the first experiment increased with decrease of input power for the DBD. The phenol yield at the second experiment took the maximum when the water for making the mixture gas by bubbling was the room temperature.
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松尾 剛志, 小関 悠太郎, 田中 学, 渡辺 隆行
セッションID: G124
発行日: 2016年
公開日: 2017/06/19
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フリー
A water plasma was generated by DC arc discharge between a hafnium cathode and a cupper anode. Arc fluctuation in the water plasma was examined by arc image observation synchronized with voltage measurement. Axial and radial extent of the arc was observed by high-speed camera. The effect of anode nozzle length was investigated to control the arc fluctuation. Radial extent of arc was suppressed when anode nozzle length increased. Therefore, available arc energy was increased when anode nozzle length was more than 7 mm. Decomposition rate of the treated material can be improved by arc control.
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田中 学, 佐賀 弘基, 橋詰 太郎, 松浦 次雄, 渡辺 隆行
セッションID: G125
発行日: 2016年
公開日: 2017/06/19
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フリー
The purpose of this study is to establish a multiphase AC arc (MPA) system for nanomaterial fabrication without electrode erosion issues. An innovative method to generate MPA with diode rectification was proposed to solve electrode erosion. Multi-diodes were placed between the electrodes and the transformer. Then, the electrodes were divided into pairs of W cathode and Cu anode. The electrode erosion rate in diode-rectified MPA was less than one-third of that in conventional MPA. The high-speed imaging of the electrode region revealed that the electrode temperature was successfully decreased in diode-rectified MPA due to its polarity characteristics. Moreover, the high-speed imaging of arc phenomena suggested that the stable arc discharge was successfully generated in diode-rectified MPA. Obtained results indicated that the diode-rectified MPA enabled us to establish nanomaterial fabrication process at high-productivity.
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原田 智, 菊川 豪太, 小原 拓
セッションID: G131
発行日: 2016年
公開日: 2017/06/19
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フリー
It is of great importance to predict thermophysical properties of thermal medium liquids by comprehending the mechanism for momentum transfer at the molecular scale and elucidating microscopic building blocks of viscosity. It allows us to design molecules which have necessary thermophysical properties. Viscosity is one of significant properties which determine performance of heat exchangers. In this study we aim to understand how the liquid viscosity is determined by molecular interactions and investigate the influences on viscosity by molecular species, shear rate and temperature, by separating viscosity into detailed molecular scale mechanisms to transport momentum using NEMD (non-equilibrium molecular dynamics) simulations. Here we adopted argon, water and alkane species as tested liquids to understand the momentum transfer mechanisms in fundamental liquids.
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伊森 大記, 植木 祥高, 芝原 正彦
セッションID: G132
発行日: 2016年
公開日: 2017/06/19
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フリー
Evaporation of a mixture droplet of argon and xenon were directly simulated by the classical molecular dynamics simulations. The effects of mixture component, on evaporation process and evaporation rate, were investigated. The potential energy between the argon molecules and the xenon molecules is assumed to be the 12-6 Lennard-Jones form. The results showed that the initial heating period of a droplet was reduced with the increase of mixed xenon molecules. On the other hand, the evaporation rate was not influenced by the increase of the mixed xenon molecules under the present calculation conditions.
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橋本 敏生, 有馬 博史, 足立 高弘
セッションID: G133
発行日: 2016年
公開日: 2017/06/19
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フリー
To clarify the boiling behavior inside plate evaporator, we developed a simulation code of vapor-liquid twophase flow. The simulation code was adopted CLSVOF method combining the LS method and the VOF method. Assuming a plate-type evaporator flowing FC-72 as a working fluid, the calculation model is two-dimensional rectangular channel which is 2mm long and 1mm wide. The calculation was executed at different mass flux and heat flux conditions. As the result of calculation at different simulation conditions, the different boiling behavior and the different heat transfer coefficient were derived.
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有馬 博史, 小山 幸平, 中村 友哉, 栗田 陸也
セッションID: G134
発行日: 2016年
公開日: 2017/06/19
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フリー
The OTEC system requires the more efficiency heat exchangers to improve the efficiency of own system. To improve the heat transfer performance of it, we studied the heat transfer surface of plate evaporator with micro-fabrication in the past. The plate had good heat transfer performance. Then, we proposed the new type evaporator which has U-type fins. In this study, the overall heat transfer coefficient was measured and FC-72 boiling behavior inside evaporator was observed. The result of that the U-type fins plate has about 60% larger overall heat transfer coefficient than without fin plate at the same flow conditions.
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仙波 瑞妃, 田辺 信行, 河南 治, 松廣 和樹, 本田 逸郎
セッションID: G135
発行日: 2016年
公開日: 2017/06/19
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フリー
Recently, boiling heat transfer can be used in cooling system. There are some issues in this system such as decreasing of onset of nucleate boiling temperature, increasing of heat transfers on the low heating surface temperature and critical heat flux. To solve them, boiling heat transfer by immiscible liquids is applied. In this study, pool boiling experiments by using water/FC-72 immiscible liquids are performed in a glass vessel, which has a heating surface of 25 mm diameter. In this experiment, mixture volume ratio from the heating surface to water surface is varied in Water:FC-72 = 10:0, 9.5:0.5, 9:1. When this ratio is 9.5:0.5, highest heat transfer coefficients and maximum heat flux are observed.
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山口 智史, 皆見 貴幸, 佐藤 洋平
セッションID: G211
発行日: 2016年
公開日: 2017/06/19
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フリー
A non-intrusive concentration measurement system using P-CARS (Polarization-Coherent Anti-Stokes Raman Scattering) technique was developed to investigate the ion motion in mixed electrolyte solutions. P-CARS technique has an ability to separate CARS light from non-resonant background noise, which is characteristic of the measurement based on CARS, by their polarization directions. In this paper, calibration experiments were conducted in order to confirm the ability of the P-CARS technique. The results of these experiments showed that P-CARS technique has an ion concentration resolution with 5 mmol/L order.
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渡邉 菖平, 漆谷 真帆, Hadji Céline, Virot Leopold, Icard Béatrice, Agache Vinc ...
セッションID: G212
発行日: 2016年
公開日: 2017/06/19
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フリー
The purpose of this study is to develop a measurement system for gold nanoparticle concentration using Evanescent for a Chip (EvaChip). Evanescent wave generated using an EvaChip is capable of illuminating the vicinity of an interface easily. The scattered light intensity of gold nanoparticles is very large, therefore it is possible to count the number of gold nanoparticles by binarization and labeling. In this experiment, calibration curves showing the relationship between the number and concentration of particles were gained. The measurements were conducted under the condition of static and dynamic fields. The results showed that the number of particles were proportional to the concentration. Using this relationship, it is possible to measure gold nanoparticles concentration in microdevice.
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木下 進一, 吉田 篤正
セッションID: G213
発行日: 2016年
公開日: 2017/06/19
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フリー
Recently, heat island phenomenon becomes remarkable with expansion of the urban area. So far it is refrained because the adaptation to the wall surface of highly reflective materials leads to aggravation of the thermal comfort of the street space. In order to decrease the heat load from a wall surface to the atmosphere and mitigate the effect of solar reflection to street space, it is necessary not only to raise the reflectance on the wall surface but also to apply the materials with retroreflection property that can reflect the sunlight in the incidence direction. In this study, it is assumed that retroreflective wall materials is constructed for a wall surface, and the thermal influence to human body near the wall surface affected by solar reflection characteristics, especially reflection directivity is numerically evaluated.
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木下 晴貴, 木下 正治, 湯原 大輔, 山本 憲, 泰岡 顕治, 佐藤 洋平, 菱田 公一
セッションID: G214
発行日: 2016年
公開日: 2017/06/19
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フリー
The experiment has been carried out on investigation of thermofluid phenomena in the vicinity of interface by combining nanoscale laser measurement and the molecular dynamics. In this paper, concentration distributions were investigated for evaluating the influence of hydrophilicity/hydrophobicity on molecular diffusion in the vicinity of liquid-solid interface. Imaging of the concentration distributions was achieved by detecting the Raman scattering excited by the evanescent wave generated at liquid-solid interface. In the calibration, it was confirmed that the linear relationship between the concentration and intensity of Raman scattering was obtained.
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千阪 秀幸, 中川 二彦
セッションID: G215
発行日: 2016年
公開日: 2017/06/19
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フリー
The SMART factory project which involves building a plastic production system from wood biomass (thinned wood) at Maniwa biomass base has been developed. This development aims to construct a business utilization model that increases the production of wood biomass. One of the issues is the economical reduction of CO2 emissions which are produced by the consumption of electric power and fossil fuel while the biomass in the factory is processed. In this study, a smart energy system for industry which combines solar power with electric industrial vehicles is developed through the use of a mathematical model and some practical experiments. The results confirm that this smart system is able to reduce CO2 emissions by more than 40% economically.
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友部 勝文, 飯島 崇, 山本 詠士, Dusan Kojic, Roumiana Tsenkova, 安井 正人, 泰岡 顕治
セッションID: G221
発行日: 2016年
公開日: 2017/06/19
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フリー
Carbohydrate is one of the most abundant biological molecules on the earth. Monosaccharide is the minimal unit of all carbohydrates; thus knowledge of monosaccharide is useful for other sugar complexes. In human body, most of monosaccharide solvate in water. Therefore, the molecular behavior of monosaccharide and water molecules in hydration shell is important for thermophysical properties of monosaccharide solutions. Here, we performed molecular dynamics simulations of monosaccharide solutions at different temperatures, concentrations and monosaccharide species to investigate the effect of the differences. Using spatial distribution functions, we successfully visualized the differences of hydrations shell around monosaccharide affected by these differences.
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陳 林, 神田 雄貴, 山田 光, 岡島 淳之介, 小宮 敦樹, 円山 重直
セッションID: G222
発行日: 2016年
公開日: 2017/06/19
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フリー
As one of the most promising energy resources for humankind, methane hydrate has become an eye-catching topic in engineering research. In this study, low emission model for methane hydrate extraction is proposed from the seabed and power generation with CO2 Sequestration process. The focus of this design and analysis is to increase the heat and mass transportation process under the seabed. Depressurization method is combined with hot water warm-up process in the newly proposed system. The heating up of methane hydrate layer and fracturing increases the heat mass transfer. Then the methane hydrate production can be increased.
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比嘉 正樹, 瀬名波 出, 松田 昇一, 安田 啓太
セッションID: G223
発行日: 2016年
公開日: 2017/06/19
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フリー
Heat transfer experiments were conducted to clarify the effect of combined heat transfer enhancement in the downstream region of a backward- facing step by means of a small amount of mist and insertion of a circular rod. The rod in the duct was located in four kinds of vertical position. In the results of the heat transfer experiment, a large effect of heat transfer enhancement was obtained at the case of a rod position was equal to step height.
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平塚 将起, 大村 亮, 泰岡 顕治
セッションID: G224
発行日: 2016年
公開日: 2017/06/19
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フリー
The ionic semiclathrate hydrates are inclusion compounds consisting of water forming cages and the ionic molecules enclosed in the cages as guest substance. The stability and structures of the semiclathrate hydrates are closely linked with the guest-host ionic interactions in the cages. In this study molecular dynamics simulation using Car-Parrinello method were performed on the TBAB semiclathrate hydrates and analyzed the distributions, vibrational spectra, motions of the guest molecules in the cages. The proton coordinates of the hydrates were determined to be satisfying the ice rule of the semiclathrate hydrates. The calculation showed the effect of the anions in the framework of the semiclathrate hydrate and the interactions between ionic guest-host molecules.
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阪中 郁哉, 角木 亮介, 栗山 怜子, 巽 和也, 中部 主敬
セッションID: G225
発行日: 2016年
公開日: 2017/06/19
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フリー
The authors are aiming at controlling actively the heat transfer performance in low Reynolds number flow with photo-rheological fluids (PRFs) whose rheological properties can be tuned by UV irradiation. We examine the flow structures of UV-irradiated and non-irradiated PRFs in a serpentine channel by PIV, and investigate the correlation between the flow behaviors and the heat transfer rate. As a result of the experiment, UV-irradiated PRF flow becomes almost symmetric to the center of the channel and steady, while non-irradiated PRF flow has flow distortion and unsteadiness. This may lead to change the heat transfer characteristics.
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三宅 啓史, 山本 誠, 福島 直哉, 守 裕也, 原 潤一郎, 岩崎 充, 松平 範光
セッションID: G231
発行日: 2016年
公開日: 2017/06/19
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フリー
In high thermal gradient environment, nano particles often adhere on wall surfaces of fluid machinery due to thermophoresis effects, which results in energy loss. Its deposition mechanism has not been clarified yet. In this study, we perform numerical simulations of a rectangular duct flow with a flat plate to investigate nano-particle motion and its deposition phenomenon. The Euler-Lagrange coupling method is employed to reproduce interaction between particles and the flow field. The results show that the thermophoresis dominates nano-particle motion and the deposition layer forms around the flat plate on the low temperature wall of the duct. Due to the adiabatic deposition layer, however, the thermophoresis effect decreases.
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土倉 慎太郎, 田川 俊夫
セッションID: G232
発行日: 2016年
公開日: 2017/06/19
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フリー
Induction-type electromagnetic pump was numerically studied for annular tubes. The conducting fluid (molten sodium) as a coolant is assumed to be incompressible and Newtonian fluid. The present study focuses on how the flow is driven by the applied moving magnetic field but it does not focus on the heat transfer. The effect of induced magnetic field, which may be related to the flow instability of the induction pump, is taken into account by solving the induction equations using the cross-helicity method. The computations include various dimensionless parameters such as Reynolds number based on the phase velocity, Hartmann number, magnetic Reynolds number and so on. Several demonstrations changing the radius ratio and wavenumber were numerically evaluated.
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山田 悠嗣, 川越 晶太, 中倉 満帆, 松原 幸治
セッションID: G233
発行日: 2016年
公開日: 2017/06/19
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フリー
There has been growing interest on renewable energy because of the recent environmental and energy problems. Among them, solar thermal and biomass can be applied to the existing gas turbine cycle as good options to solve current problems. In the EFGT (externally fired gas turbine) cycle, one of the key components is heat exchanger, and improving its heat resistance is an essential issue. This paper proposes the model of Spiral Heat Collector, which comprises of ceramic heat exchanger and combustor parts, and shows the result of the numerical analysis. Then we evaluate performance index such as heat transfer and temperature effectiveness.
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大塚 慶彦, 田川 俊夫
セッションID: G234
発行日: 2016年
公開日: 2017/06/19
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フリー
The purpose of this study is to elucidate the fundamentals of geomagnetism creation of the Earth. For this, we assume a simplified model for numerical computations. The present study considers the interaction between the magnetic field and thermal convection for an incompressible viscous fluid in a rotating spherical shell. For certain combination of parameters, ideal convection structure, which rotates at a constant speed with keeping the fluid and temperature fields, is attained and it may generate magnetic field which grows exponetially during the early stage and finally tends to reach to quasi constant value. It is exhinited that the growth rate of the magnetic field depends on the magnetic Prandtl number.
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鈴木 雄二
セッションID: H111
発行日: 2016年
公開日: 2017/06/19
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フリー
Unlike low-cost massive energy sources for grid systems, energy harvesting is a high-addedvalue power generation technology, in which small power can be extracted from energy sources in the environment. Energy harvesting technologies will make an important contribution to autonomous devices including wireless sensor nodes by providing battery-less long-lived power source. Recently, significant efforts have been paid in the country and abroad toward various applications such as building energy management system. Role of thermal engineering in the energy harvesting area is discussed.
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宮崎 康次
セッションID: H112
発行日: 2016年
公開日: 2017/06/19
会議録・要旨集
フリー
The studies on micro thermoelectric generators are reviewed in the present paper. The configuration of the devices is introduced for understanding the mechanism of thermoelectric generators. The fabrication processes and the output power of the micro thermoelectric generators are discussed. The developed micro-generator for wrist watch was made by mechanical machining in 1999, but the recent micro-generator was made by standard micro-fabrication processes, such as thin film deposition, etching, wafer bonding etc. The production costs will be also important for practical use of a thermoelectric micro-generator.
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野村 政宏, 中川 純貴, 澤野 憲太郎
セッションID: H113
発行日: 2016年
公開日: 2017/06/19
会議録・要旨集
フリー
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池田 浩也, 和波 雅也, 太田 裕也, 坂本 翔太, 鈴木 悠平, ベルスワミィ パンディヤラサン, ファイズ サレ, マニ ナヴァニーザ ...
セッションID: H114
発行日: 2016年
公開日: 2017/06/19
会議録・要旨集
フリー
For high-efficiency wearable power generator, we have investigated the ZnO nanostructures grown on cotton fabric (CF) as a novel flexible thermoelectric material. We have fabricated ZnO nanostructures on CF by two-step growth method consisting of a seed creation process and a nanostructure growth process. It has been confirmed from ultraviolet transmittance spectra that the ZnO nanostructures are strongly fixed on the CF even after laundering them ten times. In the present study, ZnO nanopillar-nanosheet composites were formed on CF by the two-step growth method. By means of an ac calorimetric method, the thermal diffusivity of the ZnO nanostructure/CF sample was evaluated to be 1.4x10-4m2/s.
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野村 政宏, Jeremie Maire, Oliver Paul
セッションID: H121
発行日: 2016年
公開日: 2017/06/19
会議録・要旨集
フリー
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宮崎 康次, 濱 翔太, 矢吹 智英
セッションID: H122
発行日: 2016年
公開日: 2017/06/19
会議録・要旨集
フリー
In this study, we fabricated an in-plane thermoelectric micro-generator using free-standing film prepared by standard micro-fabrication processes. We fabricated a SiNx free-standing film substrate about 5 μm thick on Si wafer, and both p and n type of bismuth telluride thermoelectric thin films by using a coaxial type vacuum arc evaporation method. The thermoelectric films were annealed for one hour at 573 K to improve the film properties. A shadow mask was used for the patterning of the generator. Temperature difference of 22.3 K was measured in the generator due to its high thermal resistance at 373 K heating. The exergy of the thermoelectric device is up to 7 %. Therefore, the generator converted about 0.4 % of thermal energy into electric energy, even though the material performance is low with ZT = 0.28. The conversion efficiency is much higher than that of the conventional Π type thermoelectric module. It was possible to get higher performance by the thermal design, which is a more simple way than an improvement of ZT.
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謝 鴻, 森本 賢⼀, 鈴⽊ 雄⼆
セッションID: H123
発行日: 2016年
公開日: 2017/06/19
会議録・要旨集
フリー
In the present study, we propose an electret-based unsteady thermal energy harvester using potassium tantalate niobate (KTa1-xNbxO3, KTN) as a dielectric for the capacitor. By connecting in series the capacitor and an electret serving as a permanent voltage source, the capacitance change with temperature fluctuations alters the amount of induced charges thereby produces external current. By using KTN having extremelylarge temperature coefficient of permittivity together with CYTOP electret, output power of 572 nJ has been obtained from one heating cycle, which corresponds to 20 times higher output power than the previous result with BaTiO3.
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植谷 健介, 諸橋 憲一郎, 浅岡 龍徳
セッションID: H124
発行日: 2016年
公開日: 2017/06/19
会議録・要旨集
フリー
This study proposes a spectrum splitting type hybrid photovoltaic/thermal collector system as a method of suppressing an increase in the temperature of the solar cell to improve power generation efficiency. Infrared radiation, which does not contribute to the power generation in the solar cell, is separated from the solar light before irradiated to the solar cell, and used for the power generation by heat engine. It was shown by experiment and numerical calculation that the power generation efficiency of the system can be improved by the effect of the decrease in temperature of solar cell.
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陸 嘉, 趙 恒竣, 鈴木 雄二
セッションID: H125
発行日: 2016年
公開日: 2017/06/19
会議録・要旨集
フリー
A soft X-ray charged multilayered PTFE-based piezoelectret is proposed for kinetic energy harvesting. With the aid of the electrode embedded in the multilayered structure, higher surface charge density could be obtained with soft X-ray charging if compared with conventional corona charging. The output power of 0.5 μJ is obtained when pressed down by 0.3 mm in 0.2 s, which corresponds to the piezoelectric coefficient d33 of 155 pC/N. An electromechanical model is also developed and the results are compared with the experimental data.
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池端 淳, 小林 恒太, 福江 高志, 廣瀬 宏一, 畑 陽介, 石川 博幸
セッションID: H131
発行日: 2016年
公開日: 2017/06/19
会議録・要旨集
フリー
This study describes heat transfer characteristics in a rectangular bend that a sudden contraction or a sudden expansion simultaneously occurs. This flow pattern can be found in high-density packaging electronic equipment and heat exchanger. In order to predict heat transfer performance in electronic equipment, a prediction of heat transfer coefficient cannot be done easily by using conventional formulas for calculating heat transfer characteristics in simple ducts. This paper especially focused on the heat transfer performance in the upstream side of the bend in the rectangular duct with the sudden contraction or the sudden expansion through the CFD analysis. We found that the heat transfer performance was dependent on the cross-sectional area ratio of the bend significantly.
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向竹 良太, 本多 真人, 本田 逸郎, 河南 治
セッションID: H132
発行日: 2016年
公開日: 2017/06/19
会議録・要旨集
フリー
Recently, CFD is widely used at the design process of a heat exchanger. Almost CFD including commercial software often apply constant temperature treatment for boundary condition on the wall in these cases. However, it is useless at the design process of the high performance heat exchanger. Therefore, it is necessary that Solid-Fluid Coupling Method considering the wall heat conduction is used in these cases. The purpose of this investigation is to establish the numerical method for fluid/solid interaction in the thermal fluids. In this study, Solid-Fluid Coupling Method considering solid heat conduction between cooling fluid and cooled fluid is offered a suggestion. In particular, it has proposed a method to specify the temperature at the fluid/solid interface in the passage of the heat exchanger.
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-PIV 速度分布計測と CFD 数値解析-
北川 洋介, 保田 高志, 尾形 陽一, 西田 恵哉
セッションID: H133
発行日: 2016年
公開日: 2017/06/19
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フリー
PIV measurement and CFD numerical analysis were conducted to investigate the effect of rectangular vortex generator (VG) on flow and heat transfer in the rectangular channel, respectively. Since pressure on the lower side of VG is higher than the upper side, air flows into the side of the VG, two longitudinal vortexes of the channel central symmetry are generated. It was found that heat transfer coefficient in the wake of VG increases because the vortexes decrease viscous length over the face mounted VG. Furthermore, the vortexes transport hot gas in center of channel to the face, and the thermal boundary layer becomes thin.
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山田 俊輔, 中村 元
セッションID: H134
発行日: 2016年
公開日: 2017/06/19
会議録・要旨集
フリー
In this study, the oscillations of the heat transfer and flow behaviours near wall region in the channel flow were investigated. The instantaneous flow and temperature distributions are simultaneously measured by using dynamic 2D-2C PIV and the high-speed infrared thermography combined system. Using this system, the unsteady flow behaviours at the xy cross section and heat transfer on the heated wall are investigated in the Reynolds number of 920 based on the skin friction velocity and the channel half width. In order to discuss the flow and the thermal fields, the ensemble-averaged velocity and heat transfer coefficient were calculated by VITA (Variable-interval time-averaging) conditional sampling technique, and it seems that the increasing of the streamwise flow near wall region corresponds to that of the heat transfer enhancement on the heated wall.
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藤原 司, 小田 豊, 武石 賢一郎
セッションID: H135
発行日: 2016年
公開日: 2017/06/19
会議録・要旨集
フリー
A numerical method based on turbulence statistics obtained by LES (Large Eddy Simulation) was proposed to predict time-mean temperature field of conjugate heat transfer problem in complex turbulent flows. For the evaluation of turbulent heat flux in the time-mean field, a state-of-art heat flux model was newly adopted to enhance the prediction capability of time-mean temperature fields. Turbulence kinetic energy was estimated by the approximate budget of transport equation for turbulence kinetic energy. It is confirmed that prediction of dissipation rate of turbulence kinetic energy was improved.
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(層流域と乱流域での評価)
徳武 太郎, 村田 章, 岩本 薫
セッションID: H211
発行日: 2016年
公開日: 2017/06/19
会議録・要旨集
フリー
Large Eddy Simulation (LES) of channel flow with dimples on one side was performed. Four geometries of dimpled surface were examined: spherical dimple, teardrop-shaped dimple without inclination, and 30deg inclined teardrop-shaped dimple with in-line and staggered arrangements. Subgrid-scale model of LES was a dynamic Lagrangian model. The present results showed flow structure such as flow separation, reattachment, and circulation over dimpled surfaces. The three cases of the teardrop-shaped dimples showed higher Nusselt number than the spherical dimple case. 30deg inclined in-line case showed the highest Nusselt number, which was 18% higher than the spherical dimple case .
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井上 翔太, 上田 翔太, 土屋 利明
セッションID: H212
発行日: 2016年
公開日: 2017/06/19
会議録・要旨集
フリー
A model has been developed to investigate the evaporation effect of water droplets in a uniform duct flow under gas turbine compressor environments. The temperature of a water droplet has been calculated by treating the droplet as a lumped mass with a representative temperature uniformly distributed in the droplet. The proposed model consists of two steps. The 1st step is the heat transfer calculation between a water droplet and surrounding air flow and the 2nd step is the calculation to take the latent heat of vaporization into consideration.
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山口 朝彦, 岩﨑 将志, 筒井 燦, 桃木 悟
セッションID: H214
発行日: 2016年
公開日: 2017/06/19
会議録・要旨集
フリー
A hybrid model of Discrete Element Method (DEM) and Lattice Boltzmann Model (LBM) to analyse the heat and mass transfer for solid-gas two phase flow is explained and some results of numerical simulation by this model were shown in this paper. Since the particles flow is complicated, the physical phenomena is difficult to understand and the details of the flow cannot be observed. Therefore, numerical simulation is one of the significant approaches which solve the problem in regard to particles flows. The hybrid model of DEM and LBM is adapted to the recent high performance parallel computer systems. Hence, this model can be one of the powerful tools to illustrate and reveal the physics of particulate flows.
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