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30 巻, 219 号
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石沢 進午1964 年 30 巻 219 号 p. 1301-1316
発行日: 1964/11/25
公開日: 2008/03/28
ジャーナル フリーA theoretical analysis is presented for the inlet region of the laminar, redial flow in an arbitrarily shaped narrow gap between two axi-symmetrically formed walls. A series expansion method is used and the most general form of the exact solutions of the boundary layer equations is obtained. As an example, numerical calculations have been made for the flow in a radial diffuser formed by two parallel discs, by which the following important conclusions are confirmed. Separation of flow from the wall occurs, the separation point moving to downstream direction as the Reynolds number decreases. When the Reynolds number further decreases, reaching a value below a certain small finite value, separation does not occur. A result which is very important from the theoretical standpoint is that the separation point calculated in this study is not of a mathematical singularity. This is the first theoretical example verifying actually the existence of a non-singular separation, which has already been predicted by S. Goldstein, K. Stewartson and others抄録全体を表示PDF形式でダウンロード (1670K) -
植松 時雄, 森川 敬信, 趙 江来, 森国 勲, 朝田 有一, 山本 英昭1964 年 30 巻 219 号 p. 1317-1322
発行日: 1964/11/25
公開日: 2008/03/28
ジャーナル フリーIn der vorliegenden Arbeit befassen sich die Verfasser mit dem Druckabfall, der Geschwindigkeit der Teilchen und der Geschwindigkeitsverteilung der Forderluft in der lotrechten Rohrleitung sowie dem Druckabfall und der Geschwindigkeit der Teilchen im Krummer. Von den Verfassern ist die empirische Formel fur den Druckabfall in der lotrechten Rohrleitung erhalten worden. Es stellte sich aus den Versuchsergebnissen heraus, daβ der Druckabfall im Krummer von der Waagerechten in die Lotrechte nach oben groβer ist als der im Krummer von der Lotrechten nach oben in die Waagerechte, und daβ die Geschwindigkeit der Teilchen in der lotrechten Rohrleitung ganz anders ist als die in der waagerechten Rohrleitung. Bei kleiner Beladung bewirken die im Gase enthaltenen Teilchen fast keinen Einfluβ auf die Geschwindigkeitsverteilung der Forderluft in der lotrechten Rohrleitung抄録全体を表示PDF形式でダウンロード (724K) -
石谷 清幹, 山根 正和, 老固 潔一1964 年 30 巻 219 号 p. 1323-1329
発行日: 1964/11/25
公開日: 2008/03/28
ジャーナル フリーIn contrast to the single-phase flow, the gas-liquid two-phase flow is generally accompanied by violent pressure fluctuations. If the fluctuation is found to follow a certain law, the law may be useful in measuring the component flow in the two-phase mixture. From this view point, the pressure fluctuation was analyzed. This paper is the first report on the result of this analysis. A JIS orifice was fitted at the outlet of a vertical 1 inch bore pipe through which air-water mixture flowed upward. The pressure at a point immediately before the orifice was recorded and analyzed. It was found that the pressure was either larger or smaller than the time-average pressure, and never stayed at the average amount. Therefore the time rate during which the pressure was larger than the average was definitely measurable. This quantity was named the liquid-phase time ratio, and its properties were examined. If the flow rate of each component of the gas-liquid mixture was given, the new quantity was found to have a definite amount抄録全体を表示PDF形式でダウンロード (873K) -
石谷 清幹, 山根 正和, 老固 潔一, 高城 敏美, 田中 勝己1964 年 30 巻 219 号 p. 1330-1338
発行日: 1964/11/25
公開日: 2008/03/28
ジャーナル フリーFor the two-phase slug flow in the vertical tube, a simple flow model was proposed, by means of which the quantities defined in previous report were theoretically correlated. A series of experiment was carried out, and it was proved that the actual slug flow could be fundamentally described by the proposed flow model. Also, the two-phase discharge coefficient of the orifice was defined and experimentally correlated with the component volume flow. It was found that the component flows could be estimated by measuring the average pressure drop across the orifice and the time ratio or the void ratio抄録全体を表示PDF形式でダウンロード (1077K) -
原 朝茂1964 年 30 巻 219 号 p. 1339-1344
発行日: 1964/11/25
公開日: 2008/03/28
ジャーナル フリーThe running resistance of a train is composed of two parts, i.e. mechanical resistance and aerodynamic one. The ratio of the latter to the former increases remarkably with train speed, so it is very important for the planning of high speed trains to estimate the aerodynamic drag accurately. We have, however, only insufficient knowledges about it so far. In the test using actual trains only the total running resistance can be measured but aerodynamic drag can not be obtained separately. And also in the model test in a wind tunnel it was practically impossible, though possible in principle, to obtain quantitatively accurate data, because of the inevitable reduction of model size and of the difficulties of experiments using models with rolling wheels and moving ground. As such was the case, there was no way but to rely on unsatisfactory data. The author finds that the aerodynamic drag is closely related with the pressure rise on the side surface of a train, when it rushes into a tunnel, and that the aerodynamic drag can be obtained from this pressure rise independent of the mechanical resistance. The mean aerodynamic drag coefficient of streamlined train obtained through this method can be expressed as followed : 〓=0.12+0.0075χ where χ is the length of a train in meters抄録全体を表示PDF形式でダウンロード (787K) -
白木 武, 小林 喜徳1964 年 30 巻 219 号 p. 1345-1351
発行日: 1964/11/25
公開日: 2008/03/28
ジャーナル フリーIt is the purpose if this study to find out the universal properties of ball plunger pomp by experiments. The ball plunger pump is one of the plunger type displacement pumps but the standard ball-bearings are used as plungers instead of cylindrical prisms. The authers carried out several experiments on leakage rates, volumetric efficiencies, torque efficiencies and total efficiencies, and obtained the following results : (1) The leakage rates properties of this pump are different from those of other displacement pumps, they depend on rotational speeds of this pump. (2) The general experimental equation on every efficiency that we found from this study shows clearly the universal properties of this pomp抄録全体を表示PDF形式でダウンロード (904K) -
大橋 秀雄1964 年 30 巻 219 号 p. 1352-1360
発行日: 1964/11/25
公開日: 2008/03/28
ジャーナル フリーTo take out mechanical power from high pressure oil, impulse type oil turbine of a construction similar to Terry steam turbine was developed on the basis of the fundamental experiment and the study of performance of test turbine. The turbine mainly consists of a nozzle, aturbine wheel with many deflection grooves and several fixed deflection boxes. Comparing with positive-displacement type oil motor, the oil turbine has distinguished points such as feasibility of high rotational speed, low idling resistance, simple construction etc. As the fundamental experiment, the static test of two-dimensional deflection grooves was carried out and design data for deflection groove with minimum losses were given. Based on the data obtained from the above, a test turbine was built, and its performance was measured at different rotational speed and also at different jet velocity. From this study the limit of performance of impulse type oil turbine was clarified, and the necessary data for designing oil turbine were obtained抄録全体を表示PDF形式でダウンロード (1132K) -
岡本 芳三1964 年 30 巻 219 号 p. 1361-1368
発行日: 1964/11/25
公開日: 2008/03/28
ジャーナル フリーWhen the finned surface is used for heat exchangers, space radiators, or nuclear fuelelements under high temperature, there are some cases where the fin emits the radiative or convective energy with the internal heat source. This report shows the analysis of the net convective fin with the internal heat source. It was already obtained by Gardner(2) and Minkler(8) to solve the temperature distribution and efficiency of the net convective fin. But the systematic analysis has not yet been analysed. The dimensionless steady-state conduction equation of the plate or annular fin is introduced. By solving this equation, the temperature distribution and the efficiency are obtained. And, the effect of the fin thickness on the temperature distribution is checked. Finally, a new relation between the net convective fin and the convective fin with the internal heat source is formulated抄録全体を表示PDF形式でダウンロード (803K) -
馬渕 幾夫1964 年 30 巻 219 号 p. 1369-1377
発行日: 1964/11/25
公開日: 2008/03/28
ジャーナル フリーExperimental results are presented for the effectiveness of film cooling of cold air film injected through a preceded porous section of a flat plate covered by fully established turbulent boundary layer and correlated with an empirical equation. Also, some considerations are made to distinguish the character in the effectiveness of tangential slit injection from that in the present partially porous injection抄録全体を表示PDF形式でダウンロード (1117K) -
森 康夫, 二神 浩三, 徳田 仁, 中村 昌邦1964 年 30 巻 219 号 p. 1378-1385
発行日: 1964/11/25
公開日: 2008/03/28
ジャーナル フリーIn forced convective heat transfer in a horizontal straight pipe, buoyancy is considered to cause a serious difference between theoretical and experimental results. This report is devoted to the clarify the effect of buoyancy on this problem by accurate experiment on fully developed flow of air with constant heat flux. Velocity and temperature distributions are measured for large ReRa and these are shown to be essentially different from those known so far, for example, Poiseuille profile for velocity field. Nusselt numbers are calculated from measured velocity and temperature distributions and shown to be about twice as large as those calculated by neglecting buoyancy at ReRa=4×105. In the turbulent region, buoyancy gives little effect on velocity and temperature fields, but the critical Reynolds number is experimentally proved to be affected by buoyancy抄録全体を表示PDF形式でダウンロード (995K) -
坪内 為雄, 佐藤 千之助, 増田 英俊1964 年 30 巻 219 号 p. 1386-1393
発行日: 1964/11/25
公開日: 2008/03/28
ジャーナル フリーIn the previous, paper the authors reported the experimental results of heat transfer rates between single particles and air due to natural convection, the specimens of which were small bead type thermistors. The correlation of Nu(L) and Gr(L) was extrapolated to that of Nu(L) and Gr(L)Pr, simply following the similarity law. In this paper, the authors have measured the heat transfer coefficient of small particles in the still liquids of different Prandtl Numbers and ascertained that the extrapolated correlation in the previous report holds good in the wide range of Pr as 0.71∼105 which could be written as [numerical formula] where L=2 (volume)/(surface area), and Nu, 0(L)=the limiting Nusselt Number抄録全体を表示PDF形式でダウンロード (1040K) -
坪内 為雄, 増田 英俊1964 年 30 巻 219 号 p. 1394-1401
発行日: 1964/11/25
公開日: 2008/03/28
ジャーナル フリーIn the previous paper, the authors reported experimental results of heat transfer coefficients between small particles and air due to the forced convection, the specimens of which were small bead type thermistors. In the present paper, the authors have measured the heat transfer coefficients between small particles and flowing liquids of different Prandtl Numbers to clarify the effect of Prandtle Number upon the heat transfer rates, and obtained the experimental formula as follows : [numerical formula], where, K=0.25 and m=1/3, for the range of Re(L)=6×10-4∼0.2 and [numerical formula]=0.4∼12 ; K=0.33 and m=1/2, for the range of Re(L)=0.2∼800 and [numerical formula]=0.4∼27 ; in which L=2 (volume)/(surface area) and Nu, 0(L)=limiting Nusselt Number抄録全体を表示PDF形式でダウンロード (1148K) -
坪内 為雄, 太田 康昌1964 年 30 巻 219 号 p. 1402-1408
発行日: 1964/11/25
公開日: 2008/03/28
ジャーナル フリーMany studies have been made on the heat transfer of pins in connection with pin-fin heat-exchangers as the heat conduction problems but hardly measured their heat transfer rate. In this point of view, as the first step, the authors have measured the heat transfer rate between a single circular pin which is fixed on a plate in parallel air flow. The pin, having the diameter D=12 mm and the length L=12 mm∼36 mm, is fixed on the plate 615 mm in length and 110 mm in breadth ; the position of the pin is varied five different distances from the entrance edge of the plate. The plate and the pin are separately heated ellectrically and the heat loss from the pin is determined. The results of these experiments have been expressed by the experimental formula in the range of Reynolds number Re(D)=2×103∼2×104, and from which the effectiveness of a pin-fin surface has been calculated抄録全体を表示PDF形式でダウンロード (847K) -
小竹 進, 岡崎 卓郎1964 年 30 巻 219 号 p. 1409-1418
発行日: 1964/11/25
公開日: 2008/03/28
ジャーナル フリーThe effects of the shape of nozzle-exit, the size of nozzle-exit, the multiple nozzle (jet-interference) etc. on the generation of noise and the mechanism of noise reduction of the widely used noise suppressors are investigated. With the change of the shape or the size of nozzle-exit, the noise intensity per unitfrequency increases proportionally to the second power of the characteristic length of nozzle-exit at the lower frequencies and to the fourth power of that length at the higher frequencies. The interference between jets causes the change of the turbulent velocity-field and reduces the strength of acoustic sources in the mixing region to the degree of the strength in the turbulent region. This accounts for the mechanism of noise reduction of tubular or lobed nozzles. The rate of associated noise-attenuation is evaluated on the basis of experimental results of the turbulent velocity-field. The closer the ratio of the width of nozzle to the space between nozzles to unity on average, the more improved is the characteristics of noise-reduction抄録全体を表示PDF形式でダウンロード (1027K) -
高浜 平七郎1964 年 30 巻 219 号 p. 1419-1427
発行日: 1964/11/25
公開日: 2008/03/28
ジャーナル フリーIn this paper, the author tried to investigate the relation between the profiles of velocity and temperature of air flowing in a vortex chamber and the dimensions of main tube, nozzle, cold end orifice, etc. He obtained data for designing a standard type of vortex tube with high efficiency of energy seperation. He also obtained formulae for the profiles of velocity, temperature and energy of air flowing in a standard vortex chamber, considering the air flow in the annular region as a wall jet. Unlike formulae represented hitherto, these formulae do not include factors such as radial velocity component or turbulent diffusivity and so may be used to predict performance or efficiency of a standard vortex tube under any working conditions抄録全体を表示PDF形式でダウンロード (1039K) -
今井 健次1964 年 30 巻 219 号 p. 1428-1439
発行日: 1964/11/25
公開日: 2008/03/28
ジャーナル フリーThe distributions of flow rate and mixig ratio are studied for a spray generated by two impinging jets which are generally used for bipropellant liquid rocket systems using hypergol. The propellant system was simulated by the water model in the previous report (1st report), in which two jets had same sizes and same injection pressure drop. The water model was adopted again in teh present report using two jets with different sizes and injection pressure drop. When two jets impinge together with different injection pressure drop from two orifices of same sizes, the total mixing efficiency of teh spray decreases as the difference of the pressure increases. When the injection pressure drop is same and the dimensions of orifices are different, the total mixing efficiency varies with the increase of the difference of the diameters, but the variation is small. When two jets were composed from immiscible liquids, the state of mixing is basically same with that of miscible liquids抄録全体を表示PDF形式でダウンロード (1562K)
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