巻号一覧
前身誌
20 巻, 96 号
選択された号の論文の11件中1～11を表示しています
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橘 藤雄1954 年 20 巻 96 号 p. 515-516
発行日: 1954年
公開日: 2008/03/28
ジャーナル フリーPDF形式でダウンロード (476K) -
原 朝茂1954 年 20 巻 96 号 p. 517-520
発行日: 1954年
公開日: 2008/03/28
ジャーナル フリーPreviously Pohlhausen and recently Ostrach calculated the velocity and temperature distributions about a heated flat plate which is placed vertically in air, neglecting the variation of property values depending on temperature except the buoyancy term. There exists some discrepancy between their theoretical values and the experimental results which were measured by Schmidt and Beckmann. The author solved momentum and energy equations taking into account the variation of properties depending on temperature, by perturbation theory using Pohlhausen's solution as 0 approximation. It is assumed that (1) Prandtl number is 0.733 ; (2) specific heat is constant ; and (3) viscosity and thermal conductivity vary in proportion to T0-76 where T is absolute temperature. Agreement between the velocity and temperature distributions obtained here and those measured by Schmidt and Beckmann is good. Calculated value of Nusselt number can be expressed as follows : Nu1=0.359 G1/4γ1(1-0.055T0-T1/(T1)) where T0 and T1 denote the absolute temperatures of the flat plate and of the undisturbed air, respectively and Nu1 and Gr1 are respectively Nusselt and Grashof numbers evaluated at undisturbed condition.抄録全体を表示PDF形式でダウンロード (484K) -
谷下 市松1954 年 20 巻 96 号 p. 521-526
発行日: 1954年
公開日: 2008/03/28
ジャーナル フリーExperiments were carried out on liquid drop falling in the air or rising in the water, and from the results of these experiments, it was found the general rules upon the motion and stability of a fluid drop or bubble moving through any fluid medium. The terminal velocity of the drop increases as the size of drop increases up to a maximum value, from where again the velocity decreases, and finally the drop breaks up causing unstable wave motion. Below the maximum velocity, the value of nondimensional quantity [numerical formula] is constant and equals to 1.03, and above it the value of ditto is 2.65. The nondimensional quantity [numerical formula] is about 1.3 at the point of maximum velocity, and it is about 2.3 at the point of instability. In the previous formula, γ is the radius of drop, v is the velocity of drop, g is gravitational acceleration, γa and γb are the specific weights of the medium and the drop, and T is the surface tension at the interface of the drop and the medium.抄録全体を表示PDF形式でダウンロード (807K) -
谷下 市松1954 年 20 巻 96 号 p. 527-531
発行日: 1954年
公開日: 2008/03/28
ジャーナル フリーFrom the experimental results explained in the first report, it may be said that the method of solving the problem of the motion and stability of a fluid drop or bubble moving through any fluid medium, which hold generally, was derived and, as an example, the motion and stability of a mercury drop falling through the air and water were studied.抄録全体を表示PDF形式でダウンロード (645K) -
喜多野 晴一1954 年 20 巻 96 号 p. 531-537
発行日: 1954年
公開日: 2008/03/28
ジャーナル フリーThe effects on thermodynamical cycle due to cylinder gas leakage were calculated, and compared with experimental results. This paper involves Otto cycle only. On gas leakage cycle, general solution was proposed for evaluating end-pressure and residual gas quantity of compression or expansion stroke. On the calculation of cycle, regarding gas leakage as heat loss, gas quantity during a cycle was assumed constant, and also it was assumed that calorific value of combustion gas decreases in proportion to gas leakage during compression stroke. In conclusion difference between leakage cycle and perfect cycle changes for the more according to the increase of leakage area and compression ratio, the decrease of number of revolutions and stroke volume. The results of calculation coincide approximately with experimental results.抄録全体を表示PDF形式でダウンロード (700K) -
喜多野 晴一, 丸尾 寿彦1954 年 20 巻 96 号 p. 537-541
発行日: 1954年
公開日: 2008/03/28
ジャーナル フリーUsing a low-grade light oil, we researched experimentaly the influence of mixture-heating on the performance of a small kerosene engine. For light load mixture-heating has given remarkable effect on thermal efficiency, and it has been found that the effect arises from the increase of combustion-joining factor. But for a load near full load this method induces knocking, and remedy for knocking becomes necessary. On the other hand, it has been found that pre-heating of fuel oil itself is almost inefficient.抄録全体を表示PDF形式でダウンロード (701K) -
菅原 菅雄, 佐藤 俊, 坂本 直登1954 年 20 巻 96 号 p. 542-548
発行日: 1954年
公開日: 2008/03/28
ジャーナル フリーThe oil vapout ejector operates under the delivery pressure of a few mm Hg and has a large pumping speed at the suction pressure of 0.01∼0.1 mm Hg. We have studied on this ejector for the purpose of obtaining data to be applied to its design. For the working fluid we have used the transformer oil. By the experiment, we have verified the existence of the so-called hysteresis phenomena in the oil vapour ejector as in the case of the steam ejector, and also we have studied the effects of some factors upon the pumping speed, that is the effects of the auxiliary pump, the pressure before nozzle, the relative position between nozzle and diffuser, the expansion ratio of nozzle and the cooling condition in diffuser and besides studied on the law of similarity. About the hysteresis phenomena we will report in the subsequent paper.抄録全体を表示PDF形式でダウンロード (978K) -
菅原 菅雄, 佐藤 俊, 坂本 直登1954 年 20 巻 96 号 p. 548-552
発行日: 1954年
公開日: 2008/03/28
ジャーナル フリーBy the experiments we have studied on the effects of some factors upon the hysteresis phenomena in the oil vapour ejector and considered their results in comparison with the results of experiments in the steam ejector. Main conclusions are as follows : - 1) The hysteresis phenomenon appears, in the case of a certain suction weight, when the delivery pressure reaches a certain critical value and the rate of the over expansion of oil vapour flow in the nozzle comes to a certain extent. 2) The hysteresis phenomenon is harder to appear, according as the pressure before nozzle becomes higher in a certain nozzle, and the expansion ratio of nozzle is larger if the pressure before nozzle is suitable to the expansion ratio, and as the capacity of auxiliary pump is larger.抄録全体を表示PDF形式でダウンロード (763K) -
森 康夫1954 年 20 巻 96 号 p. 552-558
発行日: 1954年
公開日: 2008/03/28
ジャーナル フリーA general fromula of an efficiency of radial-flow gas turbine, including the rotationary loss was introduced by adopting three parameters-the flow factor, the ratio of radial components of absolute velocities at the inlet and the outlet of the impeller and the ratio of the inner and the outer diameters. When the angle of the impeller at the outlet was given or the absolute velocity at the outlet of the impeller was radially directed, the relations at the optimum and the maximum efficiency were given. The characteristics of radial-flow gas turbine, when the ratio of the inner and the outer diameters was 0.6, were shown, the effect of the rotationary loss was discussed and the case when the absolute velocity at the outlet of the impeller was radially directed, was proved to be not optimum. Then a radialflow gas turbine for supercharging a diesel-engine was designed and the velocity diagram was shown with the dimensions of its impeller.抄録全体を表示PDF形式でダウンロード (920K) -
青木 成文1954 年 20 巻 96 号 p. 558-563
発行日: 1954年
公開日: 2008/03/28
ジャーナル フリーAs the heat and mass transfer problem of humid air cooling on finned pipe is necessary for air conditioning, the auther researches the heat transfer coefficient for finned pipe cooler. The cooler is set perpendicular to air flow and cooled by brine with temperature -5∼0°C. From the the results, it ts recognized that the analogy between heat and mass transfer exists and that the ratio of both coefficient α/k is about 0.21 kcal/kg°C. The ratio of heat transfer coefficient for wet and dry surface can be calculated from the experimental formula or nomograph of it.抄録全体を表示PDF形式でダウンロード (784K) -
石谷 清幹, 山崎 泰雄, 小泉 倫吉1954 年 20 巻 96 号 p. 566-572
発行日: 1954年
公開日: 2008/03/28
ジャーナル フリーThe frequency distribution of the heat-flow intensity on the furnace walls radiated by homogenous gases which completely fill the furnace does not coincide with the distribution in the actual furnaces as tested by the ASME Committee. In an ideal furnace with a point heat source at its center, however, the frequency distribution is very similar to that of the intensity of heat-absorption in an actual furnace, provided radiation from the point heat source and radiation from the homogenous gas are combined properly. Since the distribution in a burner-fired furnace is not affected by the form of furnace or operating conditions, this fact may well be utilized in deriving an improved method of calculating heat-absorption in boiler-furnaces. Effective thickness of the flame in boiler furnaces as calculated by the Hottel method gives larger value than the rigorously calculated thickness. This is especially the case in a large modern furnace or with the luminous flame or powdered-coal flame. In this paper, the coefficients which give correct beam length are presented graphically.抄録全体を表示PDF形式でダウンロード (873K)
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