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18 巻, 72 号
選択された号の論文の12件中1～12を表示しています
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長尾 不二夫, 大東 俊一1952 年 18 巻 72 号 p. 1-6
発行日: 1952/08/15
公開日: 2008/03/28
ジャーナル フリーThis paper provides the results based on the pictures of the flame development in the cylinder of a gasoline injection engine, and the relation between the increase of combustion volume and the heat liberating process of combustion is discussed. When the cylinder injection system is used, it has been observed that complete burning does not follow the flame ; after the flame propagation is completed, the charge continues to burn for a considerably long time.抄録全体を表示PDF形式でダウンロード (1093K) -
菅原 菅雄, 佐藤 俊, 北尾 正幸1952 年 18 巻 72 号 p. 6-10
発行日: 1952/08/15
公開日: 2008/03/28
ジャーナル フリーIn the 2nd report, we reported on the experimental results regarding to heat transfer on the surface of a roughened plate with grooves on its surface. In this paper, we report on the results of experiments performed on the artificial rough plate with projections on its surface. The height of projections is 0.5mm high, that is same as the depth of grooves of the rough plates used in the experiments of the 2nd report, and its pitch is changed in 5 kinds. We knew from those experiments that in the range of larger numbers than a certain Reynolds' number, there was formed a special turbulent boundary layer which was influenced by the surface roughness, and in its range, Nusselt's number was almost proportional to Reynolds' number. This tendency is like a that of the results of the 2nd report, but the effects on the surface heat transfer of the projections are somewhat larger than that of the grooves.抄録全体を表示PDF形式でダウンロード (692K) -
菅原 菅雄, 佐藤 俊, 巽 竹次1952 年 18 巻 72 号 p. 11-16
発行日: 1952/08/15
公開日: 2008/03/28
ジャーナル フリーThis experiment was performed to make clear the influences of surface roughness on surfaceheat transfer systematically. In giving roughness to a plate surface, we created artificial roughness by carving projections of a fixed pitch. And by changing the pitch and height of projection, we researched the influence of surface roughness. Main results are as follows : - A turbulent boundary layer which is influenced by surface roughness is formed at larger Reynolds' number than a certain Reynolds' number and in this region the results almost satisfy the following relation. Nu=K'·Re Where, Nu is Nusselt's number. The value of K' becomes maximam in every kinds of the height of roughness at h/p=0.055, which means the best heat transfer in such condition. The maximam value of K' becomes larger as the height of surface roughness becomes heigher.抄録全体を表示PDF形式でダウンロード (761K) -
中川 有三, 吉田 哲夫1952 年 18 巻 72 号 p. 16-23
発行日: 1952/08/15
公開日: 2008/03/28
ジャーナル フリーAt quenching period the test bodies were rapidly cooled through the three processes, film state boiling, bubble state boiling, natural convection. The authors intend to report in the present paper as to how heat transfer coefficient a during the cooling rapid is changed by various shapes of test piece (solid cylinder, sphere, cub). Arranging the data of the experiments, the authors reached to the following conclusion : (1) Red heated bodies are cooled to the boiling temperature of coolant during the process of film state boiling, notwithstanding the variation of shapes of the bodies. (2) Cooling ability is greatly promoted by reducing the thickness of vapor film on the surface and shortening of its clinging times. (3) a, during quenching period, has different values with the variation of shapes of the test bodies and the order of α values is sphere <cylinder <face of cub <edge of cub <corner of cub.抄録全体を表示PDF形式でダウンロード (1390K) -
平野 冨士夫, 西川 兼康1952 年 18 巻 72 号 p. 23-26
発行日: 1952/08/15
公開日: 2008/03/28
ジャーナル フリーAs previously reported, we found that the Nusselt number at the stage of nucleated boiling is proportional to N1/3, where n is the number of nuclei of steam bubbles generated on horizontal heating surface. In this paper we derive this relation theoretically assuming that the main driving forceof convection is the change of apparent density by rising bubbles. Further we discuss the nature of n, especially in connection with the contamination on the heating surface.抄録全体を表示PDF形式でダウンロード (535K) -
西川 兼康, 谷 幸男, 柴田 澄雄, 日高 哲雄1952 年 18 巻 72 号 p. 27-30
発行日: 1952/08/15
公開日: 2008/03/28
ジャーナル フリーOn the heat transfer to boiling liquids many investigations were carried out, but their results indicated no satisfactory coincidence. It arises from the existence of the mutal dependence between the generation of vapour bubbles and the flowing condition of liquids. The properties of heating surface, which influence directly on the generation of vapour bubbles have been hitherto discussed, but the heat loss from the side-wall of experimental apparatus has been out of consideration. This heat loss may influence on the flowing condition of liquids and the generating state of vapour bubbles. In this experiment we investigated the influence of heat loss from the side-wall of experimental apparatus on the coefficient of heat transfer. Experiments were carried out as follows : (1) heater ; upwards horizontal metal heating surface (dia. 10 cm) (2) liquids : distilled water (3) heat flux : 6560∼19690 kcal/m2h (4) jacket water temperature : 90∼100°C And we found that the heat loss from the side-wall of experimental apparatus influenced greatly on the coefficient of heat transfer to boiling liquids. Therefore, one must take care of this heat loss on the measurement of coefficient of heat transfer to boiling liquids.抄録全体を表示PDF形式でダウンロード (580K) -
石谷 清幹, 赤川 浩爾, 武田 克巳, 永田 和彦1952 年 18 巻 72 号 p. 31-37
発行日: 1952/08/15
公開日: 2008/03/28
ジャーナル フリーThe upward flow of the mixture of air and water in perpendicular glass tubes, which are 50.5 and 24 mm in inside diameter and 1400 mm in length, were observed and photographed. The flowing rate of water was between 0 and 130 cm3/s/cm2 of the tube cross section, and the rate of the air was between 0 and 55 in the same unit. 1. There are two types of flow. one is the separated flow and the other is the uniformly distributed flow, in which air bubbles of nearly equal size are uniformly distributed in the water. 2. The mean specific weight of the mixture has its minimum at the point of transition of the two types of flow. 3. In the separated flow, the relative velocity is affected by numerous factors and is substantially higher than that in the uniformly distributed flow. The relative velocity in the uniformly distributed flow is practically constant.抄録全体を表示PDF形式でダウンロード (1817K) -
吉川 潤一郎1952 年 18 巻 72 号 p. 37-43
発行日: 1952/08/15
公開日: 2008/03/28
ジャーナル フリーRecent years, pressure and capacity of steam generating units have been rapidly increased with the improvement of efficiency of the power plant. In such a high pressure, it will become difficult to obtain adequate circulation of water without the suitable method of design. On the several assumption, the author applied "Bernoullis' theorem" to the simple evaporating circuit and introduced a practical formula obtaining the number "n" of uprisers to downcommer, giving the boiler pressure, heat absorption rate, top dryness of the upriser, friction coefficient, diameter of the tube and height of the boiler, and also, to obtain rapidly "n", introduced a graphie chart from this formula. Using these theories, we discussed about many factors affecting circulating velocity, number "n" and economics of the circulation system, and especially recognized that it is economically advantageous to use few downcammers having large diameter, as the boiler becomes larger.抄録全体を表示PDF形式でダウンロード (770K) -
山中 秀男1952 年 18 巻 72 号 p. 43-48
発行日: 1952/08/15
公開日: 2008/03/28
ジャーナル フリーThe actual amount of the stress at the margin of flat part of the flanged end can be calculated from the data obtained by strain-meters, but to estimate that in this way at the curved part is difficult ; the writer, therefore, calculated the latter from the results of the former as follows. The writer treated the curved part as a shell having a form of a surface of revolution. The equations of the stresses for a part which normal makes comparatively large an angle of θ to that of the margine were deduced from the equilibrium of forces acting on an element, but for the other part, K. Stange's solution of ring-shell was applied. The integration constants for these equations were determined from the condition of continuity having a common angle θ mentioned above at a part.抄録全体を表示PDF形式でダウンロード (582K) -
山中 秀男1952 年 18 巻 72 号 p. 49-55
発行日: 1952/08/15
公開日: 2008/03/28
ジャーナル フリーThe stress of the unstayed flat end or flat crown supported by the shell plate and a flue or chimney tube has not been yet clearly solved. In this paper, an exact solution of this question has been shown theoretically and experimentaly ; especially the influence of the expansion by heating, the elastic strain, the longitudinal displacement relative to the shell and the radial displacement by the internal pressure, of the flue or chimney tube ; the stresses of the endplate has been discussed, and also the allowable atresses required for the design of boiler endplate were considered.抄録全体を表示PDF形式でダウンロード (765K) -
植田 辰洋1952 年 18 巻 72 号 p. 56-60
発行日: 1952/08/15
公開日: 2008/03/28
ジャーナル フリーEach dimension of the steam ejector has the great effects on its characteristic and efficiency. Then it is the purpose of this paper to know the effects of the dimensions of diffuser on the steam ejector. By the calculation method of flow in diffuser (2nd Report), the following facts have been discovered. The length of convergent part of diffuser L1 is to be long as much as possible. If the diameter of diffuser throat Dt is made small, the exit pressure of diffuser will take high value, but the hysteresis phenomena will be apt to rise. It is desirable to make the length of throat Lt=(5∼6)·Dt and the length of divergent part L≨ 10Dt.抄録全体を表示PDF形式でダウンロード (585K) -
有馬 文次1952 年 18 巻 72 号 p. 61-63
発行日: 1952/08/15
公開日: 2008/03/28
ジャーナル フリーFixation of the Japanese lacquer by baking, which undergoes oxidation, polymerisation or condensation, has been considered very troublesome, The writers of this note got a successful result, a short-time fixation, by use of infra-red drying. Temperature-raising curve, suitable to accelerate the proper chemical reaction of the specimen, was first searched after, by controlling the intensity of illumiration by transferring the infra-red lamps. Thus the illumination curve, against time, suitable for cach specimen was obtained. Some researchers control the intensity of illumination by dropping the electric voltage. But, even when the intensity of illumination on the Japanese lacquer surface is kept the same by approaching the lamps, the lowering of temperature of the heat source causes the increase of the wave length beyond its suitable range, and reduces the drying efficiency, diminishing the hardness of the Japanese lacquer film, as means the in completion of the baking.抄録全体を表示PDF形式でダウンロード (495K)
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