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19 巻, 88 号
選択された号の論文の10件中1～10を表示しています
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岡崎 卓郎, 五味 丸典1953 年 19 巻 88 号 p. 1-6
発行日: 1953/12/20
公開日: 2008/03/28
ジャーナル フリーIn this paper, the rate of combustion and avaporation of a fuel droplet under different pressures and oxygen concentrationsa is calculated on the following assumptions. 1. The fuel droplet and the flame front have concentric spherical shapes. 2. The concentrations of fuel vapor and oxygen are both zero at the flame front. 3. The effects of natural convection and heat radiation are neglected. 4. The temperature distribution in the fuel droplet is uniform. 5. The combustion phenomena are in steady condition at an arbitrary instant. As a result of calculation, it has been found that the rate of evaporation decreases at low temperature and increases slightly at high temperature, and the rate of combustion increases as the atmospheric pressure increases. The rate of combustion decreases greatly as the oxygen concentration decreases.抄録全体を表示PDF形式でダウンロード (910K) -
久我 修1953 年 19 巻 88 号 p. 6-10
発行日: 1953/12/20
公開日: 2008/03/28
ジャーナル フリーIn this paper, heat transfer of liquid metal flowing turbulently in circular pipes is discussed. This problem has already been studied by various authors, especially by Martinelli, who states that the unit conductance for convective heat transfer is proportional to the square root, rather than the first power, of the friction factor. The present author, however, presents a new theoretical formula which is an extension of Karman's equation considering the effect of molecular conduction in the turbulent core.抄録全体を表示PDF形式でダウンロード (734K) -
菅原 菅雄, 岐美 格1953 年 19 巻 88 号 p. 10-15
発行日: 1953/12/20
公開日: 2008/03/28
ジャーナル フリーThis paper deals with the effects of a forced convection on the heat transfer by turbulent natural convection, when both convections occur in the same direction on a vertical flat plate, and the relations among Nusselt's, Grashoff's and Reynolds' number are theoretically analyzed. As the result of this study, we found that, in some cases, the coefficient of heat transfer by combined natural and forced convections is several times as large as that by the natural convection or the forced convection alone, and the natural convection can not be neglected when the velocity of forced convection is comparatively small and the temperature differences between the plate and the fluid is large.抄録全体を表示PDF形式でダウンロード (892K) -
村川 勝彌1953 年 19 巻 88 号 p. 15-19
発行日: 1953/12/20
公開日: 2008/03/28
ジャーナル フリーFor the purpose of theoretical analysis of heat transfer of laminar flow through concentric pipes with annular space, the boundary conditions were treated generally as the function of the axial direction, assuming the velocity distribution to be the function of the radial direction, using the Laplace transformation and reductions to Volterra's integral equation of the 2 nd kind, the solution was found, when the surface temperature distributions of pipe walls were given. Accomplishing experiments and numerical calculation, the theory was compared with the experiments. Taking the physical constants corresponding to the mean surface temperature of inner pipe and using 2(r2-r1) as the equivalent diameter, it was found that the formula of circular pipe was applied to the pipes with annular space.抄録全体を表示PDF形式でダウンロード (794K) -
小笠原 光信1953 年 19 巻 88 号 p. 20-22
発行日: 1953/12/20
公開日: 2008/03/28
ジャーナル フリーThe object of this research is to find the steady temperature distribution in a circular cylinder of finite length, when its one end part is heated by a high temperature liquid and the other part is left freely in the atmosphere. Heat transfer coefficient on the one part is assumed to be a constant, and on the other, another constant. The method of joinning is applied. Firstly, an infinite cylinder is analysed, in order to know the effect of the different heat transfer coefficients. Secondly, taking the end effect into consideration, the finite one is treated. Approximate formulae for the results of analysis are established, and checked for some cases. It is found that they can be used for practical purposes with sufficient accuracy.抄録全体を表示PDF形式でダウンロード (525K) -
小笠原 光信1953 年 19 巻 88 号 p. 23-27
発行日: 1953/12/20
公開日: 2008/03/28
ジャーナル フリーIn our previous study on the problem of heat conduction, it was required to solve the linear simultaneous equations with infinite unknowns. In this report, methods to solve those equations are dealt with. We assume that the existence and the uniqueness of the solution are assured from the physical meaning of the given problem. The main procedure of this method is the transformation of simultaneous equations into a Fredholm's integral equation. Firstly, a method to find an exact solution ; secondly, for the cases where an exact one cannot be found, an approximate method is established. Lastly, applyng the latter to a problem of heat conduction, a good result is obtained.抄録全体を表示PDF形式でダウンロード (819K) -
小笠原 光信1953 年 19 巻 88 号 p. 27-32
発行日: 1953/12/20
公開日: 2008/03/28
ジャーナル フリーIn treating the cooling problem of a solid body situated in the air, when the initial temperature difference between the solid and the surroundings is not small, the effects of the air convection and the surface radiation of the solid must be considered separately. In this report, taking only the effect of radiation into consideration and assuming that it follows the T4-law, the surface temperature variations due to cooling of a semi-infinite body, an infinite plate, an infinite cylinder and a sphere are calculated.抄録全体を表示PDF形式でダウンロード (781K) -
平野 冨士夫, 西川 兼康1953 年 19 巻 88 号 p. 33-39
発行日: 1953/12/20
公開日: 2008/03/28
ジャーナル フリーPreviously the authors reported the effect of scale deposits on heat transfer to boiling water, but the hardness of the boiling water used in the experiment was unknown. In this repost the relation between heat transfer and hardness is investigated, using solutions of known hardness. When the hardness is lower, the coefficient of heat transfer increses with the increase in scale deposits and reaches the limit independent of hardness. But it decreases, when the concentration of the solution becomes supersaturate.抄録全体を表示PDF形式でダウンロード (1857K) -
赤川 浩爾1953 年 19 巻 88 号 p. 40-44
発行日: 1953/12/20
公開日: 2008/03/28
ジャーナル フリーIt has been an usual practice, in calculating the water-circulation in boilers, to assume that the boiler tubes are uniformly heated along their length and that the relative velocity between vapour and liquid is either constant or neglisgible. These assumptions, however, are far from reality. In this paper, is presented a method of calculation without these assumptions. An accompanied nomogram makes the process of calculation even simpler than the processes by usual methods. The relative velocity is discussed on the basis of the experiments hitherto published, and is expressed in a general form so that the necessary coefficients for each particular case can easily be found.抄録全体を表示PDF形式でダウンロード (788K) -
寺野 寿郎1953 年 19 巻 88 号 p. 45-49
発行日: 1953/12/20
公開日: 2008/03/28
ジャーナル フリーThe transient characteristics of boiler is very important for the steady operation of boiler and for the synthesis of A. C. C., In the previous paper(4), the auther analyzed A. C. C. problem and gave the optimum setting values of controller. In this paper, he researched by experiments the carrelation of the boiler pressurelor for the steam demand, fuel supply and the quantity of feed water. As a result, the previous calculation exactly coincided with the experimental values. And it is a Known fact that the combustion time constant (Tf) of boiler was always contant and was about 30 second for oil burning and about 1 minute for coal burning, regardless of the steam demand and the magnitude of diturbance.抄録全体を表示PDF形式でダウンロード (750K)
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