Transactions of the Japan Society of Mechanical Engineers
Online ISSN : 2185-9485
Print ISSN : 0029-0270
ISSN-L : 0029-0270
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Volume 22, Issue 121
Displaying 1-11 of 11 articles from this issue
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  • Formula relating to the Pipeline Transportation of Solids by Fluid Streams
    Kikaku IKEMORI
    1956 Volume 22 Issue 121 Pages 629-630
    Published: September 25, 1956
    Released on J-STAGE: March 28, 2008
    DOIhttps://doi.org/10.1299/kikai1938.22.629
    JOURNAL FREE ACCESS
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  • Pressure Drops in Vertical pipe Line of pneumatic granular-body conveyor : Studies on pneumatic conueyance of granular-body
    Sachio HARADA, Susumu ICHIGE, Haruo NAMAI, Akira TACHIBANA
    1956 Volume 22 Issue 121 Pages 631-636
    Published: September 25, 1956
    Released on J-STAGE: March 28, 2008
    DOIhttps://doi.org/10.1299/kikai1938.22.631
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    The pressure drops, when the velocity of particles accelerated by the air current increases from zero to the terminal velocity while passing through a vertical pipe, were observed and photographed. The experimental apparatus is shown in Fig.1. The results are shown in Fig.2∼Fig.9, inclusive. The pressure drops at the lower pipe, where the particles are mixed, are particularly large, which cannot be negleted when the system is design. We have explained the results theoretically by our way in which we classified pressure drops into three parts, that is, the pressure drop due to accelerating particles, that due to the fiction loss of air and the static pressure difference.
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  • On the Shock Loss in the Flow through Thin Flat Plate Cascades
    Masakichi ISHIKAWA, Naomichi HIRAYAMA, Toshiyuki MAEDA
    1956 Volume 22 Issue 121 Pages 637-642
    Published: September 25, 1956
    Released on J-STAGE: March 28, 2008
    DOIhttps://doi.org/10.1299/kikai1938.22.637
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    "The Shock Loss" means the loss causd by the abrupt change of flow direction at the entrance of a blade cascade. The features of the shock loss are studied for cascades of simple thin flat blades. As a result, conventional formulae which have been used for calculating the shock loss are found not to be valid except for the case where the pitch/chord ratio is less than 0.4 and, at the sametime, the angle of incidence is positive. Moreover, the pressure distributions on the surfaces of the blades are measured, and the lift- and drag-coefficients are calculated.
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  • Study on Surging of Blower (2nd Report)
    Hidetoshi KUSAMA, Shigeru TSUJI
    1956 Volume 22 Issue 121 Pages 642-648
    Published: September 25, 1956
    Released on J-STAGE: March 28, 2008
    DOIhttps://doi.org/10.1299/kikai1938.22.642
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    In this report we studied theoretically and experimentally the prevention of the surging of blowers. We showed that we could make a steady running at any capacity by the method of "two-valve operation" within surging limit. Then, we illustrated that both theoretical and experimental values would show a quantitative accord, where the deviation was within an experimental error. Moreover, we scrutinized "two-valve operation" for safety running of blowers, and we, above all, studied the following subjects to utilize this operating method for the practical use : 1) the relation between the volume of the space between valves 1 and 2 and the surging limit, 2) allowable range of the value of head loss of the valve 1 to prevent the surging within surging limit. 3) the influence of the piping condition and the wheel speed.
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  • Studies on the Flow of Liquid containing Bubbles in the Pipes (1st Report)
    Shigeru ITO
    1956 Volume 22 Issue 121 Pages 648-653
    Published: September 25, 1956
    Released on J-STAGE: March 28, 2008
    DOIhttps://doi.org/10.1299/kikai1938.22.648
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    In the flow of the liquid containing the bubbles such as in the boiler pipe or air lift pump, the frictional resistance and other quantities take very complicate manners due to the relative velocity between the liquid and the bubbles. An experimental apparatus was constructed with two vertical and two horizontal pipes forming a loop of oblong shape, to measure the pressure difference which induces the flow of circulation, and the frictional resistance of the water containing bubbles. The results of the experiments reveals that the relative velocity of the water and the bubble is a function of the denseness factor K of the bubbles only, which is the volume ratio of the bubbles to the whole water at any moment and specified position and that the frictional coefficient of the flow is another function of K within the range K<0.5 and K>0.5.
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  • Studies on the Flow of Liquid containing Bubbles in the Pipes(2nd Report) : A Case of Flow in the Double Pipe
    Shigeru ITO
    1956 Volume 22 Issue 121 Pages 654-658
    Published: September 25, 1956
    Released on J-STAGE: March 28, 2008
    DOIhttps://doi.org/10.1299/kikai1938.22.654
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    An experiment was conducted on the double pipe, which consisted of the experimental apparatuses mentioned in the 1st report, and the annular space, into which air was blown, was made the upriser and the inner pipe, the downcomer. We got the same results as those of the 1st report qualitatively, but a little different quantitatively due to the fact of the difference of single pipe and double pipe and the change of methods of blowing of the air. The frictional coefficient λ for the flow is expressed in this case as κΨ(K)=(λ-λ0)υ1, 2/4m, in which Ψ is a function of K, m is hydraulic mean depth, λ0 is 0.045 which corresponds to large Reynold's number for the range of serious agitation by the air bubbles, K is the denseness factor of the bubbles.
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  • Studies on the Flow of Liquid containing Bubbles in the Pipes (3rd Report) : A Case of Blowing the Air from the Pipe Wall
    Shigeru ITO
    1956 Volume 22 Issue 121 Pages 659-662
    Published: September 25, 1956
    Released on J-STAGE: March 28, 2008
    DOIhttps://doi.org/10.1299/kikai1938.22.659
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    In the case of the 1st report, the air bubbles were blown in from the bottom of the upriser. We found, however, that the method of blowing-in of the air had a serious effect on the results, so we blew the air bubbles into the pipe through the radial holes made on the pipe wall near the bottom. We fonud from the experimental results that the mechanism of the flow was approximately the same as before, and also the effects of the method of blowing the air into the pipe were made clear. The relation between the frictional coefficient λ for the flow and the denseness factor K of the bubbles is κψ(K)=(λ-λ0)υ<1, 4>/d for the range K<0.6, where υ is flow velocity, ψ is a function of K, d is diameter of the pipe, λ0 is 0.195 which corresponds to the large Reynold's number for the range of serious agitation by the air bubbes, K is denseness factor of the air bubbles.
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  • On Vibration of an Incompressible, Viscous Fluid contained in a Space between Two Concentric Cylindrical Walls
    Fumiki KITO
    1956 Volume 22 Issue 121 Pages 663-667
    Published: September 25, 1956
    Released on J-STAGE: March 28, 2008
    DOIhttps://doi.org/10.1299/kikai1938.22.663
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    In an annular space bounded by two concentric cylindrical walls, an incompressible and viscous fluid is supposed to be filled up. The authour has made a theoretical calculation of (vibratory) fluid pressure, which is caused by the vibration of the inner cylindrical wall, In order to avoid too much complication of the calculation, the breadth of annular slit was assumed to be small in comparison with the diameters of the cylinders. The result of calculation is summed up in a formula of simple form, coefficients contained therein being shown in the shape of graphs, for easy estimation.
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  • Turbulent Boundary Layer in Diverging Flow(4th Report) : A New Method for Estimating Turbulent Boundary Layers
    Yoshimasa FURUYA
    1956 Volume 22 Issue 121 Pages 667-673
    Published: September 25, 1956
    Released on J-STAGE: March 28, 2008
    DOIhttps://doi.org/10.1299/kikai1938.22.667
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    This is a new method for estimating turbulent boundary layer in adverse pressure gradient. By substituting the power furmula tor the universal velocity distribution near the wall, or the so-called wall laws, the author advances a rational and consistent theory treating with the effects of pressure gradients on wall friction and on velocity profile. Light is thrown on the problem, revealing the reason why other theories heretofore advanced have been limited. Results reached by this new method show an agreement with experiments for which no other theory has been suited.
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  • Leakage of Air through Labyrinth Packing (On the Straight-through Type) 3rd Report
    Kazunari KOMOTORI
    1956 Volume 22 Issue 121 Pages 674-680
    Published: September 25, 1956
    Released on J-STAGE: March 28, 2008
    DOIhttps://doi.org/10.1299/kikai1938.22.674
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    In the two previous papers, the experimental results of the leakage of air through the labyrinth packing of straight-through type, especially of the relations between leakage, pitch of constrictions and the shape of pockets were reported. In this paper, however the following two items are studied basing on experiments which were carried out in a similar way : (1) on the various shapes (triangular and serrated) of pocket, especially on the effects of their depths. (2) On the optimum design when the total length of the labyrinth packing has been given.
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  • Study on the Low Pressure Jet Apparatus
    Kinichi TORIKAI
    1956 Volume 22 Issue 121 Pages 681-685
    Published: September 25, 1956
    Released on J-STAGE: March 28, 2008
    DOIhttps://doi.org/10.1299/kikai1938.22.681
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    Author analysed the problems of injector and ejector, which consist of low pressure jet and mixing part, in wide range. Especially, the efficiency in mixing part of this apparatus, which is straight part or tube, was discussed, and the theoretical efficieney in mixing part showed very simple curve in ηth-β (ηth is theoretical efficiency in mixing part, and β is {1+(M-1)γj/γs}/B. Where M is mass ratio, B is area ratio, γj is the weight of the jet fluid per unit volume in jet fluid, and γs is the weight of the sucked-in fluid per unit volume. Then author discussed combined jet apparatuses which consist of many jets or mixing part, and explained their efficiency.
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