Journal of the Society of Mechanical Engineers
Online ISSN : 2433-1546
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Volume 28, Issue 95
Displaying 1-4 of 4 articles from this issue
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  • THE MOTION OF AN AIR BUBBLE RISING IN WATER
    Otogoro MIYAGI
    Article type: Article
    1925 Volume 28 Issue 95 Pages 97-128
    Published: 1925
    Released on J-STAGE: August 01, 2017
    DOIhttps://doi.org/10.1299/jsmemagazine.28.95_97
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    Air bubbles of various sizes moving up in still water are carefully treated experimentally and then theoretically. Their terminal velocities are determined in relation to their sizes, and the changes of their shapes during their motion are investigated. The mass of water carried up with a moving bubble and the resistance to its motion are determined, and the most probable equation of motion is proposed. It is also proved that there are two different kinds of motion of a bubble in water exactly analogous to the stream-line and the turbulent flows of a viscous fluid, which passes from the one to the other distinctly at the ctitical radius of the bubble.
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  • [title in Japanese]
    [in Japanese]
    Article type: Article
    1925 Volume 28 Issue 95 Pages 129-136
    Published: 1925
    Released on J-STAGE: August 01, 2017
    DOIhttps://doi.org/10.1299/jsmemagazine.28.95_129
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    When the lateral forces such as wind pressures, centrifugal forces &c act on a railway vehicle, the pressure of wheels on rails will increase on the one side and diminish on the other. When a wheel of a vehicle passes over a weak spot on the rail along the oneside, the pressure of that along the other side will either increase or decrease. Such increments of wheel pressure are worth while careful consideration and the increments are greater in the case of narrow gauge railways than in the case of broad ones. Therefore it follows that the admissible axle loads of vehicles of a narrow gauge railways must be lower than that of broad ones, on condition that the permanent ways are of the same strength and that the vehicles are of the same size. It may also be stated that the use of sharp curves must be restricted more in narrow gauge railways than in broad ones, if the vehicles are of the same size. The argument is sometimes raised against broad gauges that the curve resistance will be greater as compared with that in narrow gauges. But this is of less importance, as the curve resistance is affected more by the lengths of wheel base of vehicles rather than the gauge and is also a small fraction of the train resistance in general.
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  • [title in Japanese]
    Article type: Appendix
    1925 Volume 28 Issue 95 Pages 136-
    Published: 1925
    Released on J-STAGE: August 01, 2017
    DOIhttps://doi.org/10.1299/jsmemagazine.28.95_136
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  • [title in Japanese]
    [in Japanese]
    Article type: Article
    1925 Volume 28 Issue 95 Pages 137-152
    Published: 1925
    Released on J-STAGE: August 01, 2017
    DOIhttps://doi.org/10.1299/jsmemagazine.28.95_137
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