Journal of the Japanese Society for Experimental Mechanics
Print ISSN : 1346-4930
ISSN-L : 1346-4930
Original Papers
[title in Japanese]
Yukio TERAUCHITomoya NAKAJIMAKoji MORIYoshihiko HIGUCHIManabu IGUCHI
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2020 Volume 19 Issue 4 Pages 287-292

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Abstract

   The behavior of an acrylic sphere falling in water contained in a vertical circular pipe subjected to bottom air injection was observed with a video camera and by eye inspection. The flow patterns of air-water two-phase flows thus generated include the bubbly and slug flow regimes. The wettability of the sphere was changed by coating a water repellent material on its surface. The contact angle of the original acrylic sphere was 71° and that of the poorly wetted one was 143°. The terminal velocity of the sphere was measured to make clear the effects of the flow pattern and the wettability of the sphere on the velocity.

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© 2020 The Japanese Society for Experimental Mechanics
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