Journal of Flow Visualization and Image Processing

ISSN for PRINT: 1065-3090

For Online Access

Best Paper Award Selection - Editorial Board Site

2007, Volume14

Issue 4

95 pages

DOI: 10.1615/JFlowVisImageProc.v14.i4

Issue price - $163.00

Shinzaburo Umeda
Department of Architecture and Civil Engineering, Fukuyama University, Gakuen-cho, Fukuyama, Hiroshima, 729-0292, Japan

Shinji Shigeyama
Graduate Student of Civil and Environmental Engineering, Fukuyama University, Gakuen-cho, Fukuyama, Hiroshima, 729-0292, Japan

Hideyasu Tsuji
Kyowakisetsu Company, Shingai-cho, Fukuyama, 721-0955, Japan

Wen-Jei Yang
Department of Mechanical Engineering and Applied Mechanics, University of Michigan, Ann Arbor, Michigan 48109, U.S.A.

Oscillation of a self-excited flip-flop flow, which exhibits multiple, uniform-flow rate jet streams, can be produced in a diamond-shaped cylinder bundle. This study concerns a fluid flowing through a duct stacked with a five-storied diamond-shaped cylinder bundle. Through utilization of the ramming effect, micro- and nano-sized bubbles are generated by supplying air through a pair of tiny holes drilled at each edge area in the narrowest cross section connecting the converging- and diverging-flow regions which are formed by two adjacent diamond-shaped cylinders. Individual nano-sized bubbles as small as 500 nm in the efflux can be visualized and recorded. The number versus diameter distribution is determined using a Multisizer III. Flow rates are varied to determine the effect of through-flow, Reynolds number, on the amount of nano-bubbles generated. The study has important applications in electronics industry as well as in biomedical technology.

DOI: 10.1615/JFlowVisImageProc.v14.i4.50 Download article, 409-416 pages

Article price - $35.00

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