Journal of the Visualization Society of Japan
Online ISSN : 1884-037X
Print ISSN : 0916-4731
ISSN-L : 0916-4731
Flow Instability in Diverging-Flow Region with Flip-Flop Phenomenon inside Diamond-Shaped Cylinder Bundles
Shinzaburo UMEDASeizou HASEGAWAAkira TANIGUCHIWen-Jei YANG
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2003 Volume 23 Issue Supplement1 Pages 141-144

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Abstract
The authors explained the mechanisms that caused the reciprocating bubble migration with flip-flop phenomenon in a diamond-shaped cylinder bundle. However, it lacks sufficient, quantitative explanation due to complexity in these flows. An experimental study is performed to determine flow instability in the diverging-flow region with flip-flop phenomenon inside diamond-shaped cylinder bundles. The velocity variations in their flow fields were measured using two-dimensional laser Doppler velocimetry(LDV). The study leads to the following disclosures in the diverging region with flip-flop phenomenon: (i) Power spectrum distribution with identical dominant frequency prevails in every row, indicating flow oscillations propagate over the entire passage. (ii) At the third row, the magnitude of power spectra reaches maximum near the "energy supply point", but subsequently diminishes to the minimum value at the apex of the succeeding cylinder. (iii) The flow exhibits the characteristics of a edge tone.
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