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Journal of Flow Visualization and Image Processing
SJR: 0.161 SNIP: 0.312 CiteScore™: 0.1

ISSN Print: 1065-3090
ISSN Online: 1940-4336

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v8.i1.60
11 pages

COMPARISON OF WAKE FLOWS BEHIND SQUARE AND CIRCULAR CYLINDERS

ABSTRACT

Our previous study revealed the occurrence of flip-flop phenomena in the exit streams from diamond-shaped cylinder bundles, something that has never been observed in circular cylinder bundles. This motivates us to investigate the basic difference in wake flows behind single-square (a special diamond-shaped quadruple) and circular cylinders. Two kinds of experiments were performed: flow visualization and two-dimensional laser Doppler velocimetry (LDV). The former yields flow patterns by means of a fluorescence dye injection illuminated by a laser light sheet. The LDV experiment produces velocity vector distributions, from which the distribution of vorticity, turbulence intensity, and Reynolds stress can be derived.