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

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

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v3.i2-3.100
pages 237-246

SECONDARY FLOW PHENOMENA IN A ROTATING RADIAL STRAIGHT SQUARE CHANNEL

K. C. Cheng
Department of Mechanical Engineering, University of Alberta Edmonton, Canada
Liqiu Wang
School of Chemical Eng., Dalian University of Technology, Dalian, 116012, P.R. China

ABSTRAKT

Flow visualization results for secondary flow phenomena near the exit of a rotating radial straight square channel are presented to study Coriolis instability phenomena (formation of Coriolis vortices) and early laminar-turbulent transition for developing laminar flow regime with Reynolds numbers Re = 500 and 1500 and rotating speeds n = 20 ∼ 313 rpm. The smoke injection method was used for flow visualization. At lower Reynolds numbers, the channel rotation (Coriolis force) has a destabilizing effect. This is in contrast to the stabilizing effect of centrifugal force in curved channel flow. The flow visualization results are compared with the results of numerical solutions reported in the literature. The practical implications of the visualization study for future theoretical and experimental investigations are pointed out.