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

ISSN Imprimer: 1065-3090
ISSN En ligne: 1940-4336

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v10.i12.40
18 pages

MECHANISM OF FLOW THROUGH LOUVER-FINNED SURFACES

Wen-Jei Yang
Department of Mechanical Engineering and Applied Mechanics University of Michigan, Ann Arbor, Michigan 48109-2125, U.S.A.

RÉSUMÉ

An experimental study is performed to determine the mechanism of flow through louver-finned surfaces by means of flow visualization and laser Doppler velocimetry (LDV). The louver angle and flow velocities are varied. Results are obtained for the velocity vector, turbulence intensity, Reynolds stress, and power spectrum together with images of flow patterns in both the fin and louver spaces. It is disclosed that an increase in the louver angle promotes enhancement in mixing performance but the appearance of a separation bubble in the vicinity of louver-fin connection bend limits the louver angle. Large longitudinal vortices are induced in flow through all louvered fins. The uniqueness of the louver-finned system is its arched geometry which serves as a curvature producing the centrifugal force for the enhance mixing performance. Applications of such a system are abundant in compact heat exchange devices most well known in automotive radiators.