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Journal of Enhanced Heat Transfer
IF: 0.562 5-Year IF: 0.605 SJR: 0.175 SNIP: 0.361 CiteScore™: 0.33

ISSN Print: 1065-5131
ISSN Online: 1026-5511

Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.v8.i6.10
pages 353-371

An Experimantal Study of Convective Heat Transfer Enhancement in a Grooved Channel Using Cylindrical Eddy Promoters

Cila Herman
Department of Mechanical Engineering, The Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218, U.S.A.
Eric Kang
Department of Mechanical Engineering, The Johns Hopkins University, Baltimore, Maryland, USA

ABSTRACT

We visualize oscillating temperature fields in the grooved channel with cylindrical eddy promoters using real-time holographic interferometry combined with high-speed cinematography. Flow transition from stable, laminar to oscillatory occurs around Re = 450. The addition of cylindrical eddy promoters improves the mixing and heat transfer across the shear layer at the groove lip. Vortices shed downstream of the cylinders induce oscillations more vigorous than do the self-sustained Tollmien-Schlichting waves alone in the more stable situation in the basic grooved channel. For Reynolds numbers ranging from 790 to 1580, the experimentally determined Nusselt numbers for the grooved channel with cylinders are roughly twice the magnitude of those measured for the basic grooved channel. The cylinder provides a flow obstruction, forcing the fluid to accelerate through the constriction between the block and the cylinder, effecting larger local Nusselt numbers along the trailing edge of the block's top surface. Pressure drop data suggest that for Re < 1000 the pressure drop penalty in the enhanced geometry is only moderately higher than for the basic grooved channel.


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