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ISSN Online: 2377-424X

ISBN CD: 1-56700-226-9

ISBN Online: 1-56700-225-0

International Heat Transfer Conference 13
August, 13-18, 2006, Sydney, Australia

HIGHER HEAT TRANSFER EFFICIENCY IN LAMINAR STRUCTURED BOUNDARY LAYERS THAN IN TURBULENT BOUNDARY LAYERS

Get access (open in a dialog) DOI: 10.1615/IHTC13.p20.50
12 pages

Résumé

Unexpected behavior has been observed in heat transfer on a concave boundary layer at a low free-stream velocity, a configuration surprisingly ignored in the literature. The boundary layer is laminar with very strong embedded Görtler vortices. Precise measurements of the wall heat transfer in this situation demonstrate that heat transfer enhancement was extremely large, above even that in the turbulent flat-plate case. Analysis demonstrates that the boundary-layer transition is dominated by the centrifugal instability at a free-stream velocity below a critical value. Further results reinforce the discussion by analysis of the influence of forced upstream perturbations coupled with a set of flow visualizations. Heat transfer correlations are based on a genetic algorithm, a powerful tool in these complex heat-transfer situations.