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ISSN Online: 2377-424X

ISBN Print: 0-89116-299-2

International Heat Transfer Conference 7
September, 6-10, 1982, Munich, Germany

CALCULATION OF HEAT TRANSFER IN TURBULENT TRANSPIRED BOUNDARY LAYERS

Get access (open in a dialog) DOI: 10.1615/IHTC7.1840
pages 275-281

Résumé

Calculations have been performed to assess the relative performance of two recently proposed near-wall turbulence models, namely the one-equation model of Norris and Reynolds [3] and the two-equation model of Lam and Bremhorst [4]. The testcases, to which the models have been subjected, span a wide range of transpired and non-transpired flow conditions. In particular, the heat transfer behaviour of boundary layers in zero, adverse and favourable pressure gradients has been explored. In addition, cases with step changes in blowing rate were calculated. The comparison with experimental data is mainly in terms of skin friction coefficients and Stanton numbers as well as velocity and temperature profiles and shows that the one-equation model predicts the effects of transpiration on equilibrium boundary layers correctly, but reveals difficulties in reproducing relaminarizing and relaxing flows. On the other hand the two-equation model simulates these features correct. Modifications of the latter are needed, however, in order to improve its performance for equilibrium cases with transpiration and for boundary layers under adverse pressure gradients.