Abstract
The paper proposes a new and simple version of the Prandtl mixing length hypothesis for flow past smooth surfaces. The model has been used in obtaining extensive predictions of boundary layers on porous surfaces including flows with steep density and pressure gradients measured in the present study. Very good agreement of predictions with measurements is obtained except in flows in adverse pressure gradients and under conditions of high blowing. In these cases, because of convective transport of turbulence, the level of mixing length in the outer part of the boundary layer does not increase as fast as the boundary-layer thickness.
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