Laminar mixed convection boundary layer flow induced by a permeable surface stretched with prescribed skin friction boundary conditions:

摘要

The mixed laminar boundary layer flow and heat transfer on a permeable stretched surface moving with prescribed skin friction are studied. Three major cases, which correspond to complete similarity solutions, are considered. The cases are combinations of power law indices n and m representing temperature and skin friction distributions, respectively. The first case (n?=?0, m?=?0.5) corresponds to isothermal stretched surface with skin friction at the surface scales as x1/4. The second case (n?=?1, m?=?1) is a linear temperature and skin friction distribution along the vertical stretched surface. The third case (n?=??1, m?=?0) represents inverse temperature variation along the surface with prescribed skin friction of the order of x?1/2. Similarity solutions are obtained for the surface stretched in a stagnant air with Prandtl number?=?0.72. The effect of suction/injection velocity (fw) and the buoyancy parameter (λ) is studied in detail. The results show that the heat transfer coefficient along the surface...