MHD flow and heat transfer at a general three-dimensional stagnation point (Q1367323)

The authors study the hypersonic flow of a viscous electrically conducting fluid in three dimensions, especially in the neighbourhood of a stagnation point where the velocity gradients are arbitrary. The boundary layer over the porous wall of the body is permeated by magnetic field, across the surface the fluid is injected through the pores. The problem is to determine the heat exchange between body and fluid which may be due to viscous and Ohmic heating. The analysis shows that two types of stagnation points can occur, a nodal type and a saddle one. The authors discuss the nature of the back flow at the stagnation points, and evaluate the role of the skin friction. It is shown that the increased blow (through the pores of the body) decreases the heat transfer towards the surface. The calculations are made by using a similarity solution: namely, the resulting equations are solved using an asymptotic solutions as a start, and then the solution is elaborated numerically.