On the stagnation point flow of a special class of non-Newtonian fluids

The two-dimensional boundary layer equations for a class of non-Newtonian f luids, for which the apparent viscosity can be expressed as a polynomial in the second scalar invariant of the rate of strain tensor, have been derive d. These equations have been employed to analyse the flow near a stagnation point over a stationary impermeable wall. The non-Newtonian effects on the boundary layer velocity profile and the wall skin friction have been studi ed, and compared with the corresponding Newtonian fluid. The fluid velocity in the boundary layer has been shown to be retarded by the non-Newtonian e ffect while the skin friction increases proportionate to it.