HEAT-TRANSFER DUE TO STAGNATION POINT FLOW OF A NON-NEWTONIAN FLUID

Heat transfer analysis for steady, laminar flow of an incompressible, homogeneous, non-Newtonian fluid of second grade at a stagnation point is presented. A pseudosimilarity solution is used that enables comput ation of the flow characteristics for any value of the dimensionless n ormal stress modulus, K, of the fluid. The energy equation is discreti zed using central differences, and solved using the Thomas algorithm. A powerlaw variation for the wall temperature is assumed. Results prov ide the effect of non-Newtonian nature of the fluid on the heat transf er characteristics for different values of Prandtl and Eckert numbers, and wall-temperature variation. Results match exactly with those from an earlier perturbation analysis for small K. For large K as well as for the effect of viscous dissipation, no results are available hereto fore. Amongst other applications, the analysis is relevant to the impi ngement of a non-Newtonian jet on a flat surface.