Laminar impingement jet Mach number and temperature effects on heat transfer

A laminar, axisymmetric jet flow of an ideal gas impinging on an infinite flat plate has been studied for various jet exit Mach numbers, jet height to radius ratios, and jet exit temperature to wall temperature ratios by a time-dependent finite-difference method applying the Lax-Wendroff single-step scheme. From the field calculations of temperature and flow, the friction coefficient and Stanton number at the wall are evaluated. Stagnation wall pressures are compared with those behind a normal shock for a supersonic jet and with an isentropic compression for a subsonic jet. All of the flow parameters, the friction coefficient, and the heat transfer are dependent on the jet exit Mach number, the jet height to radius ratio, the jet exit to wall temperature ratio, the Prandtl number, and the jet exit Reynolds number.