Transient study of buoyancy-assisted mixed convection in laminar plane wall jet flow

A numerical investigation of two-dimensional transient buoyancy-assisted laminar plane wall jet flow has been conducted. The governing equations in the stream function-vorticity formulation have been solved by alternating direction implicit (ADI) method. The parameters used are Grashof number 104 − 107, Prandtl number 0.01, 0.71, 7.1, 10.0 and 15.0 with a constant Reynolds number 400. The plate is considered at a higher temperature and the fluid is assumed to be initially at a uniform cold temperature. The streamline, u-velocity and the isotherm contours are presented at different time levels. The time required for the average Nusselt number to attain a steady-state value decreases with increase in Grashof number.