NUMERICAL INVESTIGATION OF FLOW STRUCTURE AND MIXED CONVECTION HEAT TRANSFER OF IMPINGING RADIAL AND AXIAL JETS

Abstract

Mixed convection flow fields and heat transfer of partially enclosed axial and radial laminar jets impinging on a heated flat plate have been investigated from the numerical solution of incompressible unsteady Navier-Stokes and energy equations with a Boussinesq approximation. For mixed convection flow at Re = 200, steady flow has not been observed for either the radial or the axial jet. For the smallest Crashof number (Gr = 10,000), periodic solutions have been obtained. With Gr = 40,000, nonsteady nonperiodic (chaotic) flow appears. Free convection may increase the heat transfer by more than 200 %.