Numerical study of wall heat transfer in the recirculating flow region of a confined jet

Wall heat transfer in the recirculating flow region of a confined jet is studied numerically within the framework of a k-epsilon two-equation model of turbulence (where k is the turbulence kinetic energy and epsilon is its viscous dissipation rate). The numerical analysis is carried out using a finite difference scheme and staggered grid points. Fairly good agreement is obtained between experimental data and the numerical results when modified wall functions for enthalphy are used to account for the nonequilibrium structure of turbulence penetrating into the wall region from the jet shear layer. It is concluded that until a comprehensive method for nonequilibrium turbulence is well established, the present model can be tentatively used for predicting wall heat transfer from flows with a partially reversed flow region.