A numerical study of a plane wall jet with heat transfer

摘要

A direct numerical simulation (DNS) of a wall jet is performed at Re = 7500. To the authors' knowledge, this is the highest Reynolds number DNS study of a wall jet. The heat transfer process is studied with an iso-thermal boundary condition at the wall. The molecular Prandtl number is Pr = 0.71. Mean flow and heat transfer parameters are contrasted with available measurements and Nusselt number coefficient correlations. The scaling parameters for heat transfer variables are investigated. The mean temperature < T >, temperature root mean square T-rms, streamwise < u'T'> and wall normal < v'T'> heat flux profiles show collapse in the streamwise direction, with the inner scaling, the outer scaling and the thermal scaling parameters. The complete budgets for temperature variance < T'T'> and turbulent heat fluxes are also presented. (C) 2016 Published by Elsevier Inc.