EFFECTS OF SURFACE RADIATION ON TURBULENT FREE-CONVECTION IN AN OPEN-ENDED CAVITY

A numerical study is carried out for the steady turbulent free convect ion in a two-dimensional open square cavity with and without surface r adiation. The flow medium is air, and the used turbulence model is the Low-Reynolds-Number k - epsilon scheme taking into account the buoyan cy and variable property effects. The velocity, temperature and turbul ent kinetic energy fields, the averaged Nusselt numbers and the radiat ion portion in combined heat transfer at different overheat ratioes an d Rayleigh numbers are presented and discussed to demonstrate the radi ation effects on the turbulent flow and heat transfer characteristics.