Simulation of Turbulent Natural Convection in a Local Zone of Largescale Area Under Conditions of the Radiant Energy Supply

Abstract

This paper presents the results of mathematical modelling of turbulent natural convection under conditions of the conjugate heat transfer in an open cavity heated by infrared emitter. Two-dimensional problem of heat transfer was formulated in the vorticity - stream function - temperature dimensionless variables and solved by means of the finite difference method on a uniform grid. According to the results of numerical analysis, the fields of differential and integral heat transfer characteristics, illustrating the unsteady nature of the thermophysical process under study, were obtained. The nonlinear dependence of the average Nusselt number versus dimensionless time (tau) was established. It was shown that the average Nusselt number monotonically increased in a range of 800<[tau]<2000.