OPTIMUM PLATE SEPARATION IN VERTICAL PARALLEL-PLATE CHANNELS FOR NATURAL CONVECTIVE FLOWS - INCORPORATION OF LARGE SPACES AT THE CHANNEL EXTREMES

This paper addresses the problem of optimizing the plate separation of an open, parallel-plate channel that is cooled by natural convection air Bow. The plates are symmetrically heated by uniform heat flux. The I-shaped computational domain comprised two subdomains: the actual ph ysical domain between the plates, and two large rectangular reservoirs placed upstream of the entrance and downstream of the exit. The aggre gate subdomains accommodated the diffusion phenomena by momentum and e nergy that occur outside the channel. The full elliptic Navier-Stokes and energy equations are solved numerically in the composite domain. C orrelations of the optimal values of the plate spacing as a function o f the Gr(L) number and of the induced mass flow rate, as well as therm al and velocity profiles, are presented for air. Copyright (C) 1996 El sevier Science Ltd.