NUMERICAL PREDICTS of FLOW AND HEAT TRANSFER in JOULE-HEATED RECTANGULAR POOL

Based on the Joule heating nuclear waste treatment technology, a series of numerical simulations have been studied to predict transient flow and heat transfer.The physical model is a rectangular cavity filled with fluid, the direct current contributes heat for heating the process medium by a pair of plate electrodes. For Pr=1 fluid, the thermally driven stable convection and the electromagnetically driven stable flow can be observed respectively or both gravitationally and electromagnetically driven stable convection exhibit. The threshold Hartmann number for the flow transition from an asymmetric 2 cells steady flow to a steady non-asymmetric state 1 roll flow is 159.687, where the Nusselt number exhibits a minimum value. And the second transition from non-asymmetric state 1 roll flow to a steady asymmetric 2 rolls flow is fixed at 178.88 with Ra=1.0x10(5). The results can provide some guidelines for conceptual thermal control for Joule heated ceramic melter technology.