TED-AJ03-540 MIXED CONVECTION IN THE THERMAL ENTRANCE REGION OF UPWARD OR DOWNWARD AIR-FLOW BETWEEN INCLINED PARALLEL PLATES WITH UNIFORM WALL TEMPERATURE

概要

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Numerical analyses have been conducted on the effect of buoyancy on pure forced convection of the upward or downward air-flow in the thermal entrance region between inclined parallel plates with uniform wall temperature. The governing equations using the usual Boussinesq approximation are solved for the Symmetrically and asymmetrically heated parallel plates. Numerically predicted friction factors C_<ƒ> and Nusselt numbers (Nu)_x for various inclination angles of parallel plates are compared with their counterparts, C^*_<ƒ> and (Nu)^*_x, for pure forced convection. The correlation equations of C_<ƒ>/ C^*_<ƒ> and (Nu)_x/(Nu)^*_x versus Ra, Re, and inclined angles ∅ for two flow types and three thermal conditions were deduced from the numerical results to show the behavior of buoyancy in the thermal entrance region. These correlation equations are shown with the solid lines in Figures A-1 and A-2. Furthermore, the critical value of (Ra)_c or (Re)_c and inclination angle ∅ for the flow reversal is reported to be able to infer from the correlation equation of (C_<ƒ>/ C^*_<ƒ>)_<min>[figure]
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