COBEM99

SR27 Transferência de Calor e Massa

Title:

NATURAL CONVECTION IN A POROUS CAVITY USING THE GENERALIZED MODEL WITH UNIFORM POROSITY

Summary :

ABSTRACT. THIS STUDY PRESENTS A NUMERICAL INVESTIGATION OF CONVECTIVE HEAT TRANSFER IN A RECTANGULAR POROUS CAVITY USING THE GENERALIZED MODEL WITH UNIFORM POROSITY BASED ON THE BRINKMAN AND FORCHHEIMER MODELS IN NAVIER-STOKES EQUATIONS WHICH ARE APPLIED TO AN INTERVAL INVOLVING DARCIAN AND NON-DARCIAN REGIMES. RESULTS ARE PRESENTED THROUGH TEMPERATURE AND VERTICAL VELOCITY PROFILES AS WELL AS THE AVERAGE NUSSELT NUMBER CALCULATED IN THE VERTICAL WALLS OF THE CAVITY. THESE RESULTS WERE COMPARED WITH OTHER NUMERICAL STUDIES , VERIFYING A GOOD AGREEMENT. IT WAS ALSO PROPOSED A CORRELATION IN ORDER TO CALCULATE THE AVERAGE NUSSELT NUMBER AT FIVE DIMENSIONLESS PARAMETERS, SUCH AS: ASPECT RATIO, RAYLEIGH NUMBER, DARCY NUMBER, PRANDTL NUMBER AND THE POROSITY. IT WAS OBSERVED A DISCREPANCY ABOUT 30% IN RELATION TO THE SIMULATED RESULTS. KEY-WORDS: NATURAL CONVECTION, POROUS MEDIUM, UNIFORM POROSITY, DARCIAN AND NON-DARCIAN REGIMES.

Author :

Gurgel, José Maurício 0
Marcondes, Francisco 0
Medeiros, Jesus Marlinaldo

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