NUMERICAL SIMULATIONS FOR THE ANALYSIS OF ENTROPY GENERATION DURING NATURAL CONVECTION IN POROUS RHOMBIC ENCLOSURES

Entropy generation analysis has been introduced to investigate the effectiveness in heat transfer during natural convection within porous rhombic enclosures of various inclination angles phi for differential (case 1) and Rayleigh Benard (case 2), heating situations. The results are presented in terms of streamlines (psi), isotherms (theta), and entropy generation maps (S-theta and S-psi). Entropy production on the basis of various heating patterns and geometrical orientations have been reported based on the relation between total entropy generation (S-total) and average Nusselt number (Nu) over bar (l) or (Nu) over bar (b)) via Bejan Number, which relates the available thermal energy to irreversibilities.