Entropy Generation of Double Diffusive Natural Convection in a Three Dimensional Differentially Heated Enclosure

Authors

1 Department of Energy, National Engineering School of Monastir

2 génie Energétique, Ecole Nationale d'Ingénieurs de Monastir

3 genie Energetique, Ecole Nationale d'Ingenieurs de Monastir

4 energy department, National Engineering School of Monastir

Abstract

Entropy generation of double diffusive natural convection in a three dimensional differentially heated enclosure has been performed numerically. Vertical walls of enclosure are heated differentially and remaining walls are adiabatic. The obtained results were presented via iso-concentration, iso-temperatures, velocity vector projection, particle trajectories, velocity profiles, iso-entropy, local Nusselt and Sherwood numbers, average Nusselt and Sherwood numbers and Bejan numbers at different value of buoyancy ratio (-2 ≤ N ≤ 2) and Rayleigh numbers (103≤ Ra ≤ 105). The Lewis number is fixed at Le = 2. It is found that both Rayleigh number and buoyancy ratio play dominant role on entropy generation and heat and mass transfer as well as fluid flow. A special case occurred between -1.5 ≤ N ≤ -1 and complex structure is observed.

Keywords