Analysis of entropy generation due to conjugate natural convection in an enclosure region has been carried out. A thermal lattice Boltzmann Bhatnagar–Gross–Krook model was implemented to simulate the two-dimensional natural convection and to investigate the effect of the most important parameters, the Rayleigh number and thermal conductivity ratio of solid to fluid . Entropy generation contours due to heat transfer irreversibility, isotherms, streamlines, and Nusselt numbers were obtained and discussed. It was found that dimensionless entropy generation due to heat transfer (Bejan number) decreases with an increasing thermal conductivity ratio. For ranging from to , the total entropy generation is mostly due to heat transfer because of relatively low velocities, but for , the contribution due to fluid friction becomes more effective.
Entropy Generation of Conjugate Natural Convection in Enclusures: The Lattice Boltzmann Method
Journal of Thermophysics and Heat Transfer ; 27 , 3 ; 498-505
2013-07-01
Article (Journal)
Electronic Resource
English