Analysis of energy management via entropy generation approach during natural convection in porous rhombic enclosures

► Rhombic cavities may find applications in efficient electronic cooling and geothermal reservoirs. ► Rhombic cavities have been chosen for analysis due to its suitability in geometrical orientations. ► Detailed analysis of fluid flow, temperature distribution and entropy generation maps are done. ► Average Nusselt number (Nu¯) vs. optimal entropy generation (Stotal) have been analyzed in detail. ► Optimal conditions are found via minimum entropy generation vs maximum heat transfer rate.