Sharif University of Technology Scientia Iranica 1026-3098 Articles in Press 2024 01 27 Entropy generation analysis of hybrid-nanofluid during natural convection through two coaxial cylinders partially filled with porous medium under magnetic field 23495 10.24200/sci.2024.62997.8159 EN Y. Foukhari Research laboratory in physics and sciences for engineering, LRPSI Sultan Moulay Slimane university, Polydisciplinary faculty, Beni Mellal, 23000, Morocco M. Sammouda Research laboratory in physics and sciences for engineering, LRPSI Sultan Moulay Slimane university, Polydisciplinary faculty, Beni Mellal, 23000, Morocco M. Driouich Research laboratory in physics and sciences for engineering, LRPSI Sultan Moulay Slimane university, Polydisciplinary faculty, Beni Mellal, 23000, Morocco Journal Article 2023 08 29 The aim of this research is to analyze the magneohydrodynamic heat transmission in an<br />annular space partially porous between two coaxial cylinders with a permeable interface saturated by a hybrid nanofluid (water-Cu/Al2O3) and study the entropy generation to better<br />understand the heat transfer processes. The inner and outer cylinders are kept at a constant<br />hot and cold temperature. The base walls are designed to be impermeable and insulated. A<br />finite difference-based vorticity-stream function is used to solve the nonlinear coupled conservation equations using Successive Over Relaxation approach. The obtained numerical outcomes<br />in terms of streamlines, isotherms, Nusselt and Bejan numbers, and entropy generation are presented to demonstrate the effect of various control parameters. The findings of this numerical<br />simulation show that the increase in the Ra number improves the thermal energy transmission<br />across the active wall. Further, a rise in nanoparticle concentration causes a rise in thermal conductivity, which contributes to enhancing the heat transfer rate. In addition, the mean entropy<br />generation elements rise with increasing Rayleigh number, Darcy number, and nanoparticle<br />concentration; however, with the exception of magnetic irreversibility, the reverse development<br />is detected. Furthermore, the Bejan number is reduced in order to increase the Rayleigh and<br />Darcy numbers. https://scientiairanica.sharif.edu/article_23495_0f92d12358dcc564f7a35812a315e460.pdf