Thermal and entropy analysis in L‐shaped non‐Darcian porous cavity saturated with nanofluids using Buongiorno model: Comparative study
Ali J. Chamkha, Ghasem Jomardiani, Muneer A. Ismael, Ramin Ghasemiasl, Taher Armaghani
Source abstract
The current paper deals with the natural convection and entropy generation in L‐shaped porous cavity filled with nanofluids obeying Buongiorno's two‐phase model. Forchheimer–Brinkman‐extended Darcy model is used to represent the macroscopic motion within the porous medium. The governing equations are solved using the finite volume method using OpenFoam software. We have added a house code in C++ to OpenFoam solver for reaching to the Buongiorno's two‐phase model and entropy generation. By alternative considering and ignoring, the roles of Brownian motion and the thermophoresis mechanisms are examined. A comparative study is carried out on these aspects based on the thermal performance criterion. The results show that the thermophoresis diffusion effect is predominant over the Brownian diffusion effect. The Nusselt number and the total entropy generation are higher for svelte cavity. A cavity of aspect ratio of 0.5 and Al 2 O 3 and CuO nanoparticles are proposed for best thermal performance.
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