Abstract

In this study, entropy production (EnG) and natural convection (NC) of magnetic Cu-TiO2-water hybrid nanoliquid in a hexagonal-shaped porous enclosure equipped with two straight hot baffles placed at two sides have been scrutinized. The 4 side walls are considered as adiabatic walls and top and bottom ones are considered as cold walls. The behaviour of hybrid nanofluid (HN) arising from temperature difference between hot baffles (TH) and cold walls (TC) at various Rayleigh and Darcy numbers, porosity of porous medium and different baffles’ length is perused by a numerical simulation method. Governing equations and their related boundary conditions formulated in non-dimensional type with exchangeable baffles’ length using Forchheimer-Brinkman extended Darcy pattern for permeable blocks are solved numerically via FEM. The results reveal that if porosity increases from 0.5 to 0.8, the Nuavg will decrease by 13%. Besides, if the fin length increases from L/16 to L/4, the Nuavg increases up to 86%. This investigation is important for the cases in which the heat transfer enhancement is the main concern.

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