A CFD parametric analysis of natural convection in an H-shaped cavity with two-sided inclined porous fins, By Hossein Rahideh

Research

Title	A CFD parametric analysis of natural convection in an H-shaped cavity with two-sided inclined porous fins
Type	Article
Keywords	H-shaped cavity Inclination angle Natural convection Porous fins Darcy number Aspect ratio
Journal	Journal of the Taiwan Institute of Chemical Engineers
DOI	10.1016/j.jtice.2020.09.011
Researchers	Fatemeh Keramat (First researcher) , Ahmad Azari (Second researcher) , Hossein Rahideh (Third researcher) , Mohsen Abbasi (Fourth researcher)

Abstract

The performance of bilateral inclined solid and porous fins in natural convection within an H-shaped cavity with a hot bottom wall, cold vertical walls, and insulated horizontal walls are numerically investigated in this work. The key factors, namely Rayleigh number (Ra = 103 105), the porosity of fins (e = 0 1), Darcy number (Da = 1010 102), inclination angle of fins (a = 68o,90o,112o), and the aspect ratio of the cavity (AR = 0.1, 0.2) are analyzed comprehensively in 180 cases. Porous zone governing equation and buoyancy force within the cavity are implemented by volume-average theory and Boussinesq approximation, respectively. A 60% enhancement in mean Nusselt number is observed in the presence of porous fins compared to the solid fins. The maximum Nusselt number is obtained by the perpendicular fins (a = 90o) and the aspect ratio of (AR = 0.2). In addition, the fins with the Darcy numbers (Da < 106) behave like solid fins. Finally, two correlations between the significant parameters and average Nusselt number are presented.