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Abstract
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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.
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