Enhancement of Heat Transfer From Extended Surfaces by CFD

Abstract

Theoretical studies and analysis of heat transfer from a rectangular extended surfaces and a pin finned plate studied to calculate the average Nusselt number in parallel, vertical direction placed along the sidewall. The total rise of the mean Nusselt number is noticed around 36% for pin finned plate with respect to a plain plate. This is examined with optimal fin spacing of Sv with L ratio equals to 0.2 and Sh with W ratio equals to 0.25, height of extended surfaces 24 mm (Height to thickness ratio 8), and 45o angle of inclination . The mean Nusselt number decreases with rise in angle of inclination and also increases with rise in aspect ratio. Present study reveals that in-line and staggered arrangements do not yield appreciably different results.The maximum average Nusselt number difference between conductive and non-conductive fins is around 5 % for Sh/W= 0.33, Sv/L =0.2 at θ = 45°, fin height of 6 mm (H/t=2).