CFD analysis on heat transfer through different extended surfaces

Abstract

The present study includes computational fluid dynamics analysis and comparison of heat enhancement through different extended surfaces, especially in rectangular and square conductive and nonconductive fins. Computational and numerical analysis of heat transfer from a rectangular extended surface 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% in pin-finned plate with respect to a plain plate. This is examined with optimal fin spacing of S v with L ratio equals to 0.2 and S h with W ratio equals to 0.25, height of extended surfaces 24 mm with 45°angle of inclination. The mean Nusselt number reduces with a rise in the angle of inclination and also increases with a rise in aspect ratio. The present study reveals that inline and staggered arrangements do not yield appreciably different results. The maximum average Nusselt number difference between conductive and nonconductive fins is around 5% for S h per W ratio 0.33 and S v per L ratio 0.2 at an angle of inclination 45°, fin height of 6 mm (height to thickness ratio 2).