Mixed convective heat transfer from vertical fin array in the presence of vortex generator

Abstract

Vortex induced non-Boussinesq laminar mixed convective heat transfer in a shrouded vertical non-isothermal fin array has been investigated numerically taking into account the variable transport properties. Computations are performed for the parametric range: Grashof number=4.3–8.4×105, Reynolds number=1280–2667, dimensionless fin spacing=0.2–0.5 and dimensionless clearance=0.0–0.25. Computations demonstrate inclusion of vortex generator results in a rise of pressure drop across the duct length to a value as high as 150% which is compensated by the substantial enhancement in heat transfer, as high as 200% locally and 20% globally compared to without vortex generator. Finally, overall Nusselt number is well correlated with the governing parameters of the problem.