This research presents the numerical analysis of heat transfer and friction loss in a multi-louvered fin for compact heat exchangers. Low Reynolds numbers of 50 to 250 (based on the louvered pitch and inlet velocity) are chosen because the characteristic length is small. The global and local heat transfer, and friction loss for a base case of louvered fin geometry are investigated. The effects of louvered angles and fin pitches on heat transfer and friction loss are also studied. It is found that the physical mechanism at low Reynolds numbers is quite different from those at high Reynolds numbers. The flow rate plays an important role in overall heat transfer since the flow in this multi-louvered fin system at low Reynolds numbers resembles an developing channel flow. Wake interference is also an important factor for the overall performance of a multi-louvered fin system.
Return to Wanlai Lin's Home Page: