Heat transfer performance study of fluid rotating microchannel heat sink

Abstract

The study presents a novel fluid rotating microchannel heat sink (FR-MC) and reports its heat transfer performance. The FR-MC features two cross ribs positioned in the channel. These cross ribs are inclined in the direction of fluid flow, with each rib inclining in opposite directions. This design enables the fluid to ascend or descend along the ribs, creating rotation after passing through the center to alter the flow direction. Experimental validation confirms the accuracy of the model and numerical simulations. The study investigates the heat transfer capability of FR-MC through comparative analysis, and explores the reasons for the improved performance. The results indicate a 45 % reduction in thermal resistance compared to a rectangular microchannel (R-MC). This improvement is attributed to the rotation of fluid promoting the exchange between the upper and lower parts and the mixing of hot and cold portions, effectively disrupting the thermal boundary layer near the wall. Further exploration into the impact of microchannel dimensions on heat transfer performance indicates that the FR-MC outperforms the R-MC across various heights and widths, achieving thermal resistance reductions ranging from 16 % to 50 %, illustrating the superior heat transfer performance of FR-MC.