Numerical Study on the Effect of Rib Configurations on the Thermal-Hydrodynamic Performance of Microchannel Heat Sink

In the current paper, novel microchannels heat sink (MCHS) with ribs and filleted rib corner designs are investigated numerically. Microchannel with square ribs (MC-SQ), MCHS with square ribs and corner with fillets (MC-SQ-FR), and MCHS with square ribs and corner with double fillet (MC-SQ-DFR) are the three designs that are considered. CFD package Ansys Fluent was used to accomplish 3-D numerical solution. Thermohydraulic performance of this configuration is assessed by analyzing their Nusselt numbers, pressure drop, base temperature, etc. According to the findings, the fillet of the rib corner significantly raises the thermal performance while just slightly raising the pressure drop. In comparison to MC-SQ, MC-SQ-FR improves the Nusselt number by 15–22% and raises the pressure drop by 2–10%, respectively. Additionally, the MC-SQ-FR configuration outperformed all others due to the redevelopment of the thermal boundary layer and increased mixing level.