Optimization of Two-Step Rectangular Rib Geometries for Enhanced Thermal Performance in Interrupted Microchannel Heat

Abstract

As microelectronic devices continue to increase in power density, efficient thermal management becomes increasingly critical. Traditional microchannel heat sinks often struggle to meet the cooling demands of high-performance systems. This work investigates multi-step rectangular ribs (step count N∈{2,3,4}) in interrupted MCHS and optimizes the two-step topology. ANSYS Fluent was used to simulate the flow and heat transfer characteristics, with grid independence tests confirming the optimal mesh size. The analysis reveals that rib geometry, including multi-step and two-step rib configurations, significantly influences heat transfer and pressure drop, with optimal configurations identified for different operating conditions. The results demonstrate that optimized rib dimensions enhance heat transfer efficiency while controlling pressure losses, with performance evaluated in terms of the Nusselt number, friction factor, and thermal enhancement factor across varying Reynolds numbers. This work provides valuable insights for the design of advanced microchannel heat sinks in high-performance electronic applications.