The paper entitled “Numerical investigation of elliptical ribbed manifold microchannel heat sink and multi-objective optimization utilizing machine learning” has been published in Thermal Science and Engineering Progress.
This study addresses the thermal management challenges associated with high-heat-flux chips by focusing on the flow and heat transfer characteristics, as well as structural optimization, of an elliptical ribbed manifold microchannel heat sink (MMCHS). In response to the insufficient understanding of how microchannel height, microchannel width, elliptical rib dimensions, and coolant volumetric flow rate affect pressure drop and heat dissipation performance, extensive numerical simulations were conducted. The study systematically investigated the effects of different channel geometries, rib configurations, and volumetric flow rates on the coupled flow and heat transfer behavior within the elliptical ribbed MMCHS. The results revealed the variation patterns of cooling performance, pressure drop, Nusselt number, friction factor, and thermal enhancement efficiency under different design parameters, and further clarified the underlying mechanisms governing these performance metrics and the associated thermal irreversibility. On this basis, a high-accuracy artificial neural network model was developed to predict the substrate bottom temperature and pressure drop. By integrating the artificial neural network with a genetic algorithm, multi-objective optimization was performed to obtain a Pareto front that simultaneously minimizes substrate bottom temperature and pressure drop. The results show that the optimized design can achieve a 1.36%–3.75% improvement in thermal enhancement efficiency within a lower Reynolds number range, providing valuable engineering guidance for chip thermal management under pumping-power-limited conditions.
Note: Thermal Science and Engineering Progress is a Q1 journal in the field of engineering and technology, with a 2025 impact factor of 5.4. The first author of the paper is doctoral student Shoujun Chen, and Professor Sunwei Li is the corresponding author. This work was supported by the Guangdong Basic and Applied Basic Research Foundation and the Tsinghua Shenzhen International Graduate School–Shenzhen Pengrui Young Faculty Program.