Topology optimization of heat sinks for instantaneous chip cooling using a transient pseudo-3D thermofluid model

TL;DR

This paper presents a topology optimization method for heat sinks using a transient pseudo-3D thermofluid model, achieving improved thermal performance and reduced pumping power for chip cooling.

Contribution

It introduces a computationally efficient pseudo-3D model combined with topology optimization to enhance heat sink design for instantaneous cooling.

Findings

66.7% reduction in pumping power compared to reference design

Improved instantaneous thermal performance of optimized heat sinks

Effective reduction of intermediate density regions during optimization

Abstract

With the increasing power density of electronics components, the heat dissipation capacity of heat sinks gradually becomes a bottleneck. Many structural optimization methods, including topology optimization, have been widely used for heat sinks. Due to its high design freedom, topology optimization is suggested for the design of heat sinks using a transient pseudo-3D thermofluid model to acquire better instantaneous thermal performance. The pseudo-3D model is designed to reduce the computational cost and maintain an acceptable accuracy. The model relies on an artificial heat convection coefficient to couple two layers and establish the approximate relationship with the corresponding 3D model. In the model, a constant pressure drop and heat generation rate are treated. The material distribution is optimized to reduce the average temperature of the base plate at the prescribed terminal time. Furthermore, to reduce the intermediate density regions during the density-based topology optimization procedure, a detailed analysis of interpolation functions is made and the penalty factors are chosen on this basis. Finally, considering the engineering application of the model, a practical model with more powerful cooling medium and higher inlet pressure is built. The optimized design shows a better instantaneous thermal performance and provides 66.7% of the pumping power reduction compared with reference design.