Sensitivity Analysis and Optimization of Heat Transfer Performance of Ultra-thin Vapor Chamber with Composite Wick

An ultra-thin vapor chamber (VC) with the composite wick formed by four spiral woven meshes (SWMs) and a copper mesh was proposed to solve the heat dissipation problem in miniaturized electronic equipment because of its sufficient heat transfer capability under limited thickness. However, the influence factors on the thermal performance of the VC with composite wick are more than that of the VC with a single type of wick. In this study, a theoretical model for calculating the maximum heat transfer capacity of VC with composite wick and a three-dimensional numerical model for the heat transfer characteristics of VC are established, and the simulation results are in good agreement with the experimental results. The orthogonal test method was used to determine that both the width of the vapor channel (wv) and the thickness of the vapor channel (tv) have a significant effect on the maximum heat transfer capacity and thermal resistance, while the porosity of the mesh (εmesh) has a prominent effect on the maximum heat transfer capacity, but has little effect on the thermal resistance. Further optimization of the sensitive factors for VC heat transfer performance was achieved to improve the maximum heat transfer capacity of the ultra-thin VC.