Heat Transfer Performance of Copper Powder-Copper Mesh Composite Wick Flat-Plate Micro Heat Pipe

Abstract Flat-plate micro heat pipe (FMHP) plays an important role in the field of heat dissipation of electronic devices through vapor–liquid two-phase flow. Improving the heat transfer performance of FMHP has become a hot topic. This article analyzes the heat transfer principle of the FMHP to discover that balancing the capillary pressure and permeability of the wick is crucial to the heat transfer performance of the FMHP. Therefore, we propose a kind of copper powder and three kinds of copper powder-copper mesh integrated sintered wicks, build an experimental device, and analyze and research their heat transfer performance. The results show that the wick sintered from two layers of copper mesh and copper powder can better balance the capillary pressure and permeability, and the prepared FMHP has the best heat transfer performance. The maximum thermal power is 30 W and the minimum thermal resistance is 0.27 °C/W at the optimum filling ratios.