Abstract:

With the advantages of high thermal conductivity, excellent temperature uniformity, compact structure, and high reliability, the ultrathin vapor chamber (UTVC) has become an effective way to deal with high heat flux heat dissipation in restricted space. However, the narrow liquid reflux channel and vapor flow channel of the UTVCs weaken the heat transfer capability of the UTVCs. To improve the heat transfer performance of UTVCs, researchers have conducted a number of studies, mainly including the wick structure optimization design, the surface modification of the internal structure, and the development of novel working fluids. In this paper, the research status and development tendency of the above three ways to improve the heat transfer performance of UTVCs were summarized comprehensively and systematically, and the solutions to the shortcomings of current studies were prospected. The development of novel wick structures with both high capillary pressure and low flow resistance will continue to be a focus of future research. Moreover, in terms of the surface treatment, studies of the hydrophobic treatment of condensing surfaces of UTVC can be further conducted. In addition, the development of new working fluids suitable for UTVC is also required.

Key words: ultrathin vapor chamber, enhanced heat transfer, wick structure optimization, surface treatment, novel working fluid

摘要：

超薄均热板具有热导率高、均温性优良、结构紧凑和可靠性高等优点，已成为应对受限空间高热流密度散热的有效手段。然而，超薄均热板内部狭窄的液体回流通道和蒸汽流动通道，削弱了超薄均热板的传热能力。为了改善超薄均热板的传热性能，研究人员进行了大量研究，主要包括吸液芯的结构优化设计、内部结构的表面处理和新型工质的研发。本文对上述三种改善超薄均热板传热性能途径的研究现状和发展动态进行了全面系统的总结，并针对当前研究存在的不足提供了解决方案，指出研发同时具有高毛细力和低流动阻力的新型吸液芯结构依然是今后的研究重点，而对于表面处理，可进一步扩展对超薄均热板冷凝表面疏水处理的研究，此外需研发适用于超薄均热板的新型工质。

关键词: 超薄均热板, 强化传热, 吸液芯结构优化, 表面处理, 新型工质