Enhanced wickability of bi-particle-size, sintered-particle wicks for high-heat flux two-phase cooling systems
Enhanced wickability of bi-particle-size, sintered-particle wicks for high-heat flux two-phase cooling systems
复制标题
DOI：
10.1016/j.ijheatmasstransfer.2021.121714
复制
发表时间：
2021-11
影响因子：
5.2
通讯作者：
Munonyedi Egbo;J. Keese;G. Hwang
中科院分区：
文献类型：
--
作者：
Munonyedi Egbo;J. Keese;G. Hwang
热管和蒸汽室等两相热管理系统在现代电子产品和航天器中提供了高热流密度冷却性能。然而，较差的渗透性，即渗透率与毛细管泵送能力的比值（K/reff），限制了冷却性能。在这项研究中，我们使用双颗粒尺寸的烧结颗粒芯来检查增强的芯性。双粒径芯是具有两种不同粒径（200/60、200/100、350/60、550/60 μm）和两种不同重量比（75:25和50:50 wt%）的烧结颗粒芯，以FC-72为工作流体，采用上升速率法表征其脆性。结果表明，单层200/100 μm （50:50 wt%）双颗粒芯比200 μm和60 μm均匀颗粒芯分别提高了27%和35%的wickabilityK/reff。这种增强是由于大颗粒的渗透性增加和小颗粒的有效毛细管半月板半径减小。这项工作为高热流密度两相冷却系统的先进芯设计提供了见解。
Two-phase thermal management systems such as heat pipes and vapor chambers offer high heat flux cooling performance in modern electronics and spacecrafts. However, the cooling performance is limited by poor wickability, i.e., ratio of permeability to capillary pumping capability,K/reff. In this study, we examine the enhanced wickability using bi-particle-size, sintered-particle wicks. The bi-particle-size wicks are sintered particle wicks having two different particle sizes (200/60, 200/100, 350/60, 550/60 μm) with two different particle weight ratios (75:25 and 50:50 wt%), and the wickability are characterized using a rate-of-rise method with FC-72 as a working fluid. It is found that the single-layer 200/100 μm (50:50 wt%) bi-particle-size wick enhances the wickabilityK/reffby 27% and 35%, compared to that of 200 and 60 μm uniform particle wick, respectively. This enhancement is due to the increased permeability from the large particle size and the reduced effective capillary meniscus radius from the small particles. This work provides an insight into advanced wick designs for high heat flux two-phase cooling systems.