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Micromembrane-enhanced capillary evaporation

机译:微膜增强毛细管蒸发

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摘要

Micromembrane-enhanced evaporating surfaces were developed to enhance capillary evaporation heat transfer coefficient (HTC) and critical heat flux (CHF). Micromembranes made of sintered single-layer copper mesh screen were diffusion bonded on microchannels to effectively promote capillary pressure and reduce flow resistance. Compared with mono-porous evaporating surfaces such as microchannels and copper woven mesh laminates in the same thickness under the similar working conditions, CHF was substantially increased by 83% and 198%, respectively, because of the separation of the capillary pressure generation and fluid transport process that was enabled by the micromembrane. The major features such as "M"-shaped capillary evaporation heat transfer curves and the associated heat transfer regions were identified. Oscillating flows induced by the bubble growth and collapse as well as the capillary flows induced by the receding menisci were observed and believed to play imperative roles in enhancing the heat transfer by inducing advections and improving evaporation and nucleate boiling.
机译:开发了微膜增强的蒸发表面,以增强毛细管蒸发的传热系数(HTC)和临界热通量(CHF)。由烧结的单层铜网筛制成的微膜在微通道上扩散结合,以有效地促进毛细压力并降低流动阻力。与在相同工作条件下相同厚度的单通道蒸发表面(如微通道和铜编织网层压板)相比,由于毛细管压力产生和流体传输的分离,CHF分别大幅增加了83%和198%。微膜启用的过程。确定了主要特征,例如“ M”形毛细管蒸发传热曲线和相关的传热区域。观察到由气泡生长和破裂引起的振荡流,以及由后半月形引起的毛细管流,并被认为在通过引起对流,改善蒸发和成核沸腾来增强传热中起着必不可少的作用。

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