Microchannel-elevated micromembrane for sustainable phase-separation condensation
Microchannel-elevated micromembrane for sustainable phase-separation condensation
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DOI：
10.1016/j.joule.2022.11.010
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发表时间：
2022-12
期刊：
影响因子：
39.8
通讯作者：
Li Shan;Zongqi Guo;D. Monga;Dylan Boylan;X. Dai
中科院分区：
文献类型：
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作者：
Li Shan;Zongqi Guo;D. Monga;Dylan Boylan;X. Dai
可持续的高传热系数对于利用蒸汽冷凝的水和能源系统至关重要。目前的技术无法在高热通量下实现高传热性能。需要将蒸汽和液体流分开以提供用于冷凝的大表面积。在这里，我们报告了微通道升高微膜（MEM）上的可持续相分离，方法是（1）使用疏水微膜分离蒸汽和液体，快速去除冷凝液滴以实现高传热系数；（2）持续去除微膜下方疏水微通道内的冷凝水以防止洪水。我们发现 MEM 可以在 1,000 kW/m2 的热通量下维持相分离，而不会出现明显故障。传热系数比疏水平面上滴状冷凝的传热系数高300%。 MEM 上的相分离为无论过冷程度如何的可持续高性能冷凝提供了范例。
A sustainable high heat transfer coefficient is critical for water and energy systems that utilize steam condensation. Current techniques cannot achieve a high heat transfer performance at a high heat flux. It is desired to separate vapor and liquid flow to provide a large surface area for condensation. Here, we report sustainable phase separation on microchannel-elevated micromembrane (MEM) by (1) separating the vapor and liquid using a hydrophobic micromembrane that rapidly removes condensed droplets to achieve a high heat transfer coefficient and (2) sustaining continual condensate removal inside the hydrophobic microchannels beneath the micromembrane to prevent flooding. We found that MEM could sustain phase separation at a heat flux of 1,000 kW/m2without apparent failure. The heat transfer coefficient is 300% higher than that of the dropwise condensation on a hydrophobic flat surface. The phase separation on MEM provides a paradigm for sustainable high-performance condensation regardless of subcooling.