Enhancing Recurrent Droplet Jumping Phenomena on Heterogeneous Surface Designs
Enhancing Recurrent Droplet Jumping Phenomena on Heterogeneous Surface Designs
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DOI：
10.1002/admi.202200573
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发表时间：
2022-07
影响因子：
5.4
通讯作者：
Jonggyu Lee;Y. Won
中科院分区：
文献类型：
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作者：
Jonggyu Lee;Y. Won
超疏水表面上的聚结诱导液滴跳跃现象可以通过有效地去除表面上的液滴来显着提高其传热性能。然而，理解冷凝表面的理想设计仍然是具有挑战性的，由于与其成核，聚结和跳跃机制相关的液滴动力学的复杂性质。液滴行为的内在动力学性质表明，使用分层凹形态来解释与每种运输现象相关的不同长度尺度。因此，分层形态通过在超疏水表面上实现微米级液滴和通过在液滴跳跃后捕获液体残留物在液滴下方实现纳米级钉扎区域来实现异质润湿特性。通过提取物理上有意义的描述符，如成核位点，液滴生长速率和液滴跳跃频率，进一步研究传热性能，当液滴成核位点被设计在选择性位置时，显示出44%的增强。
Coalescence‐induced droplet jumping phenomena on superhydrophobic surfaces can significantly enhance their heat transfer performances by effectively removing droplets from the surfaces. However, understanding the ideal design for condensing surfaces is still challenging due to the complex nature of droplet dynamics associated with their nucleation, coalescing, and jumping mechanisms. The intrinsic dynamic nature of droplet behaviors suggests the use of hierarchical concave morphology to account for the different length scales associated with each transport phenomenon. The hierarchical morphology thereby enables heterogeneous wetting characteristics by realizing both microscale droplets on superhydrophobic surfaces and nanoscale pinning regions beneath the droplets by arresting liquid residues after droplet jumping. Heat transfer performances are further examined by extracting physically meaningful descriptors, such as nucleation sites, droplet growth rates, and droplet jumping frequency, showing 44% enhancements when droplet nucleation sites are designed in selective locations.