Liquid-Infused Smooth Surface for Improved Condensation Heat Transfer
Liquid-Infused Smooth Surface for Improved Condensation Heat Transfer
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DOI：
10.1021/acs.langmuir.7b01991
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发表时间：
2017-09-12
期刊：
影响因子：
3.9
通讯作者：
Shiratori, Seimei
中科院分区：
文献类型：
--
作者：
Tsuchiya, Hirotaka;Tenjimbayashi, Mizuki;Shiratori, Seimei
控制蒸汽冷凝特性是一种很有前途的方法来管理能源基础设施条件的关键部分。由于在结构粗糙的超疏水表面上的水滴凝结可以获得良好的传热性能，超疏水涂层上的蒸汽冷凝传热引起了人们的关注。然而，在粗糙结构内固定的冷凝水滴和超疏水表面成核的高热力学能垒限制了它们的传热增加。近年来，由于液体注入表面具有较高的水滑动能力和表面光滑性，人们开始研究滑溜液体注入表面（SLIPS）。然而，即使在slip上，由于注入的液体流失，粗糙的底层暴露出来，因此在长时间使用后，冷凝的水滴最终也会被固定，从而降低其传热性能。在此，我们报告了一种注入液体的光滑表面，称为“SPLASH”（具有pi电子相互作用的表面，液体吸附，光滑和疏水性），以克服先前方法中粗糙结构带来的问题，从而获得稳定，高的传热性能。溅射的最大冷凝传热系数比未涂覆的基材高175%。从凝结水滴迁移率和成核热力学能垒的角度来看，与超疏水表面和slip相比，SPLASH具有更高的传热性能和更稳定的水滴凝结。研究了注入液体的表面粗糙度和液体粘度对冷凝传热的影响，比较了传热性能。这项研究将有助于蒸汽冷凝的工业应用。
Control of vapor condensation properties is a promising approach to manage a crucial part of energy infrastructure conditions. Heat transfer by vapor condensation on superhydrophobic coatings has garnered attention, because dropwise condensation on superhydrophobic surfaces with rough structures leads to favorable heat-transfer performance. However, pinned condensed water droplets-within the rough structure and a high thermodynamic energy barrier for nucleation of superhydrophobic surfaces limit their heat transfer increase. Recently, slippery liquid-infused surfaces (SLIPS) have been investigated, because of their high water sliding ability and surface smoothness originating from the liquid layer. However, even on SLIPS, condensed water droplets are eventually pinned to degrade their heat-transfer properties after extended use, because the rough base layer is exposed as infused liquid is lost. Herein, we report a liquid-infused smooth surface named "SPLASH" (surface with pi electron interaction liquid adsorption, smoothness, and hydrophobicity) to overcome the problems derived from the rough structures in previous approaches to obtain stable, high heat-transfer performance. The SPLASH displayed a maximum condensation heat-transfer coefficient that was 175% higher than that of an uncoated substrate. The SPLASH also showed higher heat-transfer performance and more stable dropwise condensation than superhydrophobic surfaces and SLIPS from the viewpoints of condensed water droplet mobility and the thermodynamic energy barrier for nucleation. The effects of liquid-infused surface roughness and liquid viscosity on condensation heat transfer were investigated to compare heat-transfer performance. This research will aid industrial applications using vapor condensation.