孙小涵,党超,王小伟.异形微结构表面润湿特性数值研究[J].表面技术,2023,52(12):160-168, 187.
SUN Xiao-han,DANG Chao,WANG Xiao-wei.Numerical Study on Wetting Characteristics of Special-shaped Microstructure Surface[J].Surface Technology,2023,52(12):160-168, 187 |
| 异形微结构表面润湿特性数值研究 |
| Numerical Study on Wetting Characteristics of Special-shaped Microstructure Surface |
| 投稿时间：2023-10-01 修订日期：2023-11-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2023.12.014 |
| 中文关键词: 异形微结构 本征接触角 润湿状态 低表面能工质 几何参数 |
| 英文关键词:special-shaped microstructure intrinsic contact angle wetting state low surface energy working medium geometric parameters |
| 基金项目:国家自然科学基金(52106069);装备预研教育部联合基金(8091B032247) |
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| Author | Institution |
| SUN Xiao-han | Institute of Thermal Engineering, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China;Beijing Key Laboratory of Flow and Heat Transfer of Phase Changing in Micro and Small Scale, Beijing 100044, China |
| DANG Chao | Institute of Thermal Engineering, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China;Beijing Key Laboratory of Flow and Heat Transfer of Phase Changing in Micro and Small Scale, Beijing 100044, China |
| WANG Xiao-wei | National Energy Group Science and Technology Research Institute Co., Ltd., Nanjing 210023, China |
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| 中文摘要: |
| 目的 通过表面异形微结构设计实现低表面能有机工质的润湿性调控。方法 运用VOF模型针对不同表面能工质液滴在多种异形微结构表面的润湿情况进行仿真研究，着重分析了微结构构型、微结构间距、宽度等几何参数尺寸对液滴润湿行为的影响，提出了微结构表面实现润湿状态转变的临界判别准则。结果 研究发现单层双折返微结构疏液性能远优于单层单折返和单层柱形微结构表面，可以在不依赖表面化学的情况下，实现本征接触角为5°的低表面能工质的超疏水状态。单层柱形微结构在间距100~250 μm时，临界本征接触角大于90°。单层单折返微结构在间距100~250 μm时，临界本征接触角大于19°。双层异形微结构疏液性明显低于单层异形微结构。结论 相较于单层柱形微结构和单层单折返微结构，单层双折返微结构可以实现对低表面能工质的排斥，液滴在异形微结构间距较大、宽度较小的条件下，也能保持良好的超疏水性。双层异形微结构由于结构尺寸较小，毛细力作用显著，表面疏液性能仅与上层微结构有关，下层结构的能量壁垒失效。除此之外，基于研究内容，利用异形微结构润湿性差异，提出了可实现低表面能液滴定向运输的异形微结构表面。 |
| 英文摘要: |
| Superlyophobic surfaces are playing an increasingly important role in practical applications due to their excellent performance such as self-cleaning, anti-icing and droplet manipulation. In practical application, low surface energy working medium is the most widely used working medium except water, but the properties of low surface energy working medium are obviously different from water, so how to realize the control of wettability of low surface energy organic working medium has become the main concern of the industry. To investigate the mechanism of wettability regulation of low surface energy working fluid by special-shaped microstructures, simulation studies were conducted on a variety of special-shaped microstructure surfaces. VOF model was used in this work to simulate the wettability of different surface energy working media on special-shaped microstructure surface. Contact angle was an important index to measure wettability. This work focused on analyzing the effect of microstructure, spacing and upper microstructure surface width on the wetting behavior. It was found that the lyophobic performance of single-layer double reentrant microstructure was much better than that of single-layer single reentrant and cylindrical microstructures, and the superlyophobic state of low surface energy working medium with intrinsic contact angle of 5° could be achieved without relying on surface chemistry. When the spacing of the cylindrical microstructure was between 100 μm and 250 μm, the critical intrinsic contact angle was more than 90°. When the single-layer single reentrant microstructure was between 100 μm and 250 μm, the critical intrinsic contact angle was more than 19°. The lyophobicity of single-layer double reentrant microstructures to low surface energy working fluids was less affected by the spacing and width of special-shaped microstructures. The study of droplet wetting behavior showed that the smaller the solid-liquid interface contact area, the larger the apparent contact angle, and the better the lyophobic performance. At the same time, the energy barrier of the reentrant structure had a great effect on the improvement of lyophobicity. Therefore, the double-layer special-shaped microstructure with a small width of the first layer was designed to reduce the contact area and increase the energy barrier. Due to the small size of the double-layer special-shaped microstructure and the significant effect of capillary force, the surface lyophobic performance was only related to the upper microstructure, and the energy barrier of the lower structure failed. In addition, based on the research content and the wettability difference of special-shaped microstructure, a special-shaped microstructure surface which could realize directional transport of droplets was proposed. The results show that the self-drive of low surface energy droplets can be effectively realized through the surface microstructure design. Simple operation and low energy consumption are of great significance for practical applications. |
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