振动诱导微结构粗糙表面水滴Wenzel-Cassie状态转变特性

doi:10.3969/j.issn.0438-1157.2014.02.025

化工学报 ›› 2014, Vol. 65 ›› Issue (2): 544-549.DOI: 10.3969/j.issn.0438-1157.2014.02.025

振动诱导微结构粗糙表面水滴Wenzel-Cassie状态转变特性

贾志海, 雷威, 贺吉昌, 蔡泰民

上海理工大学能源与动力工程学院, 上海 200093

收稿日期:2013-04-09 修回日期:2013-09-29 出版日期:2014-02-05 发布日期:2014-02-05
通讯作者: 贾志海（1975- ），男，博士，副教授。
基金资助:
国家自然科学基金项目（51176123）；上海市自然科学基金项目（11ZR1424800）；高等学校博士学科点专项科研基金项目（20103120120006）。

Vibration-induced Wenzel-Cassie wetting transition on rough patterned surface

JIA Zhihai, LEI Wei, HE Jichang, CAI Taimin

School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China

Received:2013-04-09 Revised:2013-09-29 Online:2014-02-05 Published:2014-02-05
Supported by:
supported by the National Natural Science Foundation of China (51176123), the Natural Science Foundation of Shanghai (11ZR1424800) and the Specialized Research Fund for the Doctoral Program of Higher Education of China (20103120120006).

摘要/Abstract

摘要： 以聚二甲基硅氧烷（PDMS）基底采用光刻蚀技术制备了微方柱结构粗糙表面。采用高速摄影对液滴在垂直振动作用下的动态浸润状态进行了图像采集。通过对水滴振动过程中的动态浸润特性分析，研究了粗糙表面水滴的Wenzel-Cassie浸润状态转变特征。结果表明，对于一定尺寸的Wenzel状态水滴，只有当施加的振动能量超过某一阈值时，微方柱粗糙表面Wenzel状态液滴才可以发生向Cassie状态的完全转变，且存在发生Wenzel-Cassie浸润转变的阈值范围；此外，当外加振动频率和液滴固有频率一致时，即在共振频率时，液滴发生Wenzel-Cassie状态转变需要的能量最小。外加振动频率偏离液滴固有频率越远，发生Wenzel-Cassie状态转变需要的能量最大。基于表面化学和振动力学理论，建立了液滴发生Wenzel-Cassie转变时的物理模型。

关键词: 表面, 振动, 水滴, 浸润转变, 实验验证, 模型

Abstract: Superhydrophobic surfaces have aroused great attention for promising applications, e.g., enhanced heat transfer. The rough surface of square-shaped pillars was prepared from the polydimethyl-siloxane (PDMS) substrate by using photolithography technique. Based on the analysis of dynamic wetting characteristics of water droplets during vertical vibration, the Wenzel-Cassie wetting transition on the rough surface was studied with experimental and theoretical techniques. The experimental results showed that the Wenzel state droplets on the square-shaped pillars rough surface could change to the Cassie state when forced vibration frequency and amplitude were in the threshold range. When the eigenfrequency of the droplet was in accordance with forced vibration frequency, that is to say, at the resonance frequency, the forced vibration amplitude for Wenzel-Cassie wetting transition reached the lowest value. When forced vibration frequency was far from eigenfrequency, vibration amplitude was greater than the amplitude corresponding to resonance frequency. In the end, using the theory of surface chemistry, combining with vibration mechanics, a physical model was proposed to explain the Wenzel-Cassie wetting transition mechanism. This study could be potentially used to improve and control the heat transfer performance of dropwise condensation.

Key words: surface, vibration, water droplet, wetting transition, experimental validation, model

中图分类号:

TQ051.5

贾志海, 雷威, 贺吉昌, 蔡泰民. 振动诱导微结构粗糙表面水滴Wenzel-Cassie状态转变特性[J]. 化工学报, 2014, 65(2): 544-549.

JIA Zhihai, LEI Wei, HE Jichang, CAI Taimin. Vibration-induced Wenzel-Cassie wetting transition on rough patterned surface[J]. CIESC Journal, 2014, 65(2): 544-549.

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振动诱导微结构粗糙表面水滴Wenzel-Cassie状态转变特性

Vibration-induced Wenzel-Cassie wetting transition on rough patterned surface

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