화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.91, 69-78, November, 2020
DOI10.1016/j.jiec.2020.07.017  Export Citation
Characterization of intermediate wetting states on micro-grooves by water droplet contact line
Cheung Tong Cheng, Suet To†, and Guoqing Zhang1
  • State Key Laboratory of Ultra-precision Machining Technology, Department of Industrial and Systems Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong SAR, PR China
  • 1College of Mechatronics and Control Engineering, Shenzhen University, Nanshan, Shenzhen 518060, Guangdong, PR China
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The wetting state of a water droplet remarkably affecting its sliding behavior is characterized by the droplet boundary contact line. This paper presents experimental studies of the apparent contact angle against droplet deposition time, as well as contact angle hysteresis, and compares the results with the Wenzel and Cassie?Baxter models. Observations indicate that different intermediate wetting phenomena exist. The sliding performance of a droplet under intermediate wetting states is also investigated. It is found that the droplet does not slide under partial wetting but slides when the side walls of the grooves have been wetted by part of the droplet. Further, that droplets under different wetting states on surfaces with varied groove spacing and widths, under the same groove spacing to width ratio, present altered sliding performance before rolling off from the micro-grooves in a parallel direction. This study broadens the characterization method of intermediate wetting states, which determines the condition of anisotropic sliding on micro-grooves. The findings have great potential for application to artificial self-cleaning surfaces.
Keywords:Characterization;Intermediate wetting state;Water droplet contact line;Anisotropic sliding;Micro-grooves
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