Hysteresis of Contact Angle at Liquid-solid Interface
Author(s): WANG Xiaodong, PENG Xiaofeng, MIN Jingchun, LIU Tao
Pages: 343-353
Year: 2001 Issue: 4
Journal: JOURNAL OF BASIC SCIENCE AND ENGINEERING
Keyword: contact angle; wettability; hysteresis; boiling and condensation phase-change; resistance of liquid wetting;
Abstract: A concept, resistance of liquid wetting solid surface, was introduced to investigate the contact anglecharacteristics of liquid touching solid surface in equilibrium. An expression and unified theory of liquid-solidcontact angle accounting for the resistance was theoretically obtained from mechanical and thermodynamic theoryrespectively, relating the wettability, advancing and receding contact angle with the roughness of the solidsurface. This new approach provides a thoughtful understanding of the physical nature of advancing and recedingcontact angle and the contact angle hysteresis phenomenon. Using this theoretical evidence, some phase-changetransport phenomena such as boiling nucleation, critical heat flux, minimum heat flux and droplet condensationwill be more intelligently described with a new discrimination. It is also possible to expose the effects of surfaceroughness on phase change heat transfer using a unique parameter, contact angle, other than the detail surfaceinformation.
Pages: 343-353
Year: 2001 Issue: 4
Journal: JOURNAL OF BASIC SCIENCE AND ENGINEERING
Keyword: contact angle; wettability; hysteresis; boiling and condensation phase-change; resistance of liquid wetting;
Abstract: A concept, resistance of liquid wetting solid surface, was introduced to investigate the contact anglecharacteristics of liquid touching solid surface in equilibrium. An expression and unified theory of liquid-solidcontact angle accounting for the resistance was theoretically obtained from mechanical and thermodynamic theoryrespectively, relating the wettability, advancing and receding contact angle with the roughness of the solidsurface. This new approach provides a thoughtful understanding of the physical nature of advancing and recedingcontact angle and the contact angle hysteresis phenomenon. Using this theoretical evidence, some phase-changetransport phenomena such as boiling nucleation, critical heat flux, minimum heat flux and droplet condensationwill be more intelligently described with a new discrimination. It is also possible to expose the effects of surfaceroughness on phase change heat transfer using a unique parameter, contact angle, other than the detail surfaceinformation.
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