Macroscopic Wetting Behavior and a Method for Measuring Contact Angles

Author:

Katoh K.1,Fujita H.1,Sasaki H.2

Affiliation:

1. Department of Mechanical Engineering, Nagoya University, Nagoya 464, Japan

2. Toshiba Corp., Fuchu 183, Japan

Abstract

Macroscopic wetting behavior is investigated theoretically from a thermodynamic viewpoint. The axisymmetric liquid meniscus formed under a conical solid surface is chosen as the subject of the theoretical analysis. Using the meniscus configuration obtained by the Laplace equation, the total free energy of the system is calculated. In the case of the half vertical angle of the cone φ = 90 deg (horizontal plate), the system shows thermodynamic instability when the meniscus attaches to the solid surface at the contact angle. This result, unlike the conventional view, agrees well with the practical wetting behavior observed in this study. On the other hand, when 0 deg < φ < 90 deg, the system shows thermodynamic stability at the contact angle. However, when the solid cone is held at a position higher than the critical height from a stationary liquid surface, the system becomes unstable. It is possible to measure the contact angle easily using this unstable phenomenon.

Publisher

ASME International

Subject

Mechanical Engineering

Cited by 5 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Wetting on a plate with three-dimensional random roughness and heterogeneity;Heat Transfer?Asian Research;2001

2. Macroscopic Wetting Behavior of a Two-Dimensional Meniscus Under a Horizontal Plate;Journal of Fluids Engineering;1995-06-01

3. Quasiequilibrium meniscus formation with hysteresis effects;Physics of Fluids A: Fluid Dynamics;1993-11

4. The Measurement of Solid-Liquid Contact Angles;Journal of Fluids Engineering;1992-09-01

5. Motion of a Particle Floating on a Liquid Meniscus Surface;Journal of Fluids Engineering;1992-09-01

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