Dynamics of spreading of liquid on solid surface

Abstract

Abstract: Based on assuming that there is the precursor film in the front of the apparent contact line (ACL), a model was proposed to understand the dynamic wetting process and associated dynamic contact angle. The present model indicated that a new dimensionless characteristic parameter, λ, affects the dynamic wetting process and associated dynamic contact angle as well. However, the previous model suggested that the dynamic contact angle is dependent on the capillary number and static contact angle only. An experimental investigation was conducted to measure the dynamic wetting behavior of silicon oil moving over glass, aluminum and stainless steel surfaces. It concluded that when the value of λ was selected as 0.07, 0.16 and 0.35 for glass, aluminum and stainless steel, respectively, the experimental results were in good accordance with the prediction of the model. Furthermore, the comparison of the model with Ström’s experimental data showed that λ is independent on the species of liquids. Apparently, λ should be interpreted as the effect of the solid surface properties on the dynamic wetting process. Meanwhile, it is found in the present experiment that the Hoffman-Voinov-Tanner law, which is valid at very low capillary number (Ca 1 or θD＜10°) recommend by Cazabat, still holds for higher contact angles, even up to 70°—80°. This is explained by the present model very well.

Key words: dynamic wetting, dynamic contact angle, stress singularity, precursor film, slip

摘要： Based on assuming that there is the precursor film in the front of the apparent contact line (ACL), a model was proposed to understand the dynamic wetting process and associated dynamic contact angle. The present model indicated that a new dimensionless characteristic parameter, λ, affects the dynamic wetting process and associated dynamic contact angle as well. However, the previous model suggested that the dynamic contact angle is dependent on the capillary number and static contact angle only. An experimental investigation was conducted to measure the dynamic wetting behavior of silicon oil moving over glass, aluminum and stainless steel surfaces. It concluded that when the value of λ was selected as 0.07, 0.16 and 0.35 for glass, aluminum and stainless steel, respectively, the experimental results were in good accordance with the prediction of the model. Furthermore, the comparison of the model with Ström’s experimental data showed that λ is independent on the species of liquids. Apparently, λ should be interpreted as the effect of the solid surface properties on the dynamic wetting process. Meanwhile, it is found in the present experiment that the Hoffman-Voinov-Tanner law, which is valid at very low capillary number (Ca 1 or θD＜10°) recommend by Cazabat, still holds for higher contact angles, even up to 70°—80°. This is explained by the present model very well.

关键词: dynamic wetting;dynamic contact angle;stress singularity;precursor film;slip

WANG Xiaodong, PENG Xiaofeng, DUAN Yuanyuan, WANG Buxuan. Dynamics of spreading of liquid on solid surface[J]. , DOI: .

王晓东, 彭晓峰, 段远源, 王补宣. 液体在固体表面上的铺展动力学[J]. , DOI: .

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