液体在固体表面上的铺展动力学

CIESC Journal

• PROCESS AND PRODUCT TECHNOLOGY • 上一篇下一篇

液体在固体表面上的铺展动力学

王晓东¹; 彭晓峰²; 段远源²; 王补宣²

¹ Department of Thermal Engineering, School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China
² Department of Thermal Engineering, Tsinghua University, Beijing 100084, China

收稿日期:2006-10-16 修回日期:1900-01-01 出版日期:2007-10-28 发布日期:2007-10-28
通讯作者: 王晓东

Dynamics of spreading of liquid on solid surface

WANG Xiaodong¹; PENG Xiaofeng²; DUAN Yuanyuan²; WANG Buxuan²

¹ Department of Thermal Engineering, School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China
² Department of Thermal Engineering, Tsinghua University, Beijing 100084, China

Received:2006-10-16 Revised:1900-01-01 Online:2007-10-28 Published:2007-10-28
Contact: WANG Xiaodong

摘要/Abstract

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

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

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]. CIESC Journal.

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

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液体在固体表面上的铺展动力学

Dynamics of spreading of liquid on solid surface

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