A Study on Capillary Flow under the Effect of Dynamic Wetting
A Study on Capillary Flow under the Effect of Dynamic Wetting
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DOI：
10.11395/jjsem.10.s62
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发表时间：
2010-08
期刊：
影响因子：
--
通讯作者：
K. Katoh;T. Wakimoto;S. Nitta
中科院分区：
文献类型：
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作者：
K. Katoh;T. Wakimoto;S. Nitta
提出了一个从宏观角度考虑动态接触角的理论模型。为了避免三相接触线附近粘性应力在壁面上的发散，假设液面为微凸形。动态接触角的理论结果取决于参数ε，即固体表面上缺陷所占的表面积的比率。对毛细管中液柱的运动进行了实验研究。修正后的Lucas-Washburn方程考虑了动态润湿的影响，能较好地反映实测结果。理论模型可以在实验不确定度范围内近似测量的动态接触角。
A theoretical model was proposed to consider the dynamic contact angle from a macroscopic viewpoint. A slight convex profile of liquid surface is assumed to avoid the divergence of viscous stress near the three-phase contact line on the wall. The theoretical results of the dynamic contact angle are dependent on the parameter ε, ie, the ratio of surface area occupied by the defects on the solid surface. The movement of liquid column in a capillary is investigated experimentally. The modified Lucas-Washburn equation including the effect of dynamic wetting represents well the measured results. The theoretical model can approximate the measured dynamic contact angles within the experimental uncertainty.