Model Description on the Interface Deformation after the Release of the Pinned Contact Line
Model Description on the Interface Deformation after the Release of the Pinned Contact Line
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DOI：
10.3811/jjmf.2020.024
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发表时间：
2020-03
期刊：
影响因子：
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通讯作者：
T. Ito;Souichiro Fujii;T. Tsuneyoshi;Y. Tsuji;K. Katoh;T. Wakimoto
中科院分区：
文献类型：
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作者：
T. Ito;Souichiro Fujii;T. Tsuneyoshi;Y. Tsuji;K. Katoh;T. Wakimoto
接触线很容易卡在缺陷或不同润湿性区域的边界上。接触线一直被困住，直到接触角增加到超过前进角或减少到低于后退角。一旦满足这个条件，接触线就会从捕获点释放出来，并随着接触角向平衡接触角的变化而迅速前进或后退。本文对槽边脱离粘滞状态后的接触线运动和接触角进行了理论描述。在Stokes近似下，法向应力平衡和邻近表面的相应流场得到了表达。由于界面变形被限制在距离固体表面一定距离内，称为“边界层”，因此采用接触线和边界层外边界处的边界条件来求解法向应力平衡方程上的方程。将数值计算结果与实验数据进行了比较，两者吻合较好。
Contact line can be easily stuck (pinned) on the defects or boundary of the different wettability regions. The contact line remains to be trapped until the contact angle increases beyond the advancing angle or decreases below the receding angle. Once such condition is satisfied, the contact line is released from the trapping site and rapidly proceeds or recedes with the contact angle changing toward the equilibrium contact angle. In this study theoretical description on the contact line motion and the contact angle after the release from the stuck condition at the groove edge is developed. The normal stress balance and the corresponding flow field adjacent to the surface are expressed under Stokes approximation. Since the interface deformation was limited within a certain distance from the solid surface, referred as ‘boundary layer’, the equation on the normal stress balance equation was solved with the boundary condition at the contact line and the outer boundary of the boundary layer. The results numerically obtained were compared with the experimental data, showing fairly good agreement between them.