Capillary Forces between Submillimeter Spheres and Flat Surfaces at Constant Liquid Volumes
Capillary Forces between Submillimeter Spheres and Flat Surfaces at Constant Liquid Volumes
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DOI：
10.1088/0256-307x/26/12/126801
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发表时间：
2009-11
影响因子：
3.5
通讯作者：
W. Le-feng;Rong Weibin;S. Li-ning;C. Liguo;Shao Bing
中科院分区：
文献类型：
--
作者：
W. Le-feng;Rong Weibin;S. Li-ning;C. Liguo;Shao Bing
本文从理论和实验两方面研究了恒液体体积下亚毫米球与平面之间的毛细力。以接触角为边界条件，以恒体积为约束条件，采用迭代法估算毛细力。理论分析表明，在小接触角下，两者之间的最大毛细作用力随液桥体积的增大而减小。实验结果表明，在初始分离距离处，力小于理论值。还观察到，在某些情况下，力首先增加，然后随着分离距离的增加而减小。根据润湿滞后现象解释了毛细力滞后现象。
We investigate the capillary forces between submillimeter spheres and flat surfaces at constant liquid volumes theoretically and experimentally. An iterative method is used to estimate the capillary force with contact angles as the boundary conditions and the constant volume as a constraint. The theoretical analysis shows that the maximum capillary force between them decreases with the increase of the liquid bridge volume at small contact angles. The experimental results show that the force is smaller than the theoretical values at the initial separation distances. It is also observed that the force first increases and then decreases with an increasing separation distance in some cases. These phenomena of capillary forces hysteresis are explained according to the wetting hysteresis.