摘要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.
Abstract：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.
WANG Le-Feng;RONG Wei-Bin;SUN Li-Ning;CHEN Li-Guo;SHAO Bing. Capillary Forces between Submillimeter Spheres and Flat Surfaces at Constant Liquid Volumes[J]. 中国物理快报, 2009, 26(12): 126801-126801.
WANG Le-Feng, RONG Wei-Bin, SUN Li-Ning, CHEN Li-Guo, SHAO Bing. Capillary Forces between Submillimeter Spheres and Flat Surfaces at Constant Liquid Volumes. Chin. Phys. Lett., 2009, 26(12): 126801-126801.
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