Stretching and compressing of liquid bridge between two particles could lead to contact angle hysteresis and then capillary force hysteresis,having some significant effects on interparticle force estimation.Most previous experimental and theoretical works focused on the process of contact line sliding on particle surface when the liquid bridge is stretched,due to the facts that a fixed value of contact angle,concave shape of liquid bridge profile,and a decrease of capillary force with respect to particle separation distance could probably occur,which simplifies the problem.The hysteresis of contact angle and capillary force,however,could not be involved.This work proposed six categories of concave and convex liquid bridge profiles according to simple conditions and deduced the closed-form expressions of liquid bridge geometry and capillary force.The comparison between model predictions and measurements in literature shows that the model is able to identify liquid bridge profiles quickly and predict the capillary force hysteresis reasonably well in a complete stretching-compression loop of liquid bridge.
关键词
接触角迟滞/毛细力迟滞/凸形液桥/凹形液桥/环形近似
Key words
contact angle hysteresis/capillary force hysteresis/convex/concave/toroidal approximation
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