倾斜均质表面上非等径液滴的聚合特性

COALESCENCE BEHAVIORS OF TWO DROPS WITH DIFFERENT SIZE ON A INCLINED HOMOGENOUS SURFACE

对倾斜均匀表面上非等径液滴的聚合过程及特性进行了可视化实验研究,获得了液滴半径和表面倾角等参数对液滴聚合过程中液滴液桥半径、接触角和接触线变化特性的影响规律,进一步说明了倾斜表面上液滴聚合可以加快液滴的运动。

Visualization experiments were conducted for studying coalescence behaviors of two drops with different size on an inclined homogenous surface. The variations of the contact line, the liquid bridge radius, and the contact angle of liquid drops with coalescence time were measured in coalescence of two liquid drops. Effects of drop size and wall inclination angle on liquid bridge radius, contact angle, and contact line were discussed, respectively. Experimental results show that the variations of the liquid bridge radius and the contact angle of coalescing liquid drops with coalescence time behave as a damped oscillation, generally. The shrinkage of contact line increases with the increase of wall inclination angle while the detachment size of coalesced drop and the oscillation frequency and amplitude of the liquid bridge radius decrease. As the size of liquid drops increases, the oscillation amplitude of liquid bridge radius increases and the oscillation frequency decreases. A larger wall inclination angle leads to a larger oscillation amplitude of contact angle of coalesced liquid drop after coalescing.