液滴碰撞倾斜壁面的动力学特性

Experimental study of the dynamic characteristics of an oblique impact of a water droplet

为了探究液滴碰撞在固体表面的动力学特性,该文进行了不同初速度的液滴以不同角度撞击光滑不锈钢表面的实验,通过实验研究了液滴的碰撞角度和Weber数对碰撞过程中液滴的动力学特性,如液滴前后沿点位移、最大铺展直径、滑移距离等的影响。结果表明:液滴的最大无量纲铺展直径随Weber数的增大而增大,随斜面倾斜角度的增大而减小;但是,液滴最终静止在表面时与表面的接触直径几乎不受Weber数和碰撞角度的影响,而是取决于液滴在表面上的前进接触角和后退接触角;另外,液滴的前后沿点位移和滑移距离随碰撞角度和Weber数的增大都呈现上升趋势。

The impact of water droplets on a smooth stainless-steel surface was studied experimentally for various velocities and angles.The experiments studied the effects of impact angle and Weber number on the dynamic characteristics of the impact process,such as the displacement of leading and trailing edges,the maximum spread diameter and gliding length.The results showed that the maximum spread diameter increased with increasing Weber number,but decreased with increasing surface slope.However,once the water droplet reached equilibrium,the droplet contact diameter was found to be independent of the impact angle and the Weber number but mainly depended on the advancing and receding contact angles of the droplet on the surface.In addition,increasing both the impact angle and the Weber number increased the gliding length.