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引论 在低重力条件下,表面张力将起主要作用。最近,由于两项重要应用而激发起了低重力条件下关于界面稳定性方面的Marangoni效应的新的研究兴趣。这两项应用即:低重力的航天实验室条件下金属融炼处理及材料纯度的测定。本文涉及的是竖直表面上挂滴的浮升-热毛细不稳定性及确定蒸发速度的方法。当一个液滴被置于一个竖直表面上时,重力使之变形而成为一个薄液层下挂一个“泪头”。本文使用激光阴影法对这一薄液膜及其“泪头”的界面稳定性作了可视化研究并确定了这两部分液体的体积变化历程。
Introduction Under low gravity conditions, surface tension will play a major role. More recently, there has been a new interest in Marangoni effects on interface stability at low gravity due to two important applications. These two applications are: Metal Melting Processing and Material Purity Determination in Low-Gravity Space Laboratory Conditions. This article deals with the drop-on-drop thermal capillary instability and the method of determining the rate of evaporation on a vertical surface. When a droplet is placed on a vertical surface, the force of gravity deforms it to a “tear-drop” beneath a thin layer of liquid. In this paper, the laser shadow method was used to visualize the interface stability of the thin liquid film and its “tear-head” and to determine the volume change history of these two liquids.