Marangoni流驱动下的类Leidenfrost悬浮
Self-Propulsion of Liquid Marbles: Leidenfrost-Like Levitation Driven by the Marangoni Flow
摘要：
本文报道了放置在水面上的装有含水酒精溶液的液体弹子的自推进。大理石的速度特性约为0.1 m/s。自推进现象与Marangoni溶质毛细管流动有关，该流动是由从液体大理石蒸发的酒精在水面上凝结而引起的。马兰戈尼流反过来又增强了酒精从大理石中的蒸发。向支撑弹珠的水中加入酒精会抑制自推进。液体小球的推进主要是由水阻力阻止的。大理石的质心运动速度随酒精浓度的增加而增大。弹珠自推进的速度与其体积无关。
英文摘要：
Self-propulsion of liquid marbles filled with aqueous alcohol solutions and placed on a water surface is reported. The characteristic of velocity of the marbles is about 0.1 m/s. The phenomenon of self-propulsion is related to the Marangoni solutocapillary flow caused by the condensation of alcohol, evaporated from the liquid marble, on a water surface. The Marangoni flow in turn enhances the evaporation of alcohol from marbles. Addition of alcohol to the water supporting the marbles suppresses the self-propulsion. The propulsion of liquid marbles is mainly stopped by water drag. The velocity of the center of mass of marbles grows with the increase of the concentration of alcohol in a marble. The velocity of marbles self-propulsion is independent on their volume.
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