气泡
跌落冲击
机械
下降(电信)
气泡
材料科学
飞溅
夹带空气
毛细管作用
惯性
微电子
夹带(生物音乐学)
复合材料
纳米技术
机械工程
润湿
经典力学
物理
工程类
声学
节奏
作者
Wilco Bouwhuis,Roeland van der Veen,Tuan Tran,Diederik L. Keij,Koen G. Winkels,Ivo R. Peters,Devaraj van der Meer,Chao Sun,Jacobus Hendrikus Snoeijer,Detlef Lohse
摘要
At impact of a liquid drop on a solid surface, an air bubble can be entrapped. Here, we show that two
competing effects minimize the (relative) size of this entrained air bubble: for large drop impact velocity and large droplets, the inertia of the liquid flattens the entrained bubble, whereas for small impact velocity and small droplets, capillary forces minimize the entrained bubble. However, we demonstrate experimentally, theoretically, and numerically that in between there is an optimum, leading to maximal air bubble entrapment. For a 1.8 mm diameter ethanol droplet, this optimum is achieved at an impact velocity of 0:25 m=s. Our results have a strong bearing on various applications in printing technology, microelectronics, immersion lithography, diagnostics, or agriculture
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