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arXiv 1702.01664physics.flu-dyncond-mat.softphysics.comp-ph
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浸没液滴在基底上的聚结

Coalescence of immersed droplets on a substrate

Dennis Hessling, Jacco H. Snoeijer, Jens Harting

摘要:

基板上的液滴的动力学对微流体系统具有强烈的影响,从市售的芯片实验室系统到开放式微流体的最新发展。微液滴和纳米液滴在基底上的聚结已经被广泛研究,但在以前的研究中,重点一直是界面运动。在这里,我们使用计算机模拟研究聚结液滴浸没在另一种液体中,在惯性占主导地位的制度,也调查液滴的内部流场。结果表明,该动力学性质类似于空气中的聚结,具有相同的自相似增长规律。我们在这里指出,在90度的液滴的缩放参数的模糊性,这表明自己的速度。我们发现,液滴的接触角低于90度表现出自相似的速度场,并确定了相应的标度律。然而,对于90度的下降,它表明,速度场有一个更复杂的结构,超出了通常的缩放参数调用聚结。

英文摘要:

The dynamics of droplets on substrates has a strong impact on microfluidic systems ranging from commercially available lab-on-chip systems to state of the art developments in open microfluidics. Coalescence of micro and nano droplets on a substrate has been studied extensively, but in previous studies the focus has been on the interface movement. Here, we use computer simulations to investigate coalescence of droplets immersed in another liquid, in an inertia-dominated regime and also investigate the droplet's internal flow field. It is found that qualitatively the dynamics is similar to coalescence in air, with the same self-similar growth laws. We here point out the ambiguity in the scaling argument for droplets of 90 degrees, that shows itself in the velocities. We show that droplets with a contact angle below 90 degrees exhibit a self-similar velocity field, and the corresponding scaling laws are identified. For drops of 90 degrees, however, it is shown that the velocity field has a more intricate structure that is beyond the usual scaling arguments invoked for coalescence.

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