Recent experimental results indicate that mixing is enhanced by a reciprocal flow induced inside a levitated droplet with an oscillatory deformation [T. Watanabe et al., Sci. Rep. 8, 10221 (2018)]. Generally, reciprocal flow cannot convect the solutes in time average, and agitation cannot take place. In the present paper, we focus on the diffusion process coupled with the reciprocal flow. We theoretically derive that the diffusion process can be enhanced by the reciprocal flow, and the results are confirmed via numerical calculation of the over-damped Langevin equation with a reciprocal flow.

中文翻译：

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通过振荡变形增强悬浮液滴的扩散

最近的实验结果表明，在悬浮液滴内部产生的往复流动会增强混合作用，从而产生振荡变形[T。渡边等。，科学。代表。 8，10221（2018）]。通常，往复流动不能在时间平均上使溶质对流，并且不能进行搅拌。在本文中，我们专注于扩散过程与往复流动。从理论上讲，我们可以通过往复流动来增强扩散过程，并通过对带有往复流动的过阻尼兰格文方程进行数值计算来验证结果。