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arXiv 2005.14138physics.flu-dyn
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蒸发二元液滴中的竞争Marangoni对流和Rayleigh对流

Competing Marangoni and Rayleigh convection in evaporating binary droplets

Christian Diddens, Yaxing Li, Detlef Lohse

摘要:

对于一个小的固着或悬垂液滴,一般认为,一旦邦德数很小,重力就不起任何作用。这甚至被假设用于蒸发二元固着或悬垂液滴,其中对流流动可以由于一种组分的选择性蒸发和所产生的浓度以及因此在空气-液体界面处的表面张力差异而被驱动。然而,最近的研究表明,在这种液滴中,重力确实可以发挥作用,并且自然对流可以是蒸发二元液滴内部流动的主要驱动机制(Edwards等人,物理修订信函121,184501(2018); Li等人,物理修订信函122,114501(2019))。在这项研究中,我们推导并验证了一个准稳态模型内蒸发的二元固着和悬垂液滴,这成功地允许预测的流行和有趣的相互作用的瑞利和/或Marangoni对流的基础上的流场表示的瑞利和Marangoni数的相图。

英文摘要:

For a small sessile or pendant droplet it is generally assumed that gravity does not play any role once the Bond number is small. This is even assumed for evaporating binary sessile or pendant droplets, in which convective flows can be driven due to selective evaporation of one component and the resulting concentration and thus surface tension differences at the air-liquid interface. However, recent studies have shown that in such droplets gravity indeed can play a role and that natural convection can be the dominant driving mechanism for the flow inside evaporating binary droplets (Edwards et al., Phys. Rev. Lett. 121, 184501 (2018); Li et al., Phys. Rev. Lett. 122, 114501 (2019)). In this study, we derive and validate a quasi-stationary model for the flow inside evaporating binary sessile and pendant droplets, which successfully allows to predict the prevalence and the intriguing interaction of Rayleigh and/or Marangoni convection on the basis of a phase diagram for the flow field expressed in terms of the Rayleigh and Marangoni numbers.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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