论文标题
在蒸发二进制液滴方面竞争Marangoni和Rayleigh对流
Competing Marangoni and Rayleigh convection in evaporating binary droplets
论文作者
论文摘要
对于小梗或吊坠液滴，通常假定一旦键键很小，重力就不会起任何作用。甚至假定这是用于蒸发二进制梗或吊坠液滴，在这种液滴下，由于一种成分的选择性蒸发以及所得的浓度，可以驱动对流流量，从而在空气液体界面处呈浓度，从而表面张力差异。然而，最近的研究表明，在这样的液滴中，重力确实可以起作用，并且自然对流可以成为蒸发二进制液滴内部流动的主要驾驶机制（Edwards等，Phys。Phys。Rev。Lett。121，184501（2018）; Li等人，Li等，Phys。Phys。Rev。Lett。122，114501（2019）。在这项研究中，我们得出了一个准平台模型，用于蒸发二进制衬里和吊坠液滴内部的流动模型，该模型成功地允许根据雷利（Rayleigh）和马兰吉尼（Marangoni）数量表达的流场基础上的相位图基础上预测雷利（Rayleigh）和/或Marangoni对流的流行率和吸引人的相互作用。
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.
