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arXiv 2302.00641physics.flu-dyn
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多个蒸发液滴在柔性基底上相互作用的动力学

Dynamics of the interaction of multiple evaporating droplets on compliant substrates

Anna Malachtari, George Karapetsas

AI总结:

本文通过润滑理论和有限元模拟,研究了软粘弹性基底上两个挥发性液滴的蒸发相互作用,发现基底和气相耦合决定吸引或排斥,马兰戈尼应力抑制吸引并延长寿命,中等刚度基底出现对称性破缺。

摘要:

本文从理论上研究了一对薄挥发性液滴在软粘弹性固体基底上相互作用的动力学。所建立的模型充分考虑了蒸发冷却效应及由诱导热梯度产生的马兰戈尼应力,同时考虑了气相组成和液滴周围大气中蒸汽扩散的影响。利用润滑理论框架,我们推导了液滴轮廓和弹性固体位移的演化方程,并与气相中蒸汽浓度的拉普拉斯方程联合求解。采用分离压/前驱膜方法描述接触线运动。演化方程通过有限元方法进行数值求解,并进行了详尽的参数分析,以研究影响液滴相互作用动力学的物理特性和机制。结果表明,液滴通过软基底和气相两种途径相互作用。在无热毛细现象的情况下,由于两液滴之间蒸汽浓度增加导致的非均匀蒸发与弹性毛细现象的共同作用,决定了液滴间相互作用是吸引还是排斥。马兰戈尼应力在干燥过程早期抑制液滴吸引,并导致液滴寿命延长。对于中等刚度的基底,在蒸发后期发现了自发对称性破缺的出现。通过构建详细的动态相图,探索了这一复杂系统丰富的动力学行为。

英文摘要:

The dynamics of the interaction of a system of two thin volatile liquid droplets resting on a soft viscoelastic solid substrate are investigated theoretically. The developed model fully considers the effect of evaporative cooling and the generated Marangoni stresses due to the induced thermal gradients, while also accounting for the effect of the gas phase composition and the diffusion of vapour in the atmosphere of the droplets. Using the framework of lubrication theory, we derive evolution equations for both the droplet profile and the displacement of the elastic solid, which are solved in combination with Laplace's equation for the vapour concentration in the gas phase. A disjoining-pressure/precursor-film approach is used to describe contact-line motion. The evolution equations are solved numerically, using the finite-element method, and we present a thorough parametric analysis to investigate the physical properties and mechanisms that affect the dynamics of droplet interactions. The results show that the droplets interact through both the soft substrate and the gas phase. In the absence of thermocapillary phenomena, the combined effect of non-uniform evaporation due to the increased vapour concentration between the two droplets and elastocapillary phenonema determines whether the drop-drop interaction is attractive or repulsive. The Marangoni stresses suppress droplet attraction at the early stages of the drying process and lead to longer droplet lifetimes. For substrates with intermediate stiffness, the emergence of spontaneous symmetry breaking at late stages of evaporation is found. The rich dynamics of this complex system is explored by constructing a detailed map of the dynamic regimes.

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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