Detailed finite element method modeling of evaporating multi-component droplets
Detailed finite element method modeling of evaporating multi-component droplets
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DOI：
10.1016/j.jcp.2017.03.049
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发表时间：
2017-07-01
影响因子：
4.1
通讯作者：
Diddens, Christian
中科院分区：
文献类型：
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作者：
Diddens, Christian
采用轴对称有限元方法对静止多组分液滴的蒸发进行建模。该模型包含混合物蒸发、具有成分相关流体特性的多组分流动以及热效应的耦合过程。基于水 - 甘油和水 - 乙醇液滴的代表性实例，讨论了溶质马兰戈尼流的规则和混沌实例。此外，指出了基底厚度对挥发性二元混合物液滴蒸发冷却的相关性。展示了更易挥发组分的蒸发如何大幅降低界面温度，从而使较不易挥发组分的环境蒸汽在液滴上凝结。最后，将该模型的结果与润滑理论模型的相应结果进行比较，表明即使对于40度的中等接触角，润滑理论的应用也可能导致相当大的误差。（C）2017爱思唯尔公司。保留所有权利。
The evaporation of sessile multi-component droplets is modeled with an axisymmetic finite element method. The model comprises the coupled processes of mixture evaporation, multi-component flow with composition-dependent fluid properties and thermal effects. Based on representative examples of water-glycerol and water-ethanol droplets, regular and chaotic examples of solutal Marangoni flows are discussed. Furthermore, the relevance of the substrate thickness for the evaporative cooling of volatile binary mixture droplets is pointed out. It is shown how the evaporation of the more volatile component can drastically decrease the interface temperature, so that ambient vapor of the less volatile component condenses on the droplet. Finally, results of this model are compared with corresponding results of a lubrication theory model, showing that the application of lubrication theory can cause considerable errors even for moderate contact angles of 40 degrees. (C) 2017 Elsevier Inc. All rights reserved.