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Influence region theory of the evaporating droplet

机译：蒸发液滴的影响区域理论

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The coupling mechanism between the evaporating droplet and surrounding gas is a challenging topic for heat and mass transfer of two phase flow. Generally, the mass, momentum and heat source terms are added to gas conservation equations to describe the action of the droplet on gas phase. However, usually, the source terms are only imposed to just the fluid mesh where the droplet is located, which can lead to the computation divergence. Therefore, this research tries to study the influence of the droplet on the fluid field to figure out the two-way coupling mechanism. The numerical simulation of the water droplet evaporation in hot air under is conducted based on VOF model, which reveals that only the specific fluid field region surrounding the droplet can be influenced by the droplet. The concept of influence region of the evaporating droplet is proposed based on theoretical analysis. Within influence region, parameters of the gas surrounding the droplet change dramatically due to the effects of the droplet. However, outside influence region, the effect can be neglected. In addition, numerous simulations are conducted to analyze the influence factors of influence region. The analysis reveals that the influence region has a radius about 30 times the droplet radius under condition No. 2. The influence region radius increases with increasing droplet radius, temperature difference and with decreasing operating pressure, the air humidity. Finally, the expression of the influence region radius is obtained by data fitting. (C) 2018 Elsevier Ltd. All rights reserved.
机译：对于两相流的传热和传质，蒸发液滴与周围气体之间的耦合机制是一个具有挑战性的话题。通常，将质量，动量和热源项添加到气体守恒方程中，以描述液滴对气相的作用。但是，通常，源项仅施加于液滴所处的流体网格，这可能导致计算差异。因此，本研究试图研究液滴对流场的影响，以找出双向耦合机理。基于VOF模型对水滴在热空气中的蒸发进行了数值模拟，结果表明，仅液滴周围的特定流场区域会受到液滴的影响。在理论分析的基础上，提出了蒸发液滴影响区域的概念。在影响区域内，液滴周围的气体参数由于液滴的作用而急剧变化。但是，在外部影响区域中，可以忽略该影响。另外，进行了大量的模拟来分析影响区域的影响因素。分析表明，在条件2下，影响区的半径约为液滴半径的30倍。影响区半径随液滴半径，温度差的增加以及工作压力（空气湿度）的减小而增加。最后，通过数据拟合获得影响区域半径的表达式。 （C）2018 Elsevier Ltd.保留所有权利。

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