In silico investigation of the evaporation flux distribution along sessile droplet surfaces during convective drying
In silico investigation of the evaporation flux distribution along sessile droplet surfaces during convective drying
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DOI：
10.1016/j.ces.2021.116590
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发表时间：
2021-03
影响因子：
4.7
通讯作者：
M. Janocha;E. Tsotsas
中科院分区：
文献类型：
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作者：
M. Janocha;E. Tsotsas
提出了一个有限体积模型，该模型能够预测对流干燥过程中气流对固着液滴蒸发通量分布的影响。本文研究了空气中水滴在干燥过程中不同条件和不同阶段的蒸发通量分布。作为现有模型的扩展，该数值模拟考虑了流场中蒸汽的平流以及由此产生的沿液滴表面沿着的浓度梯度变化。这不仅可以表示整个对流干燥过程，而且特别是在不同阶段和不同流动条件下产生的局部蒸发。最后，在附近的另一个液滴的影响进行了分析，特别是关于表面通量分布。后者和从它评估的指数，被视为液滴中的固体传输和存款形成的指标。
A finite volume model capable of predicting the influence of gas flow on the evaporation flux profile of sessile droplets during convective drying is presented. Evaporation flux distributions originating under a variety of conditions and at various stages in the drying process of water droplets in air are investigated and quantified. As an extension to already existing models this numerical simulation takes the advection of vapor in the flow field and the hereby arising concentration gradient shift along the droplet surface into account. This allows for a representation of not only the overall convective drying process, but particularly the resulting local evaporation at different stages and under different flow conditions. Finally, the influence of another droplet present in the vicinity is analyzed with special regard to surface flux distribution. Latter, and indices evaluated from it, is seen as an indicator for solids transport in the droplet and for deposit formation.