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Direct numerical simulations of droplet condensation

机译：液滴凝结的直接数值模拟

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We present in this work well-resolved and accurate Direct Numerical Simulations (DNS) of droplet condensation. Despite the great scientific and industrial interest, to this day, there is not an extensive knowledge of the different processes involved in droplet condensation. Consequently, DNS should be considered as a promising tool to investigate on this phenomenon. A preliminary validation of our simulations is carried out by direct comparison with the quasi-static theory of the droplet condensation in an infinite vapour medium. Next, more complex configurations have been considered: the condensation of a moving droplet in a subcooled vapour flow and the condensation of a hemispherical droplet deposed on an isothermal flat surface. The latter represents a first step towards the understanding of the more demanding DropWise Condensation. In both configurations, the effects of the Jakob number,Ja, have been thoroughly analysed to understand how the condensation impacts on the droplet heat flux and dynamics. This has led to the definition of a particular condensation regime for the lower Ja values, hereinafter called low condensation rate regime, where the droplet heat transfer is independent of the Ja. By increasing theft!, instead, the effects due to condensation start to grow exponentially. This regime is referred as the high condensation rate regime in this paper. Finally, some general trends for correlations on the Nusselt number and drag coefficient accounting for condensation are proposed in this study. (C) 2018 Published by Elsevier Ltd.
机译：在这项工作中，我们提出了分辨率高且精确的液滴凝结直接数值模拟（DNS）。尽管有极大的科学和工业兴趣，但直到今天，对于液滴凝结涉及的不同过程还没有广泛的了解。因此，DNS应该被认为是对此现象进行研究的有前途的工具。通过与无限蒸气介质中液滴凝结的准静态理论直接比较，对我们的模拟进行了初步验证。接下来，已经考虑了更复杂的配置：在过冷的蒸汽流中运动的液滴的凝结和沉积在等温平面上的半球形液滴的凝结。后者代表了了解更苛刻的DropWise冷凝的第一步。在这两种配置中，已经全面分析了雅各布数Ja的影响，以了解冷凝如何影响液滴的热通量和动力学。这导致了针对较低的Ja值的特定冷凝状态的定义，在下文中称为低冷凝速率状态，其中液滴的热传递与Ja无关。相反，通过增加盗窃！，由于凝结产生的影响开始呈指数增长。该方案在本文中称为高冷凝率方案。最后，本研究提出了Nusselt数与阻力系数的相关性的一般趋势，以解决冷凝问题。 （C）2018由Elsevier Ltd.发布

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