Single droplet condensation in presence of non-condensable gas by a multi-component multi-phase thermal lattice Boltzmann model
Single droplet condensation in presence of non-condensable gas by a multi-component multi-phase thermal lattice Boltzmann model
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DOI：
10.1016/j.ijheatmasstransfer.2019.04.135
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发表时间：
2019-08
影响因子：
5.2
通讯作者：
Shaofei Zheng;F. Eimann;C. Philipp;T. Fieback;U. Gross
中科院分区：
文献类型：
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作者：
Shaofei Zheng;F. Eimann;C. Philipp;T. Fieback;U. Gross
建立了一个考虑汽液相变的多组分多相热格子Boltzmann模型，用于研究不凝性气体存在下的液滴凝结。通过一个孤立液滴的蒸发实验，验证了该模型对多组分多相汽液相变流动的模拟能力。在此基础上，研究了不凝性气体在不同不凝性组分质量分数和接触角条件下的单液滴凝结。结果表明，不凝气体对液滴凝结传热的影响与不凝气体的生长阶段和含量有关。随着液滴凝结的进行，蒸汽和不凝组分的传质趋于平衡状态。此外，对于不同的接触角，接触线的动态行为在不凝性组分的累积效应中起关键作用。无论添加不凝组分与否，亲水性基质对液滴冷凝传热的促进作用均大于疏水性基质。在不同的条件下，用幂律拟合液滴半径随时间的变化规律，对液滴生长速率进行数学定义。
A multi-component multi-phase thermal lattice Boltzmann model considering vapor-liquid phase change is developed to study droplet condensation with the presence of non-condensable gas. Some tests, including an isolated droplet evaporation, are conducted to verify the capability of this model in simulating multi-component multi-phase flow with vapor-liquid phase change. After that, single droplet condensation considering non-condensable gas is investigated with different mass fraction of non-condensable component and contact angles. The results show that the influence of the non-condensable gas upon droplet condensation heat transfer is depended on the growth stage and the amount of the non-condensable gas. The mass transfer of vapor and non-condensable component will tend to an equilibrium state with the droplet condensation going. Furthermore, for different contact angles, the dynamic behavior of the contact line plays a critical role in the accumulation effect of the non-condensable component. And the heat transfer of droplet condensation is enhanced by the hydrophilic substrate rather than the hydrophobic substrate as expected, no matter adding the non-condensable component or not. In different conditions, the power law, which fits the droplet radius with time, is used to define the growth rate mathematically.