The interaction effects between droplets condensing from moist air using a distributed point sink method
The interaction effects between droplets condensing from moist air using a distributed point sink method
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DOI：
10.1051/e3sconf/201912801005
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发表时间：
2019-09
影响因子：
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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
在模拟滴状冷凝时，通常假设液滴的生长是孤立的形式。然而，对于湿空气的滴状冷凝，水蒸气从周围到液滴表面的扩散将受到邻近液滴的阻挡效应的极大影响。与孤立液滴模型相比，受水蒸气影响的空间分布完全决定了不同的凝结率。在这项工作中，开发了一种分布式点法（DPSM）作为格林函数的方法来捕获液滴的相互作用效应，而不需要求解扩散方程和数值离散。由于其性质，自动满足的边界条件确保了基于唯一性定理的求解精度。通过处理一系列液滴阵列来研究液滴之间相互作用效应的重要特征。在逐滴冷凝过程中，考虑包含多达 1000 个液滴的典型液滴阵列。结果表明，液滴之间的相互作用效应对于准确预测不凝性气体存在下滴状冷凝的冷凝行为至关重要。
In modelling dropwise condensation, growth of the droplet is frequently assumed in an isolated form. However, for dropwise condensation of moist air the vapor diffusion from the surrounding to the droplet surface will be tremendously influenced by the blocking effect of the neighboring droplets. The influenced spatial distribution of water vapor totally determines a different condensation rate comparing with that by the isolated droplet model. In this work, a distributed point method (DPSM) as the methodof Green function is developed to capture the interaction effects of droplets without requiring solution of the diffusion equation and the numerical discretization. Due to its nature, the automaticallysatisfied boundary conditions make sure the solution accuracy based on the uniqueness theorem. The significant characteristics for the interaction effects between droplets are investigated by handling a series of droplet arrays. During dropwise condensation, a typical droplet array containing up to 1000 droplets is considered. The results indicate that the interaction effect between droplets is critical in accurately predicting the condensation behavior for dropwise condensation in the presence of non-condensable gas.