论文标题
连接冷凝水液滴作为通道流的直接数值模拟中的准静态壁变形
Sessile condensate droplets as quasi-static wall deformations in direct numerical simulations of channel flow with condensation
论文作者
论文摘要
由于在环境条件下空气中普遍存在湿度，凝结是许多流动应用的重要方面。对于此类流的直接数值模拟，将模拟气相模拟为以温度和湿度为特征的混合物，并通过释放和吸收潜热来产生与成本降低的多相直接数值模拟一致的结果。基于表面的潜在凝结速率将其为准静态变形进行建模为准静态变形，从而扩展了单相方法，以包括液滴和流量之间的相互作用，同时仅保留仅模拟气相的优势。湍流通过和不带有液滴的冷却，垂直通道的模拟结果显示，由于存在冷凝水液滴，在液滴的附近和整个通道都增加了热和蒸气的湍流运输。特别是，壁的对称性的破裂使凝结从周围区域转移到液滴表面。
Condensation is an important aspect of many flow applications due to the universal presence of humidity in the air at ambient conditions. For direct numerical simulations of such flows, simulating the gas phase as a mixture characterized by temperature and humidity coupled by the release and absorption of latent heat has been shown to yield results consistent with multiphase direct numerical simulations at reduced costs. Modeling sessile droplets as quasi-static deformations based on the underlying condensation rates at the surface extends the single-phase approach to include the interaction between droplets and flow while retaining the advantages of simulating the gas phase only. The results of simulations of turbulent flow through a cooled, vertical channel with and without droplets show increased turbulent transport of heat and vapor due to the presence of condensate droplets, both in the immediate vicinity of the droplets and for the channel as a whole. In particular, the breaking of the symmetry of the wall shifts condensation from the surrounding areas onto the droplet surfaces.
