直接数值模拟中湍流槽道流内冷凝诱导的流动结构改变
流体动力学
2020-01-28 v3
摘要
采用单相直接数值模拟，模拟了携带痕量可凝组分的流体通过差分冷却竖直槽道几何时的湍流流动。冷凝过程中潜热的释放由相互依赖的温度与蒸汽浓度源项建模，这些源项控制着系统中过量蒸汽的移除与相应的流体局部温升之间的关系。通过溶质与热浮力实现了冷凝与湍流之间的耦合。与未建模相变的相同系统模拟相比，可观察到过冷边界层因瞬态且高度局域的潜热释放而发生的改变。对相变事件前后流体的分别分析显示，相互作用后条带间距明显增大，且冷凝事件中的潜热释放抵消了槽道壁的冷却效应及相关的湍流阻尼。
引用
@article{arxiv.1909.10746,
title = {Condensation-induced flow structure modifications in turbulent channel flow investigated in direct numerical simulations},
author = {Philipp Bahavar and Claus Wagner},
journal= {arXiv preprint arXiv:1909.10746},
year = {2020}
}
备注
19 pages, 17 figures. This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Physics of Fluids 32, 015115 (2020) and may be found at https://aip.scitation.org/doi/10.1063/1.5128976