论文标题
小滴小滴和他们居住的流程
The waltz of tiny droplets and the flow they live in
论文作者
论文摘要
本文介绍了从单个涡流中离心的小惯性颗粒的动力学。它显示了在单个涡流的附近形成的苛性形成的重要性：粒子碰撞和空隙形成。从这些单涡流研究中，我们提供了苛性数在高雷诺数湍流中的作用的估计，并且对于云的情况，估计它们如何通过桥接液滴增长的瓶颈来估计它们如何帮助雨水开始。我们简要描述了如何通过不涉及巨大记忆成本的方法来计算的贝斯 - boussinesq历史力量，并为其对湍流中的液滴的重要性提供了争论。我们讨论相变能使云湍流与其他情况下的湍流根本不同。
This article describes the dynamics of small inertial particles centrifuging out of a single vortex. It shows the importance of caustics formation in the vicinity of a single vortex: both for particle collisions and void formation. From these single-vortex studies we provide estimates of the role of caustics in high Reynolds number turbulence, and in the case of clouds, estimate how they may help in rain initiation by bridging the droplet-growth bottleneck. We briefly describe how the Basset- Boussinesq history force may be calculated by a method which does not involve huge memory costs, and provide arguments for its possible importance for droplets in turbulence. We discuss how phase change could render cloud turbulence fundamentally different from turbulence in other situations.
