Unraveling the Secrets of Turbulence in a Fluid Puff
Unraveling the Secrets of Turbulence in a Fluid Puff
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DOI：
10.1103/physrevlett.127.094501
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发表时间：
2021-08-25
影响因子：
8.6
通讯作者：
Rosti, Marco Edoardo
中科院分区：
文献类型：
--
作者：
Mazzino, Andrea;Rosti, Marco Edoardo
湍流喷流在日常生活中是普遍存在的现象。了解它们的动态在从工业过程到纯科学和应用科学的各种情况下都很重要。在所有这些领域中，温度和速度时空波动的统计结构的深入了解对于构建化学反应（化学）和含病毒液滴冷凝（病毒学和/或生物物理学）模型以及工业应用中的最佳混合策略至关重要。事实上，喷烟中的湍流结果限于整体性质（即，平均喷烟速度和典型的衰减或增长时间），并且可以追溯到20世纪后半叶。因此，要从整体性质过渡到两点统计观测值，还有一个巨大的空白需要填补。在这里，我们填补了这一空白，利用理论和数值一致预测和验证的时空标度行为的速度和温度的结构函数，包括不透明度修正。理论和模拟之间的良好协议found. Our结果预计将有深远的影响，发展蒸发模型的含病毒的液滴进行的湍流puff，与利益的理解的空气传播的病毒传染途径。
Turbulent puffs are ubiquitous in everyday life phenomena. Understanding their dynamics is important in a variety of situations ranging from industrial processes to pure and applied science. In all these fields, a deep knowledge of the statistical structure of temperature and velocity space-time fluctuations is of paramount importance to construct models of chemical reaction (in chemistry) and of condensation of virus-containing droplets (in virology and/or biophysics) and optimal mixing strategies in industrial applications. As a matter of fact, results of turbulence in a puff are confined to bulk properties (i.e., average puff velocity and typical decay or growth time) and date back to the second half of the 20th century. There is, thus, a huge gap to fill to pass from bulk properties to two-point statistical observables. Here, we fill this gap by exploiting theory and numerics in concert to predict and validate the space-time scaling behaviors of both velocity and temperature structure functions including intermittency corrections. Excellent agreement between theory and simulations is found. Our results are expected to have a profound impact on developing evaporation models for virus-containing droplets carried by a turbulent puff, with benefits to the comprehension of the airborne route of virus contagion.