How small droplets form in turbulent multiphase flows

IF 2.5 3区 物理与天体物理 Q2 PHYSICS, FLUIDS & PLASMAS Physical Review Fluids Pub Date : 2024-07-29 DOI:10.1103/physrevfluids.9.l072301
M. Crialesi-Esposito, G. Boffetta, L. Brandt, S. Chibbaro, S. Musacchio
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Abstract

The formation of small droplets and bubbles in turbulent flows is a crucial process in geophysics and engineering, whose underlying physical mechanism remains a puzzle. In this Letter, we address this problem by means of high-resolution numerical simulations, comparing a realistic multiphase configuration with a numerical experiment in which we attenuate the presence of strong velocity gradients either across the whole mixture or in the disperse phase only. Our results show unambiguously that the formation of small droplets is governed by the internal dynamics which occurs during the breakup of large drops and that the high vorticity and the extreme dissipation associated to these events are the consequence and not the cause of the breakup.

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小液滴如何在湍流多相流中形成
在湍流中形成小液滴和气泡是地球物理学和工程学中的一个关键过程,其基本物理机制仍然是一个谜。在这封信中,我们通过高分辨率数值模拟解决了这一问题,将现实的多相配置与数值实验进行了比较,在实验中,我们削弱了整个混合物或仅在分散相中存在的强速度梯度。我们的结果明确显示,小液滴的形成受大液滴破裂时发生的内部动力学的支配,与这些事件相关的高涡度和极度耗散是破裂的结果而不是原因。
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来源期刊
Physical Review Fluids
Physical Review Fluids Chemical Engineering-Fluid Flow and Transfer Processes
CiteScore
5.10
自引率
11.10%
发文量
488
期刊介绍: Physical Review Fluids is APS’s newest online-only journal dedicated to publishing innovative research that will significantly advance the fundamental understanding of fluid dynamics. Physical Review Fluids expands the scope of the APS journals to include additional areas of fluid dynamics research, complements the existing Physical Review collection, and maintains the same quality and reputation that authors and subscribers expect from APS. The journal is published with the endorsement of the APS Division of Fluid Dynamics.
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