旋转气泡环的不稳定性

IF 1 4区工程技术 Q4 MECHANICS

Comptes Rendus Mecanique Pub Date : 2020-11-16 DOI:10.5802/crmeca.22

Yonghui Xu, I. Delbende, D. Fuster, M. Rossi

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引用次数: 0

摘要

众所周知，环形气泡或圆柱形气体射流会受到瑞利-高原不稳定性的影响。然而，人们观察到白鲸和海豚产生的气泡环在很长一段时间内保持稳定。在目前的工作中，我们通过数值模拟分析了这种环形气泡的产生，特别是该过程如何依赖于表面张力。然后简要分析了它们的稳定性。对于这些动物产生的气泡的雷诺兹和韦伯数的估计，气泡内部和周围漩涡的存在被发现强烈地稳定了瑞利-高原不稳定性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Instability of a swirling bubble ring

A toroidal bubble or a cylindrical gas jet are known to be subjected to the Rayleigh-Plateau instability. Air bubble rings produced by beluga whales and dolphins however are observed that remain stable for long times. In the present work, we analyse the generation of such toroidal bubbles via numerical simulations , in particular how the process depends on surface tension. Their stability properties are then briefly analysed. For the estimated Reynolds and Weber numbers relative to the bubbles produced by these animals, the presence of a vortex inside and around the bubble is found to strongly stabilize the Rayleigh-Plateau instability .

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来源期刊

Comptes Rendus Mecanique 物理-力学

CiteScore

1.40

自引率

0.00%

发文量

审稿时长

12 months

期刊介绍： The Comptes rendus - Mécanique cover all fields of the discipline: Logic, Combinatorics, Number Theory, Group Theory, Mathematical Analysis, (Partial) Differential Equations, Geometry, Topology, Dynamical systems, Mathematical Physics, Mathematical Problems in Mechanics, Signal Theory, Mathematical Economics, … The journal publishes original and high-quality research articles. These can be in either in English or in French, with an abstract in both languages. An abridged version of the main text in the second language may also be included.