含有表面活性剂的气泡破裂:大邦德数下的毛细管波和沃辛顿射流动力学

IF 2.5 3区 物理与天体物理 Q2 PHYSICS, FLUIDS & PLASMAS Physical Review Fluids Pub Date : 2024-08-22 DOI:10.1103/physrevfluids.9.083606
P. Pico, L. Kahouadji, S. Shin, J. Chergui, D. Juric, O. K. Matar
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引用次数: 0

摘要

我们对气泡破裂形成气溶胶之前的主要阶段进行了数值研究:毛细管波沿气泡传播、在气泡顶点汇聚、沃辛顿射流上升及其破裂释放液滴。我们重点研究了系统中两个关键但却被忽视的方面:表面活性物质的存在和由不可忽略的引力效应(以邦德数量化)驱动的动力学。我们的研究结果提出了表面活性剂存在时毛细管波延迟的解释机制,其中涉及从双向马兰戈尼应力到单向马兰戈尼应力的转变。我们还定量阐释了毛细管波速度随各种表面活性剂参数(包括表面活性剂溶解度和弹性)变化的性质,这与清洁界面中记录的恒定行为不同。
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Surfactant-laden bubble bursting: Dynamics of capillary waves and Worthington jet at large Bond number
We present a numerical study of the main substages preceding aerosol formation via bursting bubbles: capillary wave propagation along the bubble, convergence at the bubble's apex, and the ascent of a Worthington jet and its breakup to release liquid drops. We focus on two crucial yet overlooked aspects of the system: the presence of surface-active agents and dynamics driven by non-negligible gravitational effects, quantified by the Bond number. Our results propose a mechanism explaining capillary wave retardation in the presence of surfactants, involving the transition from bi- to unidirectional Marangoni stresses, which pull the interface upwards, countering the motion of the waves. We also quantitatively elucidate the variable nature of the waves' velocity with various surfactant parameters, including surfactant solubility and elasticity, a departure from the constant behavior well documented in clean interfaces.
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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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