Dynamics of retracting surfactant-laden ligaments at intermediate Ohnesorge number
Dynamics of retracting surfactant-laden ligaments at intermediate Ohnesorge number
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DOI：
10.1103/physrevfluids.5.084007
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发表时间：
2020-01
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影响因子：
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通讯作者：
C. Constante-Amores;L. Kahouadji;A. Batchvarov;Seungwon Shin;J. Chergui;D. Juric;O. Matar
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文献类型：
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作者：
C. Constante-Amores;L. Kahouadji;A. Batchvarov;Seungwon Shin;J. Chergui;D. Juric;O. Matar
韧带在表面张力作用下的收缩动力学在许多自然和工业应用中都会发生，例如喷墨打印和雾化。我们对可溶性表面活性剂的回缩动力学进行了全三维、两相直接数值模拟。使用混合界面跟踪/水平集方法进行全参数研究，该方法用于处理界面；该方法能够在一定范围的韧带长宽比和Ohnesorge数范围内真实地捕捉作为流动特征的拓扑转变。我们的结果证明了由表面活性剂的存在所调节的毛细作用、表面活性剂引起的Marangoni应力、惯性效应和粘性效应之间的微妙相互作用。特别注意了伴随着回缩过程的旋涡的形成，以及表面活性剂对旋涡动力学的影响。
The dynamics of ligaments retracting under the action of surface tension occurs in a multitude of natural and industrial applications, such as inkjet printing and atomisation. We perform fully three-dimensional, two-phase direct numerical simulations of the retraction dynamics with soluble surfactants. A full parametric study is performed using a hybrid interface-tracking/level-set method, which is utilised to treat the interface; this method is capable of capturing faithfully the topological transitions that are a feature of the flow over a certain range of ligament aspect ratios and Ohnesorge numbers. Our results demonstrate the delicate interplay between capillarity, modulated by the presence of surfactants, surfactant-induced Marangoni stresses, inertial and viscous effects. Particular attention is paid to the formation of vortices, which accompany the retraction process, and the influence of surfactant on the vortex dynamics.