论文标题
在中间ohnesorge编号的缩回表面活性剂韧带的动力学
Dynamics of retracting surfactant-laden ligaments at intermediate Ohnesorge number
论文作者
论文摘要
在表面张力作用下缩回的韧带的动力学发生在多种自然和工业应用中，例如喷墨印刷和雾化。我们对可溶性表面活性剂进行回缩动力学的完全三维直接数值模拟。使用混合界面跟踪/级别测量方法进行完整的参数研究，该方法用于处理界面。该方法能够忠实地捕获在一定范围的韧带纵横比和ohnesorge数字上流动的特征的拓扑过渡。我们的结果证明了毛细血管之间的微妙相互作用，这是由于表面活性剂的存在，表面活性剂诱导的Marangoni应力，惯性和粘性效应所调节的。特别注意伴随回缩过程的涡流的形成，以及表面活性剂对涡流动力学的影响。
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.
