论文标题
通过界面破裂的充满表面活性剂气泡的动力学
Dynamics of a surfactant-laden bubble bursting through an interface
论文作者
论文摘要
我们研究表面活性剂对通过界面爆发的气泡动力学的影响。我们使用混合界面跟踪/级别测量方法对表面活性剂诱导的Marangoni应力，吸附动力学和扩散效应进行全部三维直接数值模拟。我们选择一个对应于较大的拉普拉斯数和消失的键数来忽略重力的初始气泡形状，并隔离表面活性剂对流动的影响。我们的结果表明，表面活性剂的存在通过Marangoni诱导的流动影响系统的动力学，从高浓度区域驱动运动，这是导致靠近自由表面的再循环区域的开始。这些Marangoni强调将界面固化，延迟腔体塌陷并影响喷气破裂过程。
We study the effect of surfactant on the dynamics of a bubble bursting through an interface. We perform fully three-dimensional direct numerical simulations using a hybrid interface-tracking/level-set method accounting for surfactant-induced Marangoni stresses, sorption kinetics, and diffusive effects. We select an initial bubble shape corresponding to a large Laplace number and a vanishingly small Bond number in order to neglect gravity, and isolate the effects of surfactant on the flow. Our results demonstrate that the presence of surfactant affects the dynamics of the system through Marangoni-induced flow, driving motion from high to low concentration regions, which is responsible for the onset of a recirculation zone close to the free surface. These Marangoni stresses rigidify the interface, delay the cavity collapse, and influence the jet breakup process.
