论文标题
表面活性剂溶解度对直流电场中粘性下降的流体动力学的影响
Effects of Surfactant Solubility on the Hydrodynamics of a Viscous Drop in a DC Electric Field
论文作者
论文摘要
表面活性剂（两亲性表面活性剂）的物理化学通常用于控制粘性滴和气泡的动力学。表面活性剂吸附动力学已被证明在伸展和剪切流的滴剂变形中起着至关重要的作用，但据我们所知，这些动力学对没有考虑到电场中粘性下降的影响。在本文中，我们从数值上研究了吸附动力学对电场中表面活性剂覆盖的粘液滴的影响。在内部和外部流体之间的一系列电导率和介电常数上，我们专注于变形和流动对传输参数$ j $的依赖性，而Biot Number $ \ text {bi} $，这些{BI} $表征了滴表面之间表面活性剂交换程度的程度。我们的发现表明，当我们确定（1）表面活性剂溶解度可能会改变滴水液的下降变形和循环时，溶解度会以不同的方式影响粘性下降的电水力动力学，并且（2）表面活性剂溶解度主要影响流动，主要影响流动和变形。
The physico-chemistry of surfactants (amphiphilic surface active agents) is often used to control the dynamics of viscous drops and bubbles. Surfactant sorption kinetics has been shown to play a critical role in the deformation of drops in extensional and shear flows, yet to the best of our knowledge these kinetics effects on a viscous drop in an electric fieldhave not been accounted for. In this paper we numerically investigate the effects of sorption kinetics on a surfactant-covered viscous drop in an electric field. Over a range of electric conductivity and permittivity ratios between the interior and exterior fluids, we focus on the dependence of deformation and flow on the transfer parameter $J$, and Biot number $\text{Bi}$ that characterize the extent of surfactant exchange between the drop surface and the bulk. Our findings suggest solubility affects the electrohydrodynamics of a viscous drop in distinct ways as we identify parameter regions where (1) surfactant solubility may alter both the drop deformation and circulation of fluid around a drop, and (2) surfactant solubility affects mainly the flow and not the deformation.
