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arXiv 2005.00170physics.flu-dyn
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表面活性剂溶解度对DC电场中粘性液滴流体力学的影响

Effects of Surfactant Solubility on the Hydrodynamics of a Viscous Drop in a DC Electric Field

H. Nganguia, W. -F. Hu, M. -C. Lai, Y. -N. Young

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液滴和气泡的动力学。表面活性剂吸附动力学已被证明在拉伸和剪切流中的液滴变形中起着关键作用,但据我们所知,这些动力学效应对电场中的粘性液滴的影响尚未被考虑。在本文中,我们数值研究吸附动力学的影响,表面覆盖的粘性滴在电场。在一个范围内的内部和外部流体之间的电导率和介电常数比,我们专注于变形和流动的依赖性上的传输参数$J$,和Biot数$\text{Bi}$,其特征的表面活性剂之间的液滴表面和散装交换的程度。我们的研究结果表明,溶解度影响的电流体动力学的粘性下降,在不同的方式,我们确定参数区域,其中(1)表面活性剂的溶解度可能会改变这两个下降变形和周围的流体循环的下降,和(2)表面活性剂的溶解度主要影响的流量,而不是变形。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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