Effects of surfactant solubility on the hydrodynamics of a viscous drop in a dc electric field

Herve Nganguia, Wei Fan Hu, Ming Chih Lai, Y. N. Young

研究成果: 雜誌貢獻期刊論文同行評審

3 引文 斯高帕斯(Scopus)

摘要

Surfactants (amphiphilic surface active agents) are often used to control the dynamics of viscous drops and bubbles in microfluidics applications. 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 field have 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 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 alters both the drop deformation and circulation of fluid around a drop and (2) surfactant solubility affects mainly the flow and not the deformation.

原文???core.languages.en_GB???
文章編號064004
期刊Physical Review Fluids
6
發行號6
DOIs
出版狀態已出版 - 6月 2021

指紋

深入研究「Effects of surfactant solubility on the hydrodynamics of a viscous drop in a dc electric field」主題。共同形成了獨特的指紋。

引用此