电场作用下含表面活性剂液滴界面输运及变形机理OA

Combined with the ALE(arbitrary Lagrange-Euler)method,the governing equation of multiphase flow,the governing equation of electric field and the interface transport equation of surfactant,a dynamic model of surfactant-containing droplets under electric field was established,the evolution of the distribution of electric field,flow field and surfactant interfacial concentration field during droplet deformation was clarified,and the influence of surfactant adsorption capacity and continuous phase viscosity on the uneven distribution of surfactant interface during droplet deformation was obtained.Within the studied steady-state deformation regime,the simulation results predicted by the dynamic mesh method showed excellent agreement with experimental data,validating the accuracy of the proposed model.The results showed that four symmetrical circulations were formed inside the droplets under the action of electric field,which promoted the accumulation of surfactants from the belly of the droplets to both ends of the droplets.With the increase of the adsorption ratio of surfactant(Г*>0.1),Marangoni stress gradually dominated,and the surfactant was transported in the opposite direction.The viscosity of the oil phase mainly affected the migration time and direction of the surfactant during the change process.The results of this study could provide theoretical guidance for the study of complex engineering current fluid dynamics such as electrostatic dehydration,electrostatic spray,and microfluidics.