Effect of flow field on droplets in oil under pulsed electric field
To explore the influence of flow field on droplet movement under the action of pulsed electric field,this paper builds a numerical calculation model of droplet in oil by using finite element method.The dynamic change of droplet interface is captured by phase field method,and the influence of flow field on droplet deformation and coalescence is analyzed.We find that under the action of the pulse electric field,the stretching deformation vibration of the droplet will drive the surrounding oil to form a circulation,and the circulation direction is consistent with the deformation direction of the droplet,which plays a role in promoting the deformation of the droplet.At the initial stage of the change of the deformation state of the droplet,there will be an external circulation opposite to the direction of the droplet deformation,which plays a temporary role in suppressing the deformation of the droplet.The influence of flow field on droplet coalescence is related to the distance between two droplets.When two droplets are far apart,the influence of flow field on droplet coalescence is minimal.When two droplets are close enough,the circulation outside the droplets will enable the droplets to approach each other,and then coalesce.Our results provide the theoretical support for the further study of the mechanism of pulsed electric field demulsification.
pulsed electric fieldflow fielddroplet coalescencedroplet deformationdynamic changestretching deformation vibration
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