Investigation of droplet dynamics behavior based on dielectrophoresis
To explore the motion and deformation of droplets under the action of dielectrophoresis under non-uniform electric field,the motion and deformation of droplets under corrugated plate-plate electrode structure were studied by COMSOL MultipysicsTM.The difference of droplet dynamics between plate electrode and corrugated plate-plate electrode was discussed.The effects of electric field parameters and working fluid parameters on the velocity and deformation of a single droplet were analyzed.The results show that with the increase of time,the difference of droplet velocity and deformation in the corrugated plate-plate electrode structure gradually increases compared with the plate-plate electrode structure.As the voltage amplitude increases,the electric field gradient increases,and the droplet velocity gradually increases,up to 3.03 mm/s.At the same time,the increase of the electric field force leads to the intensification of droplet deformation.The influence of AC(alternating current)rectangular wave on droplet velocity and deformation is stronger than that of AC sine wave,AC triangular wave and AC sawtooth wave.As the viscosity of the oil phase decreases,the resistance of the droplet decreases,and its velocity and deformation increase.The maximum deformation of the droplet can reach 3.73 at 0.2 Pa·s.When the droplet position gradually approaches the trough position,the electric field strength and electric field force gradually increase,resulting in an increase in droplet motion and deformation.The relevant conclusions can provide a theoretical basis for the field of crude oil dehydration and oil electrostatic purification.
dropletelectric fieldphase fieldspeed of motiondeformation degree
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