Collision coalescence of micron droplets research under direct current electric field
Lubricating oil plays an important role in industry,but the moisture in it will affect the performance and service life of the equipment.Traditional water removal methods have low efficiency and high cost.The electrostatic dehydration technology can separate the lubricating oil from the water through the action of electric field,and use the electric field to promote the collision and condensation of oil and water droplets,which has the advantages of fast,high efficiency and environmental protection.In this paper,COMSOL software was used to numerically simulate the collision aggregation of two droplets in water-in-oil emulsion,and the influence of such factors as electric field strength,temperature,particle size and droplet spacing on the collision and coalescence behavior of micron-level droplets under the action of direct current electric field was studied.The research showed that droplet coalescence time decreased rapidly with the increase of electric field strength.However,when the electric field intensity exceeds a certain value,the effect is weakened.With the increase of temperature,the droplet coalescence time decreases sharply at first,and then becomes stable after reaching a certain value.With the increase of particle size,the total time of droplet agglomeration increases slowly with the droplet diameter,and the rapid agglomeration increases when the particle size exceeds a certain value.With the increase of droplet spacing,the total coalescence time increases continuously.This paper provides theoretical basis for the study of electrostatic dehydration mechanism and technical support for the design of efficient demulsification dewatering device.
electric field demulsificationliquid-liquid aggregationdirect current electric fieldnumerical simulation
万方数据
维普
