文献类型：期刊文献

英文题名：Demulsification characteristics of electrostatic-swirling coupling enhanced migration

作者：Chen, Guidong[1];Feng, Silong[1];Liu, Shuo[1];Li, Lin[1];Long, Xiangyi[1];Yang, Qiang[1];Lu, Hao[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China

年份：2025

卷号：75

外文期刊名：JOURNAL OF WATER PROCESS ENGINEERING

收录：;EI(收录号：20250109623);WOS:【SCI-EXPANDED(收录号:WOS:001498524800003)】；

基金：This work was supported by the National Natural Science Foundation of China (Grant Nos. 52370077 and 52025103) and the Shanghai Rising Star Program (Grant No. 22QA1402600) .

语种：英文

外文关键词：Water-in-oil emulsion; Electrostatic-swirling coupling; Droplet migration mechanism; Electrode insulation modification; Demulsification characteristics

摘要：Currently, achieving efficient demulsification of water-in-oil emulsions using physical methods is a great challenge in the field of oil-water separation. Herein, an electrostatic-swirling demulsifier, designed based on the principle of enhancing droplet migration through electrostatic-swirling coupling was combined with electrode insulation modification to regulate the droplet capture mode. Through multiphysics simulations and experimental tests, it was first clarified that the electric field force dominates the migration of water droplets to the side wall in the electrostatic-swirling coupling. The electric field force is 1.43-4.11 times of the centrifugal force. Secondly, the relationship between the migration trajectory of droplets, electric field, surface charge density, and continuous phase characteristics was articulated. The migration trajectory is affected by various factors. As the voltage (1 kV to 8 kV), surface charge density (1 x 10-5C/m2 to 5 x 10-5C/m2) and continuous phase viscosity (11 cP to 6 cP) change, the migration time and angle of water droplets decrease significantly, from 52 ms and 210 degrees to 14 ms and 50 degrees, respectively. This shift causes the "collision site" to move far away from the continuous phase outlet, enabling the insulating modified film on the side wall to quickly capture and separate the water droplets. Further investigation into the macroscopic demulsification characteristics revealed that the separation efficiency of the dual-field coupling electrode insulation modification system increased from 11.84 % to 95.75 % after applying 5 kV voltage to the emulsions containing 600-2200 mg/L water. This study provides a new approach for compact and efficient demulsification of oil-water emulsions.