基于介电泳的液滴动力学行为研究
Investigation of droplet dynamics behavior based on dielectrophoresis
郭星 1张宝生 1陈家庆 1曲柏宇 1安申法 2栾智勇 2董建宇 1石熠 1高一鸣1
作者信息
- 1. 北京石油化工学院 机械工程学院,北京 102617;北京石油化工学院 深水油气管线关键技术与装备北京市重点实验室,北京 102617
- 2. 中国石油化工股份有限公司胜利油田分公司石油工程技术研究院,山东东营 257067
- 折叠
摘要
为探究非均匀电场下液滴受介电泳作用的运动及变形,采用COMSOL MultipysicsTM软件,研究波纹板-平板电极结构下液滴的运动与变形规律,讨论平板-平板电极与波纹板-平板电极的液滴动力学差异,分析电场参数、工质参数对单个液滴运动速度及变形的影响.结果表明:随着时间增加,较平板-平板电极结构,波纹板-平板电极结构中液滴速度与变形差异逐渐增大;随着电压幅值增加,电场梯度的增大导致液滴速度增加,最高增至3.03 mm/s,同时电场力的增加导致液滴变形加剧;交流矩形波对液滴运动速度及变形的影响强于交流正弦波、交流三角波、交流锯齿波;随着油相黏度减小,液滴所受阻力减小,其运动速度及变形增大,0.2 Pa·s时液滴的最大变形量可以达到3.73;当液滴位置逐渐靠近波谷位置,其所受电场强度及电场力逐渐增加,导致液滴运动速度及形变量增加.相关结论可为原油脱水与油静电净化领域提供理论基础.
Abstract
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.
关键词
液滴/电场/相场/运动速度/变形度Key words
droplet/electric field/phase field/speed of motion/deformation degree引用本文复制引用
基金项目
国家自然科学基金面上项目(52274059)
中国石油化工股份有限公司科研项目(322035)
出版年
2024
国家科技期刊平台
NSTL
万方数据