摘要
为了研究电脱水过程中水滴的微观变形形态,基于相场法建立电场作用下油包水乳状液中水滴聚并和变形行为的数值模型,采用王亮等的实验参数以验证该模型的准确性。结果表明:在匀强电场作用下,油包水乳状液中水滴粒径越大,油水界面张力越小,电压越大,电场作用下水滴的变形度越大,且电压对液滴变形影响最大,界面张力影响最小。在该文研究条件下,最优电压大小为14 kV,最优界面张力为0.024 mN·m^(-1)。在非匀强电场作用下,方波作用下液滴的聚并速度最快,正弦波次之,锯齿波最差,最短聚并时间为0.14s。此外,增大液滴聚并的稳定性需要同时考虑入口流速和电场强度作用,在入口流速在0.01~0.08 m·s^(-1)时,电场强度需要控制在440~700 V·mm^(-1)。
In order to study the micro-deformation of water droplets in the process of electric dehydration,a numerical model for the coalescence and deformation in oil-in-water emulsion under the action of electric field was established based on phase field method.The experimental parameters from WANG Liang were used to verify the model.The results showed that if the particle size of droplets in the oil-in-water emulsion was larger,the interfacial tension between oil and water was smaller,the voltage was greater,the larger the degree of deformation was obtained under a uniform electric field.The voltage had the biggest influence on the droplet deformation,the interfacial tension had the smallest influence.Under the conditions studied,the optimal voltage was 14 kV and the optimal interfacial tension was 0.024 mN·m^(-1).Under the non-uniform electric field,the agglomeration speed of droplet under the square wave was the fastest,sine wave was the second,sawtooth wave was the worst and the shortest coalescence time was 0.14 s.To increase the stability of droplet coalescence,both the inlet velocity and the electric field intensity should be taken into account.When the inlet velocity was 0.01~0.08 m·s^(-1),the electric field intensity should be controlled at 440~700 V·mm^(-1).The increase of the inlet velocity will accelerate the initial contact time of the droplet.
作者
黄斌
丁畅
周万富
黄立凯
付思强
贺世博
HUANG Bin;DING Chang;ZHOU Wan-fu;HUANG Li-kai;FU Si-qiang;HE Shi-bo(College of Petroleum Engineering,Northeast Petroleum University,Daqing 163318,China;Post-doctoral Research Station of PetroChina Daqing Oilfield Company,Daqing 163458,China;The Oil Production Engineering Research Institute of Daqing Oilfield Company,Daqing 163002,China;No.2 Oil Production Plant in Daqing Oilfield Company,Daqing 163414,China)
出处
《当代化工》
CAS
2021年第8期1784-1789,1793,共7页
Contemporary Chemical Industry
基金
国家自然科学基金(项目编号:51974088)
东北石油大学优秀中青年科研创新团队项目(项目编号:KYCXTD202002)。
关键词
离散相液滴
聚并
相场方法
变形
Dispersed phase droplet
Coalescence
Phase field method
Deformation
