文献类型：期刊文献

英文题名：Droplets-liquid layer coalescence in the coupling of rotating electric and rotating flow fields

作者：Li, Bin[1];Bai, Jin[1];Wu, Yan[1];Dou, Xiaohui[1,2];Sun, Zhiqian[3];Lu, Hao[4];Wang, Zhentao[1];Wang, Zhenbo[3];Wang, Junfeng[1,5]

机构：[1]Jiangsu Univ, Sch Energy & Power Engn, Zhenjiang 212013, Peoples R China;[2]Jiangsu Oilfield Co, Petr Engn Technol Res Inst Sinopec, Yangzhou 225009, Peoples R China;[3]China Univ Petr East China, State Key Lab Heavy Oil, Qingdao 266580, Peoples R China;[4]East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China;[5]Chongqing Univ, Sch Energy & Power Engn, Chongqing 400044, Peoples R China

年份：2025

卷号：37

期号：10

外文期刊名：PHYSICS OF FLUIDS

收录：;EI(收录号：20254319357759);WOS:【SCI-EXPANDED(收录号:WOS:001596935800022)】；

基金：This work was supported by the National Natural Science Foundation of China (No. 52206199).

语种：英文

外文关键词：Chains - Coalescence - Crude oil - Dehydration - Drop formation - Efficiency - Flow fields

摘要：The electric dehydration method offers strong controllability and high efficiency, providing a pathway to address the challenge of deep dehydration in crude oil. In this paper, the molecular dynamics method was employed to study the droplets-liquid layer (D-L) coalescence dynamics in the rotating electric and rotating flow coupled (RE&RF) fields. The effects of rotating flow (RF) field intensity, rotating electric (RE) field strength and frequency, nanoparticles (NPs), and surfactants on the D-L coalescence process were systematically analyzed. The results show that increasing the RF field intensity enhances the coalescence efficiency. However, excessively high angular velocities (omega(f)* >= 10.43) are not favorable for high water content (w >= 4.02 vol. %) systems. Compared with the direct current field, RE fields can destabilize water chains and promote complete coalescence by periodically altering the field direction. For low w (<= 4.02 vol. %), high-frequency RE fields can be adopted to improve the coalescence efficiency; whereas, for high w (>= 6.02 vol. %), low-frequency RE fields (omega(E)* <= 2.5) can effectively suppress the formation of water chains. The 45 degrees angular interval RE fields (RE_45 degrees) effectively promote the complete D-L coalescence at both low and high omega(E)*. Furthermore, the coupled RE_45 degrees&RF fields exhibit superior performance in enhancing coalescence. The existence of Span-80 surfactants can effectively inhibit the effect of SiO2 NPs in reducing the coalescence efficiency. This study elucidates the microscopic mechanisms by which coupled RE&RF fields enhance the D-L coalescence and identifies the optimal conditions for electric dehydration. The findings provide theoretical guidance for addressing the challenges of optimizing high-efficiency and compact oil-water separators.