Influence of alkali concentration, electric waveform, and frequency on the critical electric field strength of droplet-interface partial coalescence
Influence of alkali concentration, electric waveform, and frequency on the critical electric field strength of droplet-interface partial coalescence
复制标题
碱浓度、电波形和频率对液滴界面部分聚结临界电场强度的影响
DOI：
10.1016/j.ces.2019.07.054
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发表时间：
2019
影响因子：
4.7
通讯作者：
Lu Yuling
中科院分区：
文献类型：
--
作者：
Sun Yongxiang;Yang Donghai;He Limin;Luo Xiaoming;Lu Yuling
在电脱水过程中，电场强度应设置在临界值（Ecrit）以下，以抑制液滴-界面部分聚结。三元复合驱中碱的存在会改变采出液的电性，从而影响Ecrit。有鉴于此，本研究探讨了Na2CO3溶液浓度、电场波形和频率对Ecrit均方根（RMS）值的影响。结果表明，Na2CO3浓度的增加会使Ecrit增加，这是由于溶液电导率的增加影响了聚结过程中的电荷转移。离子的对流与流体渗透到体相和Na2CO3浓度的增加降低的渗透速度。此外，增加AC或脉冲电场频率可以增加Ecrit，并且最佳波形（即，随着频率的变化而变化。这些研究结果将有助于优化电聚结系统。
During the process of electro-dehydration, the electric field strength should be set below a critical value (Ecrit) to inhibit droplet–interface partial coalescence. The alkali present in alkaline–surfactant–polymer flooding may affectEcritbecause they change the electrical properties of produced liquids. In view of this, this study investigated the effects of Na2CO3solution concentration, electric field waveform, and frequency on the root mean square (RMS) values ofEcrit. The results show that elevated Na2CO3concentrations increaseEcrit, owing to the enhanced solution conductivity which may affect the charge transfer during coalescence. The convection of ions is associated with penetration of fluid into the bulk phase and an increase in Na2CO3concentration decreases the penetration velocity. Moreover, increasing the AC or pulsed electric field frequency can increaseEcrit, and the optimal waveform (i.e., with the largestEcrit) varies with frequency. These findings will be useful for optimizing electro-coalescence systems.