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Effect of moderate DC electric field on formation of surfactant-laden drops
Chemical Engineering Research and Design ( IF 3.7 ) Pub Date : 2020-03-14 , DOI: 10.1016/j.cherd.2020.03.009
N. Kovalchuk , F. Alberini , M.J.H. Simmons

The continuous formation of mm-scale surfactant-laden aqueous drops in oil was studied under an applied DC electric field of 0–267 kV/m. The parameters varied included the flow rate of dispersed phase, the electric field strength, the viscosities and densities of dispersed and continuous phase and the surfactant type (anionic or cationic) and concentration. An increase in the electric field strength resulted in a decrease of the drop size due to increasing stresses on the drop interface. The size reduction continued until transition to the irregular regime. The values of critical electric field strength for this transition increased with an increase in both the flow rate and the viscosity ratio between the dispersed and continuous phase. The critical electric field strength and the size of the drops formed in the periodic dripping regime were independent of the electric field polarity. The effect of the electric field increased with a decrease of interfacial tension and density difference between the dispersed and continuous phase.



中文翻译:

适度的直流电场对载有表面活性剂的液滴形成的影响

在0-267 kV / m的施加直流电场下,研究了油中毫米级负载表面活性剂的水滴的连续形成。变化的参数包括分散相的流速,电场强度,分散相和连续相的粘度和密度以及表面活性剂类型(阴离子或阳离子)和浓度。电场强度的增加由于液滴界面上的应力增加而导致液滴尺寸减小。尺寸的减小一直持续到过渡到不规则状态。该转变的临界电场强度的值随着分散相和连续相之间的流速和粘度比的增加而增加。临界电场强度和在周期性滴落状态下形成的液滴的大小与电场极性无关。电场的影响随着分散相和连续相之间的界面张力和密度差的减小而增加。

更新日期:2020-03-14
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