Non-coalescence of oppositely charged droplets in viscous oils
Non-coalescence of oppositely charged droplets in viscous oils
复制标题
粘性油中带相反电荷的液滴不聚结
DOI：
10.1063/1.5109181
复制
发表时间：
2019-07-08
影响因子：
4
通讯作者：
Kong, Tiantian
中科院分区：
文献类型：
--
作者：
Chen, Xue;Liu, Peng;Kong, Tiantian
相反带电的液滴合并或夹断，取决于发生不合并的临界角度。对于无粘介电相中的带电液滴，临界角是恒定的；液滴的性质和外加电场强度无关。在本文中，我们发现对于稠油体系中的带电液滴，聚结到夹点转变的临界角随着原油粘度的增加而增加。通过平衡带电、粘滞和界面张力的影响，我们开发了一个简单而有效的模型来解释带电液滴在粘性油中的电流体动力学行为。我们进一步验证了该模型的预测，证明了接触电场强度和水/油界面张力也影响临界角。我们的系统研究为理解粘性介电相中带电液滴的电流体动力学提供了重要的见解；结果可能启发各种应用中控制带电液滴的方法。相反带电的液滴合并或夹断，取决于发生不合并的临界角度。对于无粘介电相中的带电液滴，临界角是恒定的；液滴的性质和外加电场强度无关。在本文中，我们发现对于稠油体系中的带电液滴，聚结到夹点转变的临界角随着原油粘度的增加而增加。通过平衡带电、粘滞和界面张力的影响，我们开发了一个简单而有效的模型来解释带电液滴在粘性油中的电流体动力学行为。我们进一步验证了该模型的预测，证明了接触电场强度和水/油界面张力也影响临界角。我们的系统研究为理解带电液滴在粘性介质相中的电流体动力学提供了重要的见解，其结果可以启发控制带电液滴的方法。
Oppositely charged droplets coalesce or pinch off, depending on a critical angle upon which noncoalescence occurs. For charged droplets in inviscid dielectric phases, the critical angle is constant; droplet properties and the applied electric field strength are irrelevant. In this paper, we find that for charged droplets in viscous oil systems, the critical angle for coalescence-to-pinch-off transition increases as the oil viscosity increases. We develop a simple yet effective model to account for electrohydrodynamic behaviors of charged droplets in viscous oils by balancing electric, viscous, and interfacial tension effects. We further verify the predictions of this model by demonstrating that the contacting electric field strength and water/oil interfacial tension also affect the critical angle. Our systematic investigations provide important insights into understanding electrohydrodynamics of charged droplets in viscous dielectric phases; the results could inspire methods to control electrified droplets for various applications.Oppositely charged droplets coalesce or pinch off, depending on a critical angle upon which noncoalescence occurs. For charged droplets in inviscid dielectric phases, the critical angle is constant; droplet properties and the applied electric field strength are irrelevant. In this paper, we find that for charged droplets in viscous oil systems, the critical angle for coalescence-to-pinch-off transition increases as the oil viscosity increases. We develop a simple yet effective model to account for electrohydrodynamic behaviors of charged droplets in viscous oils by balancing electric, viscous, and interfacial tension effects. We further verify the predictions of this model by demonstrating that the contacting electric field strength and water/oil interfacial tension also affect the critical angle. Our systematic investigations provide important insights into understanding electrohydrodynamics of charged droplets in viscous dielectric phases; the results could inspire methods to control electrified droplet...