电场和剪切场耦合作用下双液滴聚结数值模拟

doi:10.7623/syxb201502014

石油学报 ›› 2015, Vol. 36 ›› Issue (2): 238-245.DOI: 10.7623/syxb201502014

电场和剪切场耦合作用下双液滴聚结数值模拟

吕宇玲¹, 田成坤¹, 何利民¹, 张倩², 王朝霞²

1. 中国石油大学储运与建筑工程学院山东青岛 266580;
2. 中国石油集团工程设计有限责任公司北京迪威尔石油天然气技术开发有限公司北京 100083

收稿日期:2014-06-13 修回日期:2014-11-14 出版日期:2015-02-25 发布日期:2015-02-05
通讯作者: 吕宇玲,女,1971年9月生,1995年获石油大学(华东)学士学位,2012年获中国石油大学(华东)博士学位,现为中国石油大学(华东)教授、硕士生导师,主要从事多相管流及油气田集输技术研究与教学工作。Email:lyl8391811@163.com
作者简介:吕宇玲,女,1971年9月生,1995年获石油大学(华东)学士学位,2012年获中国石油大学(华东)博士学位,现为中国石油大学(华东)教授、硕士生导师,主要从事多相管流及油气田集输技术研究与教学工作。Email:lyl8391811@163.com
基金资助:
国家自然科学基金项目(No.51274233)资助。

Numerical simulations on the double-droplets coalescence under the coupling effects of electric field and shearing field

Lü Yuling¹, Tian Chengkun¹, He Limin¹, Zhang Qian², Wang Zhaoxia²

1. College of Pipeline and Civil Engineering, China University of Petroleum, Shandong Qingdao 266580, China;
2. DWELL Company Limited, CNPC Engineering Company Limited, Beijing 100083, China

Received:2014-06-13 Revised:2014-11-14 Online:2015-02-25 Published:2015-02-05

摘要/Abstract

摘要：

静电聚结设备中的液滴行为属于电流体动力学研究的重要内容,采用相场(phase-field)法,将电场与剪切场进行双向耦合,建立电场和剪切场协同作用下双液滴运动、聚结数值模型,采用微观实验对数值模型的准确性进行验证,研究双液滴的运动、聚结规律及毛细数、电毛细数、剪切强度和液滴粒径等因素对双液滴聚结速率的影响。研究结果表明,电场和剪切场协同作用下双液滴的动态行为分为不聚结、聚结和聚结后破裂3种类型;电场和剪切场协同作用比单一场作用下的聚结效率提高63% ~94% ;毛细数、电毛细数及雷诺数对双液滴聚结时间的影响规律较好地符合Holliday函数,一定范围内三者的增大均能明显提高双液滴聚结效率。本研究为复杂湍流场中液滴的电聚结和新型静电聚结设备的优化提供了理论基础。

关键词: 液滴, 相场法, 电场, 剪切场, 聚结

Abstract:

Studies on electrohydrodynamics mainly focus on the liquid droplets in electrostatic coalescence equipment. In the present study, the electric field and shearing field is bi-directionally coupled using phase-field method; a numerical simulation model is established for double-droplets movement and coalescence under the synergistic effects of two fields; and the accuracy of this model is verified by microscopic experiments. Further, this study explores the impact of the law of double-droplets movement and coalescence, as well as capillary number, electro-capillary number, shearing strength and droplet size on the coalescence rate. The results indicate that under the synergistic effects of electric field and shearing filed, the dynamic behaviors of double-droplets can be divided into three types, i.e., non-coalescence, coalescence and break-up after coalescence. The coalescence efficiency in the coupling field can be improved by 63% ~94%, as compared with that in a single field. The influence of three factors including capillary number, electro-capillary number and Reynolds number on double-droplets coalescence time fits well with the Holliday function, and the coalescence rate can be significantly enhanced with the three factors increasing within a certain range. This study will provide a theoretical base for exploring the electro-coalescence of droplets in a complex turbulent flow field and optimizing the novel electrostatic coalescence equipment.

Key words: liquid droplet, phase-field method, electric field, shearing field, coalescence

中图分类号:

TE866

吕宇玲, 田成坤, 何利民, 张倩, 王朝霞. 电场和剪切场耦合作用下双液滴聚结数值模拟[J]. 石油学报, 2015, 36(2): 238-245.

Lü Yuling, Tian Chengkun, He Limin, Zhang Qian, Wang Zhaoxia. Numerical simulations on the double-droplets coalescence under the coupling effects of electric field and shearing field[J]. Acta Petrolei Sinica, 2015, 36(2): 238-245.

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电场和剪切场耦合作用下双液滴聚结数值模拟

Numerical simulations on the double-droplets coalescence under the coupling effects of electric field and shearing field

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