电场作用下微液滴变形和破裂的数值研究
发布时间：2019-01-05 09:51
【摘要】：采用电场对微液滴进行精确操控在化工、生物医学、能源和环境领域具有广阔的应用前景。准确预测外加电场作用下黏性液滴的变形与破裂行为,是精确操控微液滴行为的重要前提。本文基于漏电介质模型发展格子Boltzmann有限差分混合数值方法对恒稳电场作用下的液滴变形与破裂行为进行研究,结果表明:本文数值方法可对恒稳电场作用下液滴的小变形进行准确预测,验证了该模型的有效性和准确性;对于沿垂直于电场方向变形的液滴(扁平型),液滴随电场毛细数的增加呈现四种不同的形态:椭圆形、类椭圆形、哑铃型和破裂;对于沿电场方向变形的液滴(扁长型),其变形参数随电场毛细数的变化与扁平型液滴显著不同,液滴呈现的形态包括椭圆形、类椭圆形、周期振荡和破裂。在液滴变形阶段,扁平或扁长型液滴均随电场毛细数的增加而变形增大;液滴破裂阶段,破裂所需时间均随电场毛细数的增加而缩短。研究工作为深刻认识电场作用下微液滴变形和破裂机制提供理论基础。
[Abstract]:The accurate manipulation of microdroplets by electric field has broad application prospects in chemical, biomedical, energy and environmental fields. It is an important prerequisite to accurately control the behavior of microdroplets to predict the deformation and rupture behavior of viscous droplets under the action of external electric field. Based on the leakage medium model, the lattice Boltzmann finite difference mixed numerical method is used to study the droplet deformation and fracture behavior under the constant stable electric field. The results show that the numerical method in this paper can accurately predict the small deformation of droplets under the action of constant stable electric field, and verify the validity and accuracy of the model. For the droplets (flat type) deformed perpendicular to the electric field, the droplets show four different shapes with the increase of the electric field capillary number: ellipsoid, dumbbell and rupture; For droplets (flat and long) deformed along the direction of electric field, the variation of deformation parameters with the number of electric field capillary is obviously different from that of flat droplets. The shape of droplets includes ellipsoid, periodic oscillation and rupture. In droplet deformation stage, both flat and long droplets deform and increase with the increase of electric field capillary number, while in droplet rupture stage, the rupture time is shortened with the increase of electric field capillary number. The research provides a theoretical basis for understanding the deformation and fracture mechanism of microdroplets under the action of electric field.
【作者单位】： 西安交通大学能源与动力工程学院;
【基金】：国家自然科学基金资助项目(No.51506168,No.51711530130) 国家重点研发计划(No.2016YFB0200902) 中组部“千人计划”青年人才项目
【分类号】：O35
[Abstract]:The accurate manipulation of microdroplets by electric field has broad application prospects in chemical, biomedical, energy and environmental fields. It is an important prerequisite to accurately control the behavior of microdroplets to predict the deformation and rupture behavior of viscous droplets under the action of external electric field. Based on the leakage medium model, the lattice Boltzmann finite difference mixed numerical method is used to study the droplet deformation and fracture behavior under the constant stable electric field. The results show that the numerical method in this paper can accurately predict the small deformation of droplets under the action of constant stable electric field, and verify the validity and accuracy of the model. For the droplets (flat type) deformed perpendicular to the electric field, the droplets show four different shapes with the increase of the electric field capillary number: ellipsoid, dumbbell and rupture; For droplets (flat and long) deformed along the direction of electric field, the variation of deformation parameters with the number of electric field capillary is obviously different from that of flat droplets. The shape of droplets includes ellipsoid, periodic oscillation and rupture. In droplet deformation stage, both flat and long droplets deform and increase with the increase of electric field capillary number, while in droplet rupture stage, the rupture time is shortened with the increase of electric field capillary number. The research provides a theoretical basis for understanding the deformation and fracture mechanism of microdroplets under the action of electric field.
【作者单位】： 西安交通大学能源与动力工程学院;
【基金】：国家自然科学基金资助项目(No.51506168,No.51711530130) 国家重点研发计划(No.2016YFB0200902) 中组部“千人计划”青年人才项目
【分类号】：O35
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