摘要
基于VOF液/液相界面追踪方法,建立了不可压缩水/油单乳液液滴动力学模型并进行数值求解,模拟研究了剪切流场条件下2个相同体积的液滴在碰撞过程中的相互作用及变形行为.观察了液滴碰撞过程中液滴的运动轨迹,并对相应的内在机理进行了分析.在剪切流场作用下,两液滴的碰撞过程分为接近、碰撞、分离3个阶段.由于碰撞过程中液滴间的相互挤推作用,液滴分离后,液滴间的侧向质心间距Δy/a增大.此外,分析了液滴碰撞过程中毛细数对液滴间相互作用的影响.两液滴在碰撞靠近过程中,在碰撞区中心处产生一个高压区,随着毛细数Ca从0.2增加到0.4,界面挤压变形越明显,液滴变形系数D也从0.32增加到0.51.
Based on VOF（ volume of fluid） liquid-liquid interface tracking method,a model for incompressible water-oil emulsion drop hydrodynamics is developed and numerically solved to study the hydrodynamic interaction and deformation behavior betw een tw o equal-sized drops during the collision in a shear flow. The motion trajectory during the collision is observed and the corresponding underlying hydrodynamics are analyzed. Under the shear flow,drop behavior during the collision can be divided into three stages： approach,collision and separation. Due to the hydrodynamic interaction betw een the drops,the final lateral separation of drop mass centers Δy / a increases after the drop separation. In addition,the effects of the capillary number on the hydrodynamic interaction betw een tw o interactive drops are also analyzed. During the collision,a high pressure region is observed at the center of the flow domain. As the capillary number increases from 0. 2 to 0. 4,the interface deformation is more obvious and the deformation coefficient D of the drop increases from0. 32 to 0. 51.
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2015年第2期309-313,共5页
Journal of Southeast University：Natural Science Edition
基金
江苏省自然科学基金资助项目(BK20130009,BK20130621)
中国工程物理研究院科学技术发展基金资助项目(2012A0302015)
关键词
液滴
碰撞
剪切流场
VOF方法
drop
collision
shear flow
volume of fluid method
