Deformation and buckling of microcapsules in a viscoelastic matrix.
Deformation and buckling of microcapsules in a viscoelastic matrix.
复制标题
粘弹性基质中微胶囊的变形和屈曲。
作者：
A. Raffiee;S. Dabiri;A. Ardekani
本文用前沿跟踪法数值研究了线性剪切流中（1）粘弹性基质中的牛顿液体胶囊和（2）牛顿基质中的粘弹性胶囊的动力学行为。情况（1）的数值结果表明，聚合物流体减少了胶囊变形，并使变形的胶囊与流动方向对齐。它还缩小了情况（1）中变形胶囊所经历的张力范围，而坦克踩踏时间显著增加。有趣的是，聚合物流体对情况（2）的坦克踩踏周期和取向角具有相反的影响，但其对变形的影响与情况（1）相似。
In this paper, we numerically study the dynamics of (1) a Newtonian liquid-filled capsule in a viscoelastic matrix and that of (2) a viscoelastic capsule in a Newtonian matrix in a linear shear flow using a front-tracking method. The numerical results for case (1) indicate that the polymeric fluid reduces the capsule deformation and aligns the deformed capsule with the flow direction. It also narrows the range of tension experienced by the deformed capsule for case (1), while the tank-treading period significantly increases. Interestingly, the polymeric fluid has an opposite effect on the tank-treading period and the orientation angle of case (2), but its effect on the deformation is similar to case (1).