Head-on collision of Newtonian drops in a viscoelastic medium
Head-on collision of Newtonian drops in a viscoelastic medium
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粘弹性介质中牛顿液滴的正面碰撞
DOI：
10.1007/s10404-019-2254-6
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发表时间：
2019
影响因子：
2.8
通讯作者：
P. Anderson
中科院分区：
文献类型：
--
作者：
C. Mitrias;N. Jaensson;M. Hulsen;P. Anderson
根据不同的应用，需要稳定或破坏乳液的界面特性。一般来说，控制乳剂稳定性的动力学的一个方面是当两个液滴碰撞时形成的膜的排水时间。在这项工作中，我们研究了在应用宏观拉伸速率下，基质流体的粘弹性对两个牛顿液滴进行正面碰撞的排水时间的影响。对于粘弹性基体材料的建模，选择了Giesekus模型。采用施加轴对称的柱面坐标系，采用有限元离散法进行全分辨数值模拟，求解得到的方程。研究结果表明，粘弹性降低了泄油时间，这是三个不同阶段的综合作用。
Depending on the application, one needs to either stabilize or destabilize the interfacial properties of an emulsion. An aspect of the dynamics that governs the stability of emulsions in general is the drainage time of the film that is formed when two drops collide. In this work, we study the effect that viscoelasticity of the matrix fluid has on this drainage time of two Newtonian drops that perform a head-on collision under an applied macroscopic extensional rate. For the modeling of the viscoelastic matrix material, the Giesekus model is chosen. A cylindrical coordinate system is applied with imposed axisymmetry and the resulting equations are solved using fully resolved numerical simulations employing a finite element discretization. Our results show that viscoelasticity reduces the drainage time, which is a combined effect of three different stages.
DOI：
10.1002/nme.2579
发表时间：
2009-09-10
影响因子：
2.9
作者：
Geuzaine, Christophe;Remacle, Jean-Francois
通讯作者：
Remacle, Jean-Francois