4.2 Article Proceedings Paper

Break-up of a Newtonian drop in a viscoelastic matrix under simple shear flow

期刊

RHEOLOGICA ACTA
卷 43, 期 5, 页码 449-456

出版社

SPRINGER
DOI: 10.1007/s00397-004-0374-7

关键词

drop break up; Boger fluid; viscoelasticity; shear flow; optical microscopy

向作者/读者索取更多资源

The effect of matrix elasticity on the break-up of an isolated Newtonian drop under step shear flow is herein presented. Constant-viscosity, elastic polymer solutions (Boger fluids) were used as matrix phase. Newtonian silicon oils were used as drop phase. Three viscosity ratios were explored (drop/matrix), i.e. 2, 0.6 and 0.04. Following the theoretical analysis of Greco [Greco F (2002) J Non-Newtonian Fluid Mech 107:111-131], the role of elasticity on drop fluid dynamics was quantified according to the value of the parameter p=tau/tau(em), where tau is a constitutive relaxation time of the matrix fluid and tau(em) is the emulsion time. Different fluids were prepared in order to have p ranging from 0.1 to 10. At all the viscosity ratios explored, break-up was hindered by matrix elasticity. The start-up transient of drop deformation, at high, but sub-critical capillary numbers, showed an overshoot, during which the drop enhanced its orientation toward the flow direction. Both phenomena increase if the p parameter increases. Finally, the non-dimensional pinch-off length and break-up time were also found to increase with p.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.2
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据