Impact dynamics of a solid sphere falling into a viscoelastic micellar fluid

被引：87

作者：

Akers, Benjamin ^{[1
]}

Belmonte, Andrew ^{[1
]}

机构：

[1] Penn State Univ, Dept Math, WG Pritchard Labs, University Pk, PA 16802 USA

来源：

JOURNAL OF NON-NEWTONIAN FLUID MECHANICS | 2006年 / 135卷 / 2-3期

基金：

美国国家科学基金会;

关键词：

impact; sedimentation; splashing; free surface flows; wormlike micelles; cavity pinch-off; fracture;

D O I：

10.1016/j.jnnfm.2006.01.004

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

We present an experimental study of the impact of a solid sphere on the free surface of a viscoelastic wormlike micellar fluid. Spheres of various densities and diameters are dropped from different heights above the fluid surface, reaching it with a nonzero velocity which determines the subsequent dynamics. Measurements of the initial sphere penetration are found to scale with the ratio of the kinetic energy of the sphere at impact to the elastic modulus of the fluid. The cavity formed in the wake of the sphere, observed with high-speed video imaging, also undergoes transitions from a smooth to fractured surface texture, dependent on both the Deborah number and the ratio of the gravitational force to elasticity. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：97 / 108

页数：12

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