Oscillatory settling in wormlike-micelle solutions: Bursts and a long time scale

Nitin Kumar; Sayantan Majumdar; Aditya Sood; Rama Govindarajan; Sriram Ramaswamy; A. K. Sood

doi:10.1039/c2sm25077b

Oscillatory settling in wormlike-micelle solutions: Bursts and a long time scale

Nitin Kumar, Sayantan Majumdar, Aditya Sood, Rama Govindarajan, Sriram Ramaswamy, A. K. Sood

Research output: Contribution to journal › Article › peer-review

21 Scopus citations

Abstract

We study the dynamics of a spherical steel ball falling freely through a solution of entangled wormlike-micelles. If the sphere diameter is larger than a threshold value, the settling velocity shows repeated short oscillatory bursts separated by long periods of relative quiescence. We propose a model incorporating the interplay of settling-induced flow, viscoelastic stress and, as in M. E. Cates, D. A. Head and A. Ajdari, Phys. Rev. E, 2002, 66, 025202(R) and A. Aradian and M. E. Cates, Phys. Rev. E, 2006, 73, 041508, a slow structural variable for which our experiments offer independent evidence.

Original language	English (US)
Pages (from-to)	4310-4313
Number of pages	4
Journal	Soft matter
Volume	8
Issue number	16
DOIs	https://doi.org/10.1039/c2sm25077b
State	Published - Apr 28 2012
Externally published	Yes

All Science Journal Classification (ASJC) codes

General Chemistry
Condensed Matter Physics

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abstract = "We study the dynamics of a spherical steel ball falling freely through a solution of entangled wormlike-micelles. If the sphere diameter is larger than a threshold value, the settling velocity shows repeated short oscillatory bursts separated by long periods of relative quiescence. We propose a model incorporating the interplay of settling-induced flow, viscoelastic stress and, as in M. E. Cates, D. A. Head and A. Ajdari, Phys. Rev. E, 2002, 66, 025202(R) and A. Aradian and M. E. Cates, Phys. Rev. E, 2006, 73, 041508, a slow structural variable for which our experiments offer independent evidence.",

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AU - Kumar, Nitin

AU - Majumdar, Sayantan

AU - Sood, Aditya

AU - Govindarajan, Rama

AU - Ramaswamy, Sriram

AU - Sood, A. K.

PY - 2012/4/28

Y1 - 2012/4/28

N2 - We study the dynamics of a spherical steel ball falling freely through a solution of entangled wormlike-micelles. If the sphere diameter is larger than a threshold value, the settling velocity shows repeated short oscillatory bursts separated by long periods of relative quiescence. We propose a model incorporating the interplay of settling-induced flow, viscoelastic stress and, as in M. E. Cates, D. A. Head and A. Ajdari, Phys. Rev. E, 2002, 66, 025202(R) and A. Aradian and M. E. Cates, Phys. Rev. E, 2006, 73, 041508, a slow structural variable for which our experiments offer independent evidence.

AB - We study the dynamics of a spherical steel ball falling freely through a solution of entangled wormlike-micelles. If the sphere diameter is larger than a threshold value, the settling velocity shows repeated short oscillatory bursts separated by long periods of relative quiescence. We propose a model incorporating the interplay of settling-induced flow, viscoelastic stress and, as in M. E. Cates, D. A. Head and A. Ajdari, Phys. Rev. E, 2002, 66, 025202(R) and A. Aradian and M. E. Cates, Phys. Rev. E, 2006, 73, 041508, a slow structural variable for which our experiments offer independent evidence.

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Oscillatory settling in wormlike-micelle solutions: Bursts and a long time scale

Abstract

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