TY - JOUR
T1 - Oscillatory settling in wormlike-micelle solutions
T2 - Bursts and a long time scale
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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U2 - 10.1039/c2sm25077b
DO - 10.1039/c2sm25077b
M3 - Article
AN - SCOPUS:84859305671
SN - 1744-683X
VL - 8
SP - 4310
EP - 4313
JO - Soft matter
JF - Soft matter
IS - 16
ER -