Volume 104, Number 2, October 2013
|Number of page(s)||6|
|Section||Interdisciplinary Physics and Related Areas of Science and Technology|
|Published online||18 November 2013|
Experimental observation of shear thickening oscillation
1 Department of Mechanical Engineering, Sendai National College of Technology - Natori, Miyagi 981-1239, Japan
2 Department of Physics, Kyushu University - 33, Fukuoka 812-8581, Japan
3 Niels Bohr Institute, University of Copenhagen - Blegdamsvej 17, DK-2100, Copenhagen Ø, Denmark
Received: 1 July 2013
Accepted: 20 October 2013
We report experimental observations of the shear thickening oscillation, i.e. the spontaneous macroscopic oscillation in the shear flow of severe shear thickening fluid. Using a density-matched starch-water mixture, in the cylindrical shear flow of a few centimeters flow width, we observed that well-marked vibrations of frequency around 20 Hz appear via a Hopf bifurcation upon increasing externally applied shear stress. The parameter range and the frequency of the vibration are consistent with those expected by a simple phenomenological model of the dilatant fluid.
PACS: 83.80.Hj – Suspensions, dispersions, pastes, slurries, colloids / 83.60.Rs – Shear rate-dependent structure (shear thinning and shear thickening) / 83.60.Wc – Flow instabilities
© EPLA, 2013
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