Volume 107, Number 5, September 2014
|Number of page(s)||6|
|Section||Interdisciplinary Physics and Related Areas of Science and Technology|
|Published online||29 August 2014|
Capillary rise of yield-stress fluids
1 Institut Lumière Matière, UMR5306 CNRS, Université Claude Bernard Lyon 1 - 10 rue Ada Byron, F-69622 Villeurbanne Cedex, France
2 Surface du verre et interfaces, UMR 125 CNRS/Saint-Gobain - 39 quai Lucien Lefranc, F-93303 Aubervilliers Cedex, France
3 Institut Universitaire de France - Paris, France
Received: 20 July 2014
Accepted: 5 August 2014
In this letter the capillary rise of yield-stress fluids is investigated experimentally. Contrary to the case of simple fluids, the final height reached by yield-stress fluids weakly depends on the gap and is strongly affected by the yield stress and the hydrodynamic boundary conditions. Such dependences suggest that the capillary rise of yield-stress fluids results from a dynamical arrest rather than from a thermodynamic equilibrium. To rationalize these results, we propose and validate an extension of Jurin's law to such complex systems. Finally we show that measuring the final height allows for the determination of both the surface tension and the yield stress.
PACS: 83.60.La – Viscoplasticity; yield stress / 68.08.Bc – Wetting / 83.50.Lh – Slip boundary effects (interfacial and free surface flows)
© EPLA, 2014
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