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Luu LH, Philippe P, Chambon G. Experimental study of the solid-liquid interface in a yield-stress fluid flow upstream of a step. Phys Rev E Stat Nonlin Soft Matter Phys. 2015;91(1):013013doi: 10.1103/PhysRevE.91.013013.
Luu, L. H., Philippe, P., & Chambon, G. (2015). Experimental study of the solid-liquid interface in a yield-stress fluid flow upstream of a step. Physical review. E, Statistical, nonlinear, and soft matter physics, 91(1), 013013. https://doi.org/10.1103/PhysRevE.91.013013
Luu, Li-Hua, et al. "Experimental study of the solid-liquid interface in a yield-stress fluid flow upstream of a step." Physical review. E, Statistical, nonlinear, and soft matter physics vol. 91,1 (2015): 013013. doi: https://doi.org/10.1103/PhysRevE.91.013013
Luu LH, Philippe P, Chambon G. Experimental study of the solid-liquid interface in a yield-stress fluid flow upstream of a step. Phys Rev E Stat Nonlin Soft Matter Phys. 2015 Jan;91(1):013013. doi: 10.1103/PhysRevE.91.013013. Epub 2015 Jan 30. PMID: 25679714.
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Phys Rev E Stat Nonlin Soft Matter Phys. 2015 Jan;91(1):013013. doi: 10.1103/PhysRevE.91.013013. Epub 2015 Jan 30.

Experimental study of the solid-liquid interface in a yield-stress fluid flow upstream of a step.

Physical review. E, Statistical, nonlinear, and soft matter physics

Li-Hua Luu, Pierre Philippe, Guillaume Chambon

Affiliations

  1. IRSTEA, UR OHAX, 3275 route de Cézanne, 13182 Aix-en-Provence, France.
  2. IRSTEA, UR ETGR, Domaine Universitaire, BP 76, 38402 St-Martin-d'Hère, France and Université Grenoble Alpes, 38402 St-Martin-d'Hère, France.

PMID: 25679714 DOI: 10.1103/PhysRevE.91.013013

Abstract

We present an experimental study investigating the transition zone between a liquid-like unyielded region and a solid-like yielded region in a yield-stress fluid. The configuration consists of a rectangular closed-channel flow disturbed by the presence of a step. Upstream of the step, a solid-liquid interface between a dead zone and a flow zone appears. In this study, we use a model fluid, namely polymer micro-gel Carbopol, which exhibits Herschel-Bulkley viscoplastic rheology. Exploiting the fluid transparency, the flow is monitored by particle image velocimetry using an internal visualization technique. The main outcome of this study is to show that, except in a thin transition layer close to the solid-liquid interface, the flow behaves as an apparent Poiseuille flow with an apparent slip condition at the base. The slip frontier is found to be almost independent of the flow rate while the corresponding slip velocity increases with the flow rate.

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