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

Li-Hua Luu, Pierre Philippe, and Guillaume Chambon
Phys. Rev. E 91, 013013 – Published 30 January 2015

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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  • Received 20 June 2014
  • Revised 14 October 2014

DOI:https://doi.org/10.1103/PhysRevE.91.013013

©2015 American Physical Society

Authors & Affiliations

Li-Hua Luu* and Pierre Philippe

  • IRSTEA, UR OHAX, 3275 route de Cézanne, 13182 Aix-en-Provence, France

Guillaume Chambon

  • IRSTEA, UR ETGR, Domaine Universitaire, BP 76, 38402 St-Martin-d'Hère, France and Université Grenoble Alpes, 38402 St-Martin-d'Hère, France

  • *li-hua.luu@irstea.fr

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Issue

Vol. 91, Iss. 1 — January 2015

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