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    Volume 43, Issue 1 (January 2015)

    Viscous Fingering in LAPONITE® and Mud

    (Received 4 April 2013; accepted 10 February 2014)

    Published Online: 2015

    CODEN: JTEVAB

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    Abstract

    We have studied the Saffman–Taylor instability for LAPONITE® and mud in a rectangular Hele–Shaw cell. The experiments showed several fingering patterns that did not obey the classical theory of Saffman–Taylor instability. LAPONITE® fingers at high and low shear rates showed shear thinning and shear thickening behavior, respectively. This result is in agreement with rheological analyses. The results of both rheology and Hele–Shaw experiments show a diversion point in the shear viscosity diagram at a specific shear rate. The generalized Darcy’s law for shear thinning fluid in which the viscosity is a function of shear rate can be used to measure viscosity. The validity of this approach was tested using three Newtonian fluids (detergent, oil, and clothing conditioner) and one non-Newtonian fluid (LAPONITE®). These analyses on LAPONITE® as a non-Newtonian fluid verified that the generalized Darcy’s law is in good agreement with rheological analysis in the shear thinning region. In contrast, the mud suspension showed Newtonian behavior at all pressure gradients.


    Author Information:

    Maleki-Jirsaraei, N.
    Complex Systems Lab, Physics Dept., Alzahra Univ., Tehran,

    Erfani, M.
    Complex Systems Lab, Physics Dept., Alzahra Univ., Tehran,

    Department of Physics, University of Siegen, Siegen,

    Ghane-Golmohamadi, F.
    Complex Systems Lab, Physics Dept., Alzahra Univ., Tehran,

    Physics Dept., Tarbiat Modares Univ., Tehran,

    Ghane-Motlagh, R.
    Complex Systems Lab, Physics Dept., Alzahra Univ., Tehran,


    Stock #: JTE20130079

    ISSN:0090-3973

    DOI: 10.1520/JTE20130079

    Author
    Title Viscous Fingering in LAPONITE® and Mud
    Symposium ,
    Committee E08