Discontinuous shear thickening in Brownian suspensions by dynamic simulation

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  • Romain Mari
    Benjamin Levich Institute, The City College of New York, New York, NY 10031;
  • Ryohei Seto
    Benjamin Levich Institute, The City College of New York, New York, NY 10031;
  • Jeffrey F. Morris
    Benjamin Levich Institute, The City College of New York, New York, NY 10031;
  • Morton M. Denn
    Benjamin Levich Institute, The City College of New York, New York, NY 10031;

Abstract

<jats:title>Significance</jats:title> <jats:p>Colloidal shear thickening is a phenomenon by which a dense mixture (or suspension) of sub–micrometer-sized particles in a fluid becomes more viscous when strained. It has important (mostly negative) consequences as dense suspensions are found in many industrial processes. Its origin is a long-standing unsolved problem in soft-matter physics. We perform dynamic simulations that show that the shear thickening may be explained as a stress-induced transition from a flow of lubricated near-contacting particles to a flow of a frictionally contacting network of particles. Our numerical data quantitatively match previous experimental data.</jats:p>

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