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Growth of viscoelastic wings and the reduction of particle mobility in a viscoelastic shear flow

William L. Murch1,*, Sreenath Krishnan2, Eric S. G. Shaqfeh1,2,3,†, and Gianluca Iaccarino2,3

  • 1Department of Chemical Engineering, Stanford University, Stanford, California 94305, USA
  • 2Department of Mechanical Engineering, Stanford University, Stanford, California 94305, USA
  • 3Institute for Computational and Mathematical Engineering, Stanford University, Stanford, California 94305, USA

  • *murch@stanford.edu
  • †esgs@stanford.edu
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Phys. Rev. Fluids 2, 103302 – Published 25 October, 2017

DOI: https://doi.org/10.1103/PhysRevFluids.2.103302

Abstract

The motion of a rigid spherical particle in a sheared polymeric fluid is studied via experiments and numerical simulations. We study particle mobility in highly elastic fluids, where the deformation due to the sphere's movement and the shear flow both result in significant stretching of the polymer. The shear flow is imposed in a plane perpendicular to the sphere's movement, resulting in regions of high polymer tension in the wake of the sphere that can extend well into the shear flow and gradient directions. We observe that these viscoelastic wake structures, resembling wings, are linked to an increase in the form drag, providing a mechanism for a dramatic decrease in the particle mobility.

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Outline

Information

Phys. Rev. Fluids 2, 103302– Published 25 October, 2017
  • Received 29 January 2017
  • Revised 15 July 2017
Article part of CHORUS

©2017 American Physical Society

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