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Spreading of complex fluids with a soft blade

Marion Krapez1, Anaïs Gauthier1, Jean-Baptiste Boitte2, Odile Aubrun2, Jean-François Joanny3,4, and Annie Colin1

  • 1MIE–Chemistry, Biology and Innovation (CBI) UMR8231, ESPCI Paris, CNRS, PSL Research University, 75794 Paris, France
  • 2Centre de recherche de l'Oréal, 94550 Chevilly-Larue, France
  • 3Physico Chimie Curie, Institut Curie, PSL University, 75005 Paris, France
  • 4Collège de France, 75005 Paris, France

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Phys. Rev. Fluids 7, 084002 – Published 18 August, 2022

DOI: https://doi.org/10.1103/PhysRevFluids.7.084002

Abstract

The spreading of complex fluids is not only a part of our everyday life but also a central process in industry to produce functional thin films or protective coatings. Here we consider the spreading of polymer solutions with an elastic blade that deforms during the coating (similarly to a brush or a finger). By using complex fluids with well-chosen rheological properties, we disentangle the effects of shear viscosity, shear thinning, and normal stresses. We reveal two counterintuitive results: First, the mechanical work needed to spread a given volume of a shear-thinning fluid is higher than for the same volume of an equivalent Newtonian fluid at constant spreading velocity. Second, the first normal stress difference, which usually leads to remarkable behaviors such as the swelling of jets or the rise of the fluid on a rotating rod, has strikingly negligible effect here.

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Phys. Rev. Fluids 7, 084002– Published 18 August, 2022
  • Received 15 December 2021
  • Accepted 8 August 2022
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