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Dynamic viscosity of shock-compressed hydrocarbons (CH)

ORAL · Invited

Abstract

The mixing and transport of fluids at high pressures and temperatures can be found in applications ranging from planetary interiors to inertial confinement fusion. However, despite the role that viscosity has on the formation and growth of hydrodynamic instabilities and turbulence, experimental measurements of viscosity of materials at high energy-density conditions are limited in parameter space, since few conventional viscometry techniques can be applied in this regime. Even at moderately high pressures, experimental viscosity values may disagree by several orders of magnitude. In this talk, we describe ongoing experimental and modeling campaigns at OMEGA and EP that use two different techniques to determine the dynamic viscosity of dynamically-compressed fluids, where viscous effects are expected to be felt at similar scales. In the first technique, we use x-ray radiography to measure the displacement of impulsively accelerated spheres in solid epoxy, and corroborate the particle trajectory with unsteady forcing models to obtain the epoxy's dynamic viscosity from viscous force contributions. In the second technique, viscosity will be deduced by measuring the decaying oscillations of a rippled shock front in polystyrene with VISAR. Determining the magnitude of viscosity will improve hydrodynamic modeling for these complex systems and guide the development of particle-based velocimetry.

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Publication: Nitish Acharya, Hussein Aluie, and Jessica Shang, "Numerical investigation of laser-driven shock interaction with a deformable particle", under review at Physics of Plasmas.

Presenters

  • Jessica Shang

    University of Rochester

Authors

  • Jessica Shang

    University of Rochester

  • Danae Polsin

    Laboratory for Laser Energetics, Department of Mechanical Engineering, University of Rochester, Rochester, NY, USA. Laboratory for Laser Energetics, Rochester, NY, USA.

  • Nitish Acharya

    Department of Mechanical Engineering, University of Rochester, Rochester, NY, USA, University of Rochester

  • Afreen Syeda

    Department of Mechanical Engineering, University of Rochester, Rochester, NY, USA, University of Rochester

  • Hussein Aluie

    Department of Mechanical Engineering, University of Rochester, Rochester, NY, USA. Laboratory for Laser Energetics, Rochester, NY, USA., University of Rochester

  • Riccardo Betti

    Department of Mechanical Engineering, University of Rochester, Rochester, NY, USA. Laboratory for Laser Energetics Rochester, NY, USA. Department of Physics and Astronomy,, University of Rochester

  • Peter M Celliers

    Lawrence Livermore Natl Lab

  • Gilbert W Collins

    University of Rochester, Department of Mechanical Engineering, University of Rochester, Rochester, NY, USA. Laboratory for Laser Energetics, Rochester, NY, USA. Department of Physics and Astronomy,

  • Arianna Gleason

    SLAC - Natl Accelerator Lab, SLAC National Accelerator Laboratory, CA, USA. Geological Sciences Department, Stanford University, CA, USA.

  • Heather M Pantell

    University of Rochester

  • J. Ryan Rygg

    University of Rochester