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.

*This work was performed under the auspices of the U.S. Department of Energy under Grant DE-SC0019329 within the joint HEDLP program, the NNSA Stewardship Alliances Program under Grant DE-NA0003914, and the National Science Foundation under Grant PHY-2020249. The experiment was conducted at the Omega Laser Facility at the University of Rochester's Laboratory for Laser Energetics with the beam time through the Laboratory Basic Sciences (LBS) program.

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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