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Viscous Effects in Shock-Particle Interaction

ORAL

Abstract

Viscosity gives insight into the momentum transport in a system and plays a crucial role in mixing and growth of hydrodynamic instabilities. Viscosity measurements in High Energy Density (HED) states are particularly important to accurately develop hydrodynamic models and to bridge the gap between simulations and experimental results of complex systems such as Inertial Confinement Fusion. We measured viscosity in dynamically compressed epoxy (CH, 1.1 g/cc) by tracing the acceleration of particles embedded in the target. The OMEGA-60 laser facility was used to generate laser beams to drive a shock (⁓240 GPa) through the CH target, which was embedded with 40 and 60 μm stainless steel spherical particles (7.8 g/cc) that would be accelerated by the flow behind the shock. The particle positions were recorded with time-resolved X-ray radiography. The shock speed was measured using VISAR and the velocity of CH was calculated from this data. The velocities of the particles and CH were used to determine the viscous and inviscid force contributions acting on the particles using a shock-particle forcing model. From the viscous unsteady force, we determined the dynamic viscosity of shock compressed CH to be ranging from 0 to 100 Pa.sec.

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Presenters

  • Afreen Syeda

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

Authors

  • Afreen Syeda

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

  • Jessica Shang

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

  • Hussein Aluie

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

  • Nitish Acharya

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

  • Arianna Gleason

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

  • Danae Polsin

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

  • 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

  • Ryan Rygg

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

  • 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,

  • John J Ruby

    Lawrence Livermore National Lab, Lawrence Livermore National Laboratory, CA, USA., Lawrence Livermore National Laboratory

  • Hadley Pantell

    Department of Physics and Astronomy, University of Rochester, Rochester, NY, USA.

  • Alex Chin

    Department of Physics and Astronomy, University of Rochester, Rochester, NY, USA.