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.

*This work was supported by the Laboratory Basic Sciences (LBS) program administered by the University of Rochester Laboratory for Laser Energetics for DOE/NNSA. This work was performed under the auspices of the U S Department of Energy under Grant DE SC 0019329 within the joint HEDLP program. 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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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.