Viscosity measurements of shock-compressed Epoxy

POSTER

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 Stylist 1266 (CH, 1.1 g/cc) by tracing the acceleration of particles embedded in the target. The OMEGA-60 laser facility was used 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 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 forces, we calculated the dynamic viscosity of CH to be less than 10 Pa-sec . A Bayesian inference analysis on the force model was performed to determine the probability distribution of viscosity for a given range of input variables.

*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. This work was supported by US DOE and NNSA under the joint HEDLP program under grant DE-SC0019329 and DE-NA0004134. Partial support from grants NSF PHY-2020249, DE-SC0020229 and DE-NA0003914 is also acknowledged.

Presenters

  • Afreen Syeda

    • University of Rochester

Authors

  • Afreen Syeda

    • University of Rochester

  • Nitish Acharya

    • University of Rochester

  • Anjeli Estrada Alvarez

    • Department of Mechanical Engineering, University of Rochester

  • Arianna E Gleason

    • SLAC - Natl Accelerator Lab

  • Danae Polsin

    • Laboratory for Laser Energetics

  • James Ryan Rygg

    • Dept. of Mechanical Engg, Dept. of Physics and Astronomy, University of Rochester. Laboratory for Laser Energy, Rochester, NY, USA.

  • Gilbert W Collins

    • University of Rochester

  • John J Ruby

    • Lawrence Livermore National Laboratory

  • David Chin

    • Dept. of Physics and Astronomy, University of Rochester

  • Riccardo Betti

    • Dept. of Mechanical Engg, Dept. of Physics and Astronomy, University of Rochester. Laboratory for Laser Energy, Rochester, NY, USA.

  • Hadley Pantell

    • Department of Physics and Astronomy, University of Rochester

  • Jessica Shang

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

  • Hussein Aluie

    • Dept. of Mechanical Engg, University of Rochester. Laboratory for Laser Energetics, Rochester, NY, USA.