Bulletin of the American Physical Society
21st Biennial Conference of the APS Topical Group on Shock Compression of Condensed Matter
Volume 64, Number 8
Sunday–Friday, June 16–21, 2019; Portland, Oregon
Session D4: MS: Water |
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Chair: Yingwei Fei, Carnegie Institution for Science Room: Pavilion West |
Monday, June 17, 2019 2:00PM - 2:15PM |
D4.00001: Probing the Metastability Limit of Liquid Water under Dynamic Compression Michelle Marshall, Marius Millot, Dayne Fratanduono, Philip Myint, Jon Belof, Ray Smith, James McNaney Kinetics can play an important role in the transformation of materials to different high-pressure phases on the short time scales associated with dynamic-compression experiments. The study of phase-transition kinetics has motivated many theoretical and experimental works on the rapid freezing of water into the ice VII phase. We present measurements of the over-pressurization of the water-ice VII phase transition at 10$\times$ higher strain rates than previously studied. Water was ramp compressed to peak pressures of $\sim$15 GPa over $\sim$10 ns using a laser-driven release reservoir technique at the Omega Laser Facility. The stress at which water froze into the ice VII phase is deduced from wave-profile measurements and compared to predictions using a phase-transition-kinetics model recently developed at Lawrence Livermore National Laboratory. [Preview Abstract] |
Monday, June 17, 2019 2:15PM - 2:30PM |
D4.00002: Using THOR to manipulate the homogeneous phase transition and nucleation rates in freezing water Erin Nissen, Daniel Dolan Water undergoes a rapid, first-order phase transition under quasi-isentropic compression to form polycrystalline ice VII. Prior research on this topic has focused on probing the kinetics of solidification by concentrating on two factors: peak pressure, and window material. Less attention has focused on the effects of (1) elevated initial temperature, which forces the kinetics to follow a different isentropic loading path and (2) the variation in ramp rate, reported in this study. Dynamic freezing in water was found to be affected by both conditions. Increasing the initial sample temperature pushed the metastable transition limit to higher pressures, while slower compression lead to slower nucleation rates. Sandia National Labs is managed and operated by National Technology {\&} Engineering Solutions of Sandia, LLC, a subsidiary of Honeywell International, Inc., for the U.S Dept. of Energy's National Nuclear Security Administration under contract DE-NA0003525. [Preview Abstract] |
Monday, June 17, 2019 2:30PM - 2:45PM |
D4.00003: Study of shock growth of ice VI single crystal near equilibrium melting pressure with dynamic diamond anvil cell Yong-Jae Kim, Yun-Hee Lee, Sooheyong Lee, Hiroki Nada, Geun Woo Lee Crystal growth under local non-equilibrium condition shows diverse growth morphologies and mechanisms. To reveal the origin of the diverse growth behavior, we systematically control the growth condition from local equilibrium to local non-equilibrium by increasing compression rate from \textasciitilde 10$^{\mathrm{-3}}$ /s to \textasciitilde 1 /s with an advanced dynamic diamond anvil cell (dDAC). We find anomalously fast growth, or shock crystal growth, of ice VI single crystal with a morphological transition from three- to two-dimension (3-d to 2-d) under rapid compression of \textgreater \textasciitilde 0.1 /s. Unlike expectation, the shock growth occurs from the edges of three-dimensional seed crystal rather than its corners. Despite of small average supercompression of \textless \textasciitilde 0.06 GPa, the fast compression yields effectively large overpressure at the crystal-liquid interface, manifesting the local non-equilibrium condition to initiate shock growth. Molecular dynamics (MD) simulation reproduces the faster growth of the shock growth plane upon applying large overpressure and reveals the similarity of the interface structure between water and the shock growth crystal plane. *Part of this work performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. LLNL-ABS-768460. [Preview Abstract] |
Monday, June 17, 2019 2:45PM - 3:00PM |
D4.00004: Comparing different water equations of state for aquarium tests Eduardo Lozano, Tariq Aslam, Vilem Petr, Gregory S. Jackson The aquarium test provides optical data on important aspects of the detonation performance, namely the detonation velocity, shock wave shape in the surrounding water, and expansion rate of the condensed phase explosive products. It is commonly used for calibrating reaction rate laws and products equations of state (EOS). An important aspect, with regards to the analysis, is an adequate representation of the confining material to avoid inaccuracies. We conduct a series of two-dimensional axisymmetric reactive flow simulations for an ANFO-PMMA-water system using the Ghost Fluid Method. The goal is to evaluate the results obtained using three different EOSs for water: Tait, Murnaghan, and Tillotson. The numerical calculations are compared to large-scale aquarium experiments where the HE-water interface and the water shock front locations are directly measured from time-resolved image data. [Preview Abstract] |
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