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Title: Ejecta transport, breakup and conversion

Abstract

Here, we report experimental results from an initial study of reactive and nonreactive metal fragments—ejecta—transporting in vacuum, and in reactive and nonreactive gases. We postulate that reactive metal fragments ejected into a reactive gas, such as H 2, will break up into smaller fragments in situations where they are otherwise hydrodynamically stable in a nonreactive gas such as He. To evaluate the hypothesis we machined periodic perturbations onto thin Ce and Zn coupons and then explosively shocked them to eject hot, micron-scale fragments from the perturbations. The ejecta masses were diagnosed with piezoelectric pressure transducers, and their transport in H 2 and He was imaged with visible and infrared (IR) cameras. Because Ce + H 2 → CeH 2 + ΔH, where ΔH is the enthalpy of formation, an observed increase of the relative IR (radiance) temperature TR between the Ce–H 2 and Ce–He gas systems can be used to estimate the amount of Ce that converts to CeH 2. As a result, the experiments sought to determine whether dynamic chemical effects should be included in ejecta-transport models.

Authors:
 [1];  [2]; ORCiD logo [1]; ORCiD logo [1];  [1];  [3];  [1];  [3];  [1];  [1];  [1]; ORCiD logo [1]; ORCiD logo [1];  [3];  [3];  [3]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Yale Univ., New Haven, CT (United States)
  3. National Securities Technologies, Santa Barbara, CA (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1358166
Report Number(s):
LA-UR-16-28075
Journal ID: ISSN 2199-7446
Grant/Contract Number:
AC52-06NA25396
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Dynamic Behavior of Materials
Additional Journal Information:
Journal Volume: 3; Journal Issue: 2; Journal ID: ISSN 2199-7446
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; ejecta; transport; multiphase flow

Citation Formats

Buttler, William Tillman, Lamoreaux, Steven Keith, Schulze, Roland K., Schwarzkopf, John Dennis, Cooley, Jason Christopher, Grover, Mike, Hammerberg, James Edward, La Lone, Brandon M., Llobet Megias, Anna, Manzanares, Ruben, Martinez, John Israel, Schmidt, Derek William, Sheppard, Daniel Glen, Stevens, Gerald D., Turley, William D., and Veeser, Lynn R. Ejecta transport, breakup and conversion. United States: N. p., 2017. Web. doi:10.1007/s40870-017-0114-6.
Buttler, William Tillman, Lamoreaux, Steven Keith, Schulze, Roland K., Schwarzkopf, John Dennis, Cooley, Jason Christopher, Grover, Mike, Hammerberg, James Edward, La Lone, Brandon M., Llobet Megias, Anna, Manzanares, Ruben, Martinez, John Israel, Schmidt, Derek William, Sheppard, Daniel Glen, Stevens, Gerald D., Turley, William D., & Veeser, Lynn R. Ejecta transport, breakup and conversion. United States. doi:10.1007/s40870-017-0114-6.
Buttler, William Tillman, Lamoreaux, Steven Keith, Schulze, Roland K., Schwarzkopf, John Dennis, Cooley, Jason Christopher, Grover, Mike, Hammerberg, James Edward, La Lone, Brandon M., Llobet Megias, Anna, Manzanares, Ruben, Martinez, John Israel, Schmidt, Derek William, Sheppard, Daniel Glen, Stevens, Gerald D., Turley, William D., and Veeser, Lynn R. Wed . "Ejecta transport, breakup and conversion". United States. doi:10.1007/s40870-017-0114-6. https://www.osti.gov/servlets/purl/1358166.
@article{osti_1358166,
title = {Ejecta transport, breakup and conversion},
author = {Buttler, William Tillman and Lamoreaux, Steven Keith and Schulze, Roland K. and Schwarzkopf, John Dennis and Cooley, Jason Christopher and Grover, Mike and Hammerberg, James Edward and La Lone, Brandon M. and Llobet Megias, Anna and Manzanares, Ruben and Martinez, John Israel and Schmidt, Derek William and Sheppard, Daniel Glen and Stevens, Gerald D. and Turley, William D. and Veeser, Lynn R.},
abstractNote = {Here, we report experimental results from an initial study of reactive and nonreactive metal fragments—ejecta—transporting in vacuum, and in reactive and nonreactive gases. We postulate that reactive metal fragments ejected into a reactive gas, such as H2, will break up into smaller fragments in situations where they are otherwise hydrodynamically stable in a nonreactive gas such as He. To evaluate the hypothesis we machined periodic perturbations onto thin Ce and Zn coupons and then explosively shocked them to eject hot, micron-scale fragments from the perturbations. The ejecta masses were diagnosed with piezoelectric pressure transducers, and their transport in H2 and He was imaged with visible and infrared (IR) cameras. Because Ce + H2 → CeH2 + ΔH, where ΔH is the enthalpy of formation, an observed increase of the relative IR (radiance) temperature TR between the Ce–H2 and Ce–He gas systems can be used to estimate the amount of Ce that converts to CeH2. As a result, the experiments sought to determine whether dynamic chemical effects should be included in ejecta-transport models.},
doi = {10.1007/s40870-017-0114-6},
journal = {Journal of Dynamic Behavior of Materials},
number = 2,
volume = 3,
place = {United States},
year = {Wed Apr 26 00:00:00 EDT 2017},
month = {Wed Apr 26 00:00:00 EDT 2017}
}

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