Dynamic high-pressure studies of an electrothermal capillary

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This paper describes arc discharge tests conducted in a prepressurized, constant-volume pressure vessel to study arc behavior over a wide range of current densities, discharge durations and initial vessel pressures. This method allows controlled access to a wider range of conditions than those previously studied in capillary tests. We have investigated aspects of the radiative heat transfer by calculating the material opacity and mean free paths of photons for conditions typical of arc diagnostics. We also performed one-dimensional Eulerian hydrodynamic calculations of the boundary layer behavior in the radiative diffusion approximation. These calculations, which describe the radial mass flow and ... continued below

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Pages: (10 p)

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Benson, D.A. & Cahill, P.A. January 1, 1990.

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Description

This paper describes arc discharge tests conducted in a prepressurized, constant-volume pressure vessel to study arc behavior over a wide range of current densities, discharge durations and initial vessel pressures. This method allows controlled access to a wider range of conditions than those previously studied in capillary tests. We have investigated aspects of the radiative heat transfer by calculating the material opacity and mean free paths of photons for conditions typical of arc diagnostics. We also performed one-dimensional Eulerian hydrodynamic calculations of the boundary layer behavior in the radiative diffusion approximation. These calculations, which describe the radial mass flow and heat transfer in the absence of turbulent flow effects, show the characteristic times for equilibrium of the high-pressure arc. Finally, we describe progress on a promising means for increasing the mass flux from the capillary discharge through the use of chemically reactive media on the capillary walls. 20 refs., 7 figs.

Physical Description

Pages: (10 p)

Notes

NTIS, PC A02/MF A01 - OSTI; GPO Dep.

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  • 27. JANNAF combustion meeting, Cheyeene, WY (USA), 5-9 Nov 1990

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  • Other: DE91000966
  • Report No.: SAND-90-2494C
  • Report No.: CONF-9011119--1-Draft
  • Grant Number: AC04-76DP00789
  • Office of Scientific & Technical Information Report Number: 6426264
  • Archival Resource Key: ark:/67531/metadc1207872

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Office of Scientific & Technical Information Technical Reports

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  • January 1, 1990

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  • July 5, 2018, 11:11 p.m.

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  • Dec. 11, 2018, 2:47 p.m.

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Benson, D.A. & Cahill, P.A. Dynamic high-pressure studies of an electrothermal capillary, article, January 1, 1990; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc1207872/: accessed December 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.