The Visible Radiation from Helium in a Strong Shock Wave Page: 60
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per unit area, corresponding to an Initial pressure of LO ran Hg, was
about 50 atm, and the mass per square centimeter cf the reflecting wall,
was about 1.6 grams. Then the distance d, moved by the end plate
during the lifetime of the reflected ahock wave (~10 pccc) was
1 P2 2
1.6 x 10“^
This would correspond to a fractional error in of about 1.6 x 10"5/U a
U x 10’^ which is certainly negligible.
The assumption that radiation losses were negligible in the region
behind the reflected shock wave can be substantiated somewhat by rough
calculations based on data on Fig. 20. The total enthalpy per cubic cent!
meter, Hy, of the gas in region 2, again for an initial pressure of 40
mm Hg, was
H . 5 N(l.+ <x )kT +<x NkT
v 2 2 2 2 ion
where N «* nuclei/cra^ » 1.7 X 10®
o<2 • 0.06
T2 . 22,000*K
• 1.8 x 10^ ergs/cm3
Losses due to toreros strahlung, re combination, and line radiation will be
'discussed separately and each will be compared with IL»
According to Spitxer*4 the energy radiated in the form of bremo-
strahlung from a partially ionixed gas is
L. Spitter, Jr., Physics of Fully Ionized Gases ( Interscience
Tracts on Physics and Astronomy," Vol. 3; Interscience Publishers, Inc.,
Nev York, 1956).
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Seay, Glenn Emmett. The Visible Radiation from Helium in a Strong Shock Wave, report, January 1957; Los Alamos, New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc502356/m1/67/: accessed June 24, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.