A theoretical investiation of steady radiation
fronts was carried out for the experimentally realistic
situation in which ionizing or dissociating radiation
passes through a transparent window into an absorbing
gas. It was shown that five different types of radiation
fronts may occur -depending on the ratio of photon
flux to absorber density. It was possible to calculate
the flow in each case provided the final temperature
behind the radiation front was assumed. This final temperature
may be calculated if the structure and all reactions
within the radiation front are taken into account.
An analytic expression can be obtained if particle
motion and recombination are neglected , and the
radiation is assumed to be monochromatic. This ideal
case corresponds closely to a weak R-type radiation front.
A first order relativistic correction indicates that the
width of the front decreases as the velocity of the front
approaches the speed of light.
In an associated experiment radiation fronts in
oxygen and iodine were produced by an intense light pulse
from a constricted arc. The experiment in iodine demonstrated
the beginning of the formation of a radiation
front during the 10 μsec light pulse. Radiation induced
shock waves were observed in oxygen after the decay of
the light pulse. These Mach 1.1 shocks were considered
theoretically as unsteady one-dimensional flow and were
treated by the method of characteristics, which was modified
to include the energy input. The agreement between
the theoretical and experimental results was satisfactory. / Science, Faculty of / Physics and Astronomy, Department of / Graduate
| Identifer | oai:union.ndltd.org:UBC/oai:circle.library.ubc.ca:2429/42426 |
| Date | January 1968 |
| Creators | Zuzak, William W. |
| Publisher | University of British Columbia |
| Source Sets | University of British Columbia |
| Language | English |
| Detected Language | English |
| Type | Text, Thesis/Dissertation |
| Rights | For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use. |
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