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Diffusion in a slightly ionized gas with application to effusion from a shock tube

Sturtevant, Bradford (1961) Diffusion in a slightly ionized gas with application to effusion from a shock tube. Physics of Fluids, 4 (9). pp. 1064-1073. ISSN 0031-9171. http://resolver.caltech.edu/CaltechAUTHORS:STUpof61

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Abstract

A sampling technique for measuring the diffusive flux of charged particles from an ionized gas to a cold wall by measuring the effusive electrical current through a small orifice in the wall has been used to study slightly ionized argon behind reflected shock waves. The technique is described and the transient diffusion process upon which it depends is considered in some detail. Computations based on a simple one-dimensional isothermal charge diffusion model illustrate the features and give the result that the effect of the electric body forces is generally greater on the ions and less on the electrons than originally expected. These results are used in an approximation to the nonisothermal problem to give a relation between the measured effusive current and the ion density in the hot gas. Preliminary observations of the dependence of ion density on time and temperature in the initial stages of ionization relaxation are reported. Simple considerations of the chemical kinetics indicate that for the portion of the process observed (degree of ionization about 10^–5 times the equilibrium value) the ionization of argon results from a complicated series of consecutive reactions.


Item Type:Article
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http://dx.doi.org/10.1063/1.1706451DOIUNSPECIFIED
Additional Information:© 1961 The American Institute of Physics. Received February 13, 1961. The author wishes to express his appreciation to Professors H.W. Liepmann, A. Roshko, and J.D. Cole for their invaluable assistance during the course of this work. This work was supported by the Office of Naval Research. This work was reported in part in B. Sturtevant, "Effusion of charged particles from a shock heated gas," GALCIT Rept. California Institute of Technology, Pasadena, California, 1960 (unpublished).
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Office of Naval ResearchUNSPECIFIED
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Deposited On:27 Oct 2008 21:50
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