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Vibrational relaxation times of diatomic molecules and rocket performance

Penny, H. C. and Aroeste, Henry (1955) Vibrational relaxation times of diatomic molecules and rocket performance. Journal of Chemical Physics, 23 (7). pp. 1281-1283. ISSN 0021-9606. doi:10.1063/1.1742258.

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Computations are presented for the variation of vibrational excitation probabilities with temperature for mixtures of O_2 and N_2, and of HF and H_2. The values of six different excitation probabilities in each mixture are reported for temperatures up to 3000ºK. For each of the probabilities there is a lower temperature limit given, below which the theory of Schwartz, Slawsky, and Herzfeld, which is used here, is not applicable. Using the results for H_2-HF mixtures, we present some considerations which suggest that the expansion through the de Laval nozzle for representative H_2-F_2 rocket motors may be taken as vibrational near-equilibrium flow.

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Additional Information:© 1955 American Institute of Physics. Received October 11, 1954. Online Publication Date: 29 December 2004. Supported by contract with the Office of Naval Research and the Office of Ordnance Research. Presented at the 126th National Meeting of the American Chemical Society, New York, New York, September, 1954. This article uses, in part, the results of a thesis submitted by H. C. Penny, Lieutenant, U. S. Navy, in partial fulfillment of requirements for the degree of Aeronautical Engineer, California Institute of Technology, June 1954.
Group:Guggenheim Jet Propulsion Center
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Office of Naval Research (ONR)UNSPECIFIED
Office of Ordnance ResearchUNSPECIFIED
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Guggenheim Jet Propulsion Center UNSPECIFIED
Issue or Number:7
Record Number:CaltechAUTHORS:20110119-103028935
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Official Citation:Vibrational Relaxation Times of Diatomic Molecules and Rocket Performance H. C. Penny and Henry Aroeste J. Chem. Phys. 23, 1281 (1955); doi:10.1063/1.1742258
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:21808
Deposited By: Ruth Sustaita
Deposited On:19 Jan 2011 19:01
Last Modified:09 Nov 2021 16:00

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