Accession Number : AD0722779

Title :   On the Sudden-Freeze Approximation in a Vibrationally Relaxing Gas.

Descriptive Note : Technical rept.,

Corporate Author : LEHIGH UNIV BETHLEHEM PA CENTER FOR THE APPLICATION OF MATHEMATICS

Personal Author(s) : Shih,C. J. ; Blythe,P. A.

Report Date : FEB 1971

Pagination or Media Count : 22

Abstract : It is shown that, in contrast with the weak excitation limit, the sudden freeze approximation does provide a valid description of non-equilibrium nozzle flows in a vibrationally relaxing gas when the relaxation time changes exponentially fast with the translational temperature. The accuracy of the method is improved by the introduction of a modified freezing point. Only flows for which this freezing point lies downstream of the sonic point are considered. The expansion procedures outlined here should be useful in more general problems. (Author)

Descriptors :   (*NOZZLE GAS FLOW, FREEZING), ONE DIMENSIONAL FLOW, DIFFERENTIAL EQUATIONS, NUMERICAL ANALYSIS, ASYMPTOTIC SERIES

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE