On the Sudden-Freeze Approximation in a Vibrationally Relaxing Gas.
LEHIGH UNIV BETHLEHEM PA CENTER FOR THE APPLICATION OF MATHEMATICS
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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
- Fluid Mechanics