A Cryogenic Shock Tube: Low Temperature Shock Waves in Molecular Hydrogen.
MICHIGAN UNIV ANN ARBOR DEPT OF PHYSICS
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A shock tube has been applied to the study of low temperature shock waves in molecular hydrogen and parahydrogen. The Rankine-Hugoniot shock equation, behaves nonclassically for normal hydrogen and parahydrogen. This is due to the change in the number of degrees of freedom across the shock caused by the excitation of the rotational energy states. The predicted Rankine-Hugoniot curves have been experimentally measured and confirmed. This was done by simultaneous measurement of the shock speed and the density ratio the latter by means of a Mach-Zehnder interferometer with a laser light source. Pressure measurements also were made using a quartz piezoelectric transducer. Rotational relaxation times have been measured for normal hydrogen and parahydrogen. This has been accomplished using a high sensitivity schlieren optical system with a laser light source and a photomultiplier recording system. Author
- Test Facilities, Equipment and Methods
- Fluid Mechanics