Abstract
Observations of the flow of plasma in an electromagnetic shock tube are presented. Three regimes of flow are found in hydrogen. At high initial gas pressure (>1 Torr) and low speeds (<2 cm/μsec) a cold shock-heated region of gas followed by hot turbulent expanding driver gas was found. At low initial gas pressure (<0.5 Torr) and high speeds (>4 cm/μsec) a single hot turbulent body of gas moved down the tube. An intermediate flow was found in the intermediate pressure-speed regime. The onset of turbulence in the flow was found to be described by the hydrodynamic Reynolds number.
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