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DIFFUSION IN EXPANDING ELECTRICALLY NEUTRAL GASES WITH LARGE PRESSURE GRADIENTS. PART II. SHOCK TUBE FLOW USING GAS MIXTURES IN THE COMPRESSION CHAMBER
FRANKFORD ARSENAL PHILADELPHIA PA PITMAN-DUNN RESEARCH LABS
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The mathematical model developed in Part I AD- 274 781 is evaluated for theoretical shock tube flow. A brief review of the theory for ideal shock tube flow is presented regarding notation and terminology. Then, a diffusion equation is used to determine the transient composition within the expanding compression chamber gas. Numerical calculations are made for argon-helium mixtures and nitrogen-helium mixtures. The result is that composition changes of the order 1 of the initial composition are predicted. Relationships between the magnitude of the composition changes, diaphragm pressure ratio, and initial composition are presented graphically for use in experimental studies. Author
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