Download Rarefied gas dynamics : technical papers from the by Bernie D Shizgal; David P Weaver PDF

By Bernie D Shizgal; David P Weaver

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Read or Download Rarefied gas dynamics : technical papers from the proceedings of the Eighteenth International Symposium on Rarefied Gas Dynamics, University of British Columbia, Vancouver, British Columbia, Canada, July 26-30, 1992 PDF

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Additional resources for Rarefied gas dynamics : technical papers from the proceedings of the Eighteenth International Symposium on Rarefied Gas Dynamics, University of British Columbia, Vancouver, British Columbia, Canada, July 26-30, 1992

Example text

It is seen from Fig. 4(a) that the facility is capable of producing shock Mach numbers for nitrogen is in excess of 20 at the highest stagnation temperature available. 5 cm for this condition. It can also be seen in Fig. 4(b-c) that the size of the jet begins to shrink as the mass flow decreases. This limits the degree of rarefaction achievable in the flowfields. 035 g/s, resulting in a tunnel back pressure of 50 millitorr. This will limit the usable portion of the plot for mean free path shown in Fig.

Commercially available bottled gases supply the flow reservoir. The elevated stagnation temperatures are achieved by flowing the gases into an alumina ceramic tube, upon which there is a tungsten filament winding (see Fig. 2 for schematic of stagnation heater). The freejet emerges from a thin plate orifice machined into the closed end of the tube. This stagnation heater was designed to incorporate several features from a heater described by Lam19 who constructed a heater that was used to generate high-temperature molecular beams of atomic oxygen.

J............... 6 Mass Flow (g/s) Fig. 4 (continued) Row parameters for nitrogen freejets in the Berkeley wind tunnel (Tg is stagnation temperature in K, and Dj is orifice diameter in mm): (a) barrel shock Mach number at Mach disk, (b) barrel shock length up to Mach disk, (c) barrel shock diamater at Mach disk, (d) flow velocity at Mach disk, (e) mean free path at Mach disk with gas molecules induce a characteristic visible and near UV fluorescence. 5 m Jarrell Ash scanning spectrometer equipped with a liquid nitrogen cooled RCA 1P21 photomultiplier tube.

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