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Nonequilibrium Processes in Supersonic Jets of N2, H2, and N2 + H2 Mixtures: (II) Shock Waves

AutorRamos, Ángel ; Tejeda, Guzmán ; Fernández Sánchez, José María ; Montero, Salvador
Fecha de publicación29-jul-2010
EditorAmerican Chemical Society
CitaciónJournal of Physical Chemistry A 114 (29): 7761–7768 (2010)
ResumenWe report an experimental study of the shock wave system of three continuous axisymmetric jets of pure N2 and H2, and of the N2 + 2H2 mixture, generated at p0 ) 1 bar and T0 ) 295 K through a D ) 310 μm cylindrical nozzle against a background pressure pb ) 6.1 mbar. Number density and rotational populations have been measured by Raman spectroscopy with high spatial resolution (∼15 μm) across the normal shock wave located at z/D ≈ 8, and across the barrel shock wave at the plane z/D ) 5.2. Significant differences in position, widths, and gradients of the shock waves are observed among the three jets. Such differences are qualitatively interpreted in terms of disparity in mass, inelastic cross sections, and collision numbers. Non- Boltzmann distributions of the rotational populations of N2 are observed within the shock waves at regions where the local Knudsen number is higher than 0.05. In the N2 + 2H2 mixture the different behavior of the two species leads to a localized enrichment of the light component up to 20%, which might provide the basis for an efficient separation device. Measurements on the invasion of the shock wave system by the background molecules are also reported, proving such invasion to be more efficient for the lighter species H2 than for the heavier N2.
Descripción8 pages, 8 figures,
Versión del editorhttp://dx.doi.org/10.1021/jp1040053
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