Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/29175
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Title

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

AuthorsRamos, Ángel CSIC; Tejeda, Guzmán CSIC ORCID; Fernández Sánchez, José María CSIC ORCID ; Montero, Salvador CSIC ORCID
Issue Date29-Jul-2010
PublisherAmerican Chemical Society
CitationJournal of Physical Chemistry A 114 (29): 7761–7768 (2010)
AbstractWe 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.
Description8 pages, 8 figures,
Publisher version (URL)http://dx.doi.org/10.1021/jp1040053
URIhttp://hdl.handle.net/10261/29175
DOI10.1021/jp1040053
ISSN1089-5639
Appears in Collections:(CFMAC-IEM) Artículos




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