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Diagnostics of H2O andH2O+He Supersonic Jets by Raman Spectroscopy

AutorTejeda, Guzmán ; Fernández Sánchez, José María ; Montero, Salvador
Palabras claveSupersonic jets
Water
Helium
Inelastic collisions
Raman spectroscopy
Fecha de publicación2012
EditorAmerican Institute of Physics
CitaciónAIP Conference Proceedings - American Institute of Physics, 1501 : 1305-1313 (2012)
ResumenThe stagnation conditions for production of pure H2O and H2O+He supersonic jets free of condensation are reported. Number densities and rotational populations of uncondensed H2O+He jets have been measured by Raman spectroscopy. This diagnostics is aimed at characterizing quantitatively the main ow properties: number densities, rotational and translational temperatures, ow velocity, rotational populations and their gradients along the jet. Combining these data in a Master Equation accounting for the evolution of rotational populations along the jet, a description has been shown feasible in terms of average rate coef cients for inelastic collisions, a novel concept which simpli es considerably the molecular interpretation of non-equilibrium and relaxation. Experimental average rates for H2O:He inelastic collisions are in the range of 340 to 700×10−20 m3s−1, somewhat larger than the corresponding values from ab-initio calculations. Rates for H2O:H2O inelastic collisions are 4 to 7 times larger than for H2O:He collisions. C 2012 American Institute of Physics
Descripción28th International Symposium on Rarefied Gas Dynamics 2012. AIP Conf. Proc. (2012); 9 pags. ; 5 figs. ; 3 tabs. ; PACS: 47.40 Ki, 34.50 Ez, 33.20 Fb
Versión del editorhttp://dx.doi.org/10.1063/1.4769692
URIhttp://hdl.handle.net/10261/108320
DOI10.1063/1.4769692
ISSN0094-243X
E-ISSN1551-7616
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