Vibrational relaxation of N2OAr and CH4Ar mixtures. Shock tube experiments and master equation calculations

Autor:	Zein Baalbaki, John E. Dove, Wing S. Nip, Heshel Teitelbaum
Rok vydání:	1986
Předmět:	Shock wave Chemistry Schlieren Master equation Vibrational energy relaxation General Physics and Astronomy Relaxation (physics) Thermodynamics Physical and Theoretical Chemistry Mole fraction Shock tube Dilution
Zdroj:	Chemical Physics. 104:107-122
ISSN:	0301-0104
DOI:	10.1016/0301-0104(86)80157-4
Popis:	The vibrational relaxation of N2OAr mixtures has been studied by laser schlieren measurements in shock waves and by numerical integration of the master equation for vibration—translation and vibration—vibration energy transfer. The system shows some deviations from the linear mixture rule, particularly at high temperatures and low mole fractions of N2O. The expression log10(pτ/atm μs)N2OAr = −1.317 + 13.655T −1 3 appears to fit our measurements and literature data to within 20% over the range 300–1600 K, but because of mixture rule non-linearity this result should be used with caution, especially at high temperatures. Laser schlieren measurements gave log10(pτ) = −2.680 + 19.235T −1 3 for pure CH4 at 340 to 700 K. Relaxation in mixtures containing from 0.5 to 50% CH4 in Ar was also measured, but here the observed deviations from the linear mixture rule were so great that it was not possible to extrapolate to extrapolate the measurements reliably to obtain a relaxation rate for CH4 at infinite dilution in Ar.
Databáze:	OpenAIRE
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