A Shock Tube Study of Vibrational Relaxation in Nitrous Oxide PDF Download
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Author: C.J.S.M. Simpson
Publisher:
ISBN:
Category :
Languages : en
Pages : 10
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Author: C.J.S.M. Simpson
Publisher:
ISBN:
Category :
Languages : en
Pages : 10
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Author: Jagnandan Kumar Bhangu
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: KURT L. WRAY
Publisher:
ISBN:
Category :
Languages : en
Pages : 1
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The vibrational relaxation time of nitric oxide in NO-Ar mixtures was determined over the temperature range 1500-7000 K. An ultraviolet absorption technique using 1270 A radiation was employed to monitor the vibrational temperature as a function of time after these mixtures were shock heated to high translational temperatures. P10, the transition probability per oscillator per collision for transition between vibrational levels 1 and 0 calculated from the measured relaxation times ranged from 0.001 at 1500 K to 0.028 at 7000 K for NO-NO collisions. Argon is about 1/50 as efficient as NO. The results are compared with the lower temperature (400-1500 K) work of Robben and with the adiabatic theory of Schwartz, Slawsky, and Herzfeld and the nonadiabatic theory of Nikitin. (Author).
Author: Kurt L. Wray
Publisher:
ISBN:
Category : Chemical kinetics
Languages : en
Pages : 41
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A shock tube program was carried out in which the NO concentration was followed as a function of time behind the shock front by absorption of 1270A radiation, where ground vibrational state O2 and N2 are essentially transparent. The absorption coefficients of the species NO, O2 and N2 as functions of the respective vibrational temperatures were determined by measuring theABSORPTION BY THE SHOCK-HEATED GAS AT A POINT IN THE TIME HISTORY CORRESPONDING TO COMPLETE VIBRATIONAL RELAXATION BUT BEFORE THE ONSET OF DISSOCIATION. Time history analyses were made on a total of 42 shock tube runs covering a temperature range of 3000-8000 K on the following six mixtures: 1/2% NO, 1/2% NO + 1/4% O2, 10% NO, 50% NO, 20% air and 100% air. The diluent in all cases was argon. An IBM 704 computer was programmed to integrate the vibrational and chemical rate equations as a function of time behind the shock front, subject to the constraints of the conservation equations. The pertinent rate constants were varied in a systematic trial and error manner in order to get the best fit to all the data. (Author).
Author: Joseph Alan Stregack
Publisher:
ISBN:
Category : Carbon dioxide
Languages : en
Pages : 188
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Author: Donald R. White
Publisher:
ISBN:
Category :
Languages : en
Pages : 62
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The report summarizes the research performed under this contract in the general areas of vibrational relaxation and shock tube chemistry. The authors have unsuccessfully attempted to generate cylindrical detonations in H2-O2 under conditions such that the reaction zone and shock front could be observed first to separate and hopefully then to reattach. The induction time for methane has been measured over a wide range of pressure, temperature, stoichiometry, and diluent using both incident and reflected shock waves. An activation energy of about 51 kcal/mole is found, larger than that of several other investigators largely due to our observation of longer times at the lower temperatures. In the H2/CO/O2 system the combination of flame and interferometric shock data has earlier proved valuable in selection from among alternative kinetic schemes, but laminar reaction zones have been unattainable in methane oxidation without use of an additive to speed the reaction. Qualitatively, acetone, methyl alcohol, and acetylene all accelerate the reaction to a decreasing extent. Hydrogen has been used as an additive to obtain density profiles adequate for comparison with computed profiles using a complex reaction scheme. A first attempt at computer reconciliation of flame and shock tube data has been made with encouraging results, and changes to be incorporated in the next iteration of the kinetic system have been identified. (Author).
Author: James Franklin Roach
Publisher:
ISBN:
Category : Energy transfer
Languages : en
Pages : 286
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Author: Y.V. Stupochenko
Publisher: Springer Science & Business Media
ISBN: 3642482465
Category : Technology & Engineering
Languages : en
Pages : 404
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Author: Kurt L. Wray
Publisher:
ISBN:
Category :
Languages : en
Pages : 37
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The kinetics of the reaction O + N2 + 3.3 eV yields NO + N were investigated under conditions where the vibrational temperature of the nitrogen was less than the translational temperature. The formation of NO behind incident shock waves in dilute O3-N2 mixtures was studied over the temperature range 3100-6400K with initial pressures of 2 to 25 torr. In the shock front O3 yields O + O2 and the reaction of the O with N2 is then rate-limiting, followed by the fast reaction N + O2 yields NO + O. The NO was monitored in emission at 5.3 microns and the initial slopes were compared to theoretical calculations which included vibrational relaxation processes. The radiation rose linearly from the shock front with no incubation in accord with the theoretical calculations employing only translational energy to determine the fraction of collisions whose energy was above the endothermicity of reaction. (Author).
Author: R. Gutteridge
Publisher:
ISBN:
Category :
Languages : en
Pages :
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