Quantitative description of chain explosion by a linear approximation of the theory of branched chain processes

1987 ◽  
Vol 36 (9) ◽  
pp. 1954-1957
Author(s):  
E. N. Aleksandrov ◽  
V. S. Arutyunov ◽  
I. V. Dubrovina ◽  
S. N. Kozlov
Keyword(s):  
Linear Approximation ◽  
Quantitative Description ◽  
Chain Processes ◽  
Branched Chain ◽  
Chain Explosion

Age—length distributions for branched chain processes

1992 ◽  
Vol 165 (2-3) ◽  
pp. 231-243 ◽  
Author(s):  
Marcel Ovidiu Vlad
Keyword(s):  
Chain Processes ◽  
Branched Chain

Shock Tube Studies of the Reactions of Hydrogen Atoms. I. The Reaction H + NH3 → H2 + NH2

1974 ◽  
Vol 52 (7) ◽  
pp. 1171-1180 ◽  
Author(s):  
John E. Dove ◽  
Wing S. Nip
Keyword(s):  
Shock Tube ◽  
Rate Coefficients ◽  
Oh Radicals ◽  
High Concentration ◽  
Hydrogen Atoms ◽  
Elementary Reactions ◽  
Temperature Range ◽  
Reflected Shock ◽  
Branched Chain ◽  
Chain Explosion

The partial equilibrium state following the branched-chain explosion of shock-heated rich H2/O2/diluent mixtures contains a high concentration of H atoms. The conditions under which this state can be used as a source of H atoms for the study of elementary reactions have been investigated. A small amount of NH3 was added to H2/O2/inert gas mixtures in order to measure the rate of the reaction H + NH3 → H2 + NH2. The pseudo-first order decay of NH3 in an approximately ten-fold excess of H atoms was followed by a time-of-flight mass spectrometer which sampled from the reflected shock region in a shock tube. The rate coefficient for this reaction, determined over the temperature range 1500–2150 °K, is 1013.44±0.10 exp −(17 400 ± 1 300 cal mol−1)/RT cm3 mol−1 s−1.It is pointed out that, under certain stated conditions, the method can also be extended to study the rates of elementary reactions involving O atoms and OH radicals. From our experiments, upper limits on the rate coefficients of the reactions OH + NH3 → H2O + NH2 and O + NH3 → OH + NH2 over the temperature range 1620–1920 °K are 8 × 109T0.08 exp (−1100/RT) and 1 × 1013 exp (−6600/RT), respectively.

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