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Author Topic: Nitro Tune Ups  (Read 103354 times)

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Offline NitroHelper

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Re: Nitro Tune Ups
« Reply #330 on: April 18, 2015, 10:35:20 pm »
Based on this info ,do you guys think we should run more than the normal 7.5:1 compression ?

The thermal decomposition of nitromethane provides a classic example of the competition between roaming mediated isomerization and simple bond fission. A recent theoretical analysis suggests that as the pressure is increased from 2 to 200 Torr the product distribution undergoes a sharp transition from roaming dominated to bond-fission dominated. Laser schlieren densitometry is used to explore the variation in the effect of roaming on the density gradients for CH3NO2 decomposition in a shock tube for pressures of 30, 60, and 120 Torr at temperatures ranging from 1200 to 1860 K.

 A complementary theoretical analysis provides a novel exploration of the effects of roaming on the thermal decomposition kinetics. The analysis focuses on the roaming dynamics in a reduced dimensional space consisting of the rigid-body motions of the CH3 and NO2 radicals. A high-level reduced-dimensionality potential energy surface is developed from fits to large-scale multireference ab initio calculations.

Rigid body trajectory simulations coupled with master equation kinetics calculations provide high-level a priori predictions for the thermal branching between roaming and dissociation. A statistical model provides a qualitative/semiquantitative interpretation of the results. Modeling efforts explore the relation between the predicted roaming branching and the observed gradients.

 Overall, the experiments are found to be fairly consistent with the theoretically proposed branching ratio, but they are also consistent with a no-roaming scenario and the underlying reasons are discussed. The theoretical predictions are also compared with prior theoretical predictions, with a related statistical model, and with the extant experimental data for the decomposition of CH3NO2, and for the reaction of CH3 with NO2...
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Offline Chi Town Brown

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Re: Nitro Tune Ups
« Reply #331 on: April 19, 2015, 11:38:24 am »
Based on this info ,do you guys think we should run more than the normal 7.5:1 compression ?

The thermal decomposition of nitromethane provides a classic example of the competition between roaming mediated isomerization and simple bond fission. A recent theoretical analysis suggests that as the pressure is increased from 2 to 200 Torr the product distribution undergoes a sharp transition from roaming dominated to bond-fission dominated. Laser schlieren densitometry is used to explore the variation in the effect of roaming on the density gradients for CH3NO2 decomposition in a shock tube for pressures of 30, 60, and 120 Torr at temperatures ranging from 1200 to 1860 K.

 A complementary theoretical analysis provides a novel exploration of the effects of roaming on the thermal decomposition kinetics. The analysis focuses on the roaming dynamics in a reduced dimensional space consisting of the rigid-body motions of the CH3 and NO2 radicals. A high-level reduced-dimensionality potential energy surface is developed from fits to large-scale multireference ab initio calculations.

Rigid body trajectory simulations coupled with master equation kinetics calculations provide high-level a priori predictions for the thermal branching between roaming and dissociation. A statistical model provides a qualitative/semiquantitative interpretation of the results. Modeling efforts explore the relation between the predicted roaming branching and the observed gradients.

 Overall, the experiments are found to be fairly consistent with the theoretically proposed branching ratio, but they are also consistent with a no-roaming scenario and the underlying reasons are discussed. The theoretical predictions are also compared with prior theoretical predictions, with a related statistical model, and with the extant experimental data for the decomposition of CH3NO2, and for the reaction of CH3 with NO2...

  You forgot to give credit to original author.

J. Phys. Chem. A, Article ASAP

DOI: 10.1021/acs.jpca.5b01563

Publication Date (Web): April 17, 2015

Copyright © 2015 American Chemical Society

*S. J. Klippenstein. E-mail: sjk@anl.gov., *R. S. Tranter. E-mail: Tranter@anl.gov.
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Offline Gaynor Spice

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Re: Nitro Tune Ups
« Reply #332 on: April 19, 2015, 11:49:56 am »
Even with the 34 inch tire? I also have 4:11s I may go to a smaller tire also.

yes

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Re: Nitro Tune Ups
« Reply #332 on: April 19, 2015, 11:49:56 am »
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