Author: Peter McAllum Walsh
Publisher:
ISBN:
Category : Carbon dioxide
Languages : en
Pages : 262
Book Description
Relaxation of the Bending Mode of Carbon Dioxide by Vibration to Rotation and Vibration to Vibration Energy Transfer
Author: Peter McAllum Walsh
Publisher:
ISBN:
Category : Carbon dioxide
Languages : en
Pages : 262
Book Description
Publisher:
ISBN:
Category : Carbon dioxide
Languages : en
Pages : 262
Book Description
Coupled Vibration and Dissociation Relaxation Behind Strong Shock Waves in Carbon Dioxide
Author: Franz Hindelang
Publisher:
ISBN:
Category : Carbon dioxide
Languages : en
Pages : 44
Book Description
The harmonic oscillator rigid-rotator model has been used to calculate the relaxation region behind a shock wave in carbon dioxide. Finite relaxation rates for the three different vibrational modes and two dissociation reactions are included. Models for the coupling between the vibrational relaxation and the dissociation process are based on the assumption that dissociation can proceed from any vibrational level with equal probability. Two different models for the vibrational excitation have been examined. Solutions have been obtained for the interdependent fluid-flow, chemical rate, and vibrational relaxation-rate equations incorporating estimated rate coefficients. Results are presented in the form of flow-field profiles for density, pressure, translational and vibrational temperatures, and species concentrations. The effects of vibrational excitation, vibration-dissociation coupling, and energy exchange between the vibrational modes are investigated. The effect of vibrational relaxation and vibration-dissociation coupling is much stronger in CO2 with three different vibrational modes than in diatomic gases with only a single mode. The results of this study show that the effect of coupled vibrational relaxation and dissociation can sometimes alter the flow-field profiles by a factor of 2 compared to similar calculations without such coupling. For vibrational relaxation the results indicate that the shock-wave profiles depend primarily on the rate at which the translational energy is fed into internal modes and not so strongly on the energy distribution among the modes.
Publisher:
ISBN:
Category : Carbon dioxide
Languages : en
Pages : 44
Book Description
The harmonic oscillator rigid-rotator model has been used to calculate the relaxation region behind a shock wave in carbon dioxide. Finite relaxation rates for the three different vibrational modes and two dissociation reactions are included. Models for the coupling between the vibrational relaxation and the dissociation process are based on the assumption that dissociation can proceed from any vibrational level with equal probability. Two different models for the vibrational excitation have been examined. Solutions have been obtained for the interdependent fluid-flow, chemical rate, and vibrational relaxation-rate equations incorporating estimated rate coefficients. Results are presented in the form of flow-field profiles for density, pressure, translational and vibrational temperatures, and species concentrations. The effects of vibrational excitation, vibration-dissociation coupling, and energy exchange between the vibrational modes are investigated. The effect of vibrational relaxation and vibration-dissociation coupling is much stronger in CO2 with three different vibrational modes than in diatomic gases with only a single mode. The results of this study show that the effect of coupled vibrational relaxation and dissociation can sometimes alter the flow-field profiles by a factor of 2 compared to similar calculations without such coupling. For vibrational relaxation the results indicate that the shock-wave profiles depend primarily on the rate at which the translational energy is fed into internal modes and not so strongly on the energy distribution among the modes.
Vibrational Relaxation Processes in Carbon Dioxide and Nitrogen Mixtures
Author: Claudie Cayce Warf
Publisher:
ISBN:
Category :
Languages : en
Pages : 87
Book Description
Measurements were made on 70% N2/30% CO2 and 84% N2/16% CO2 mixtures at room temperature and at 600K. The most important result was an accurate determination of the V-T transition rates for CO2/N2 collisions and of the relative efficiency of CO2 and N2 for this V-T process. Information was also acquired in regard to the rate of energy transfer into and out of the asymmetric stretching mode of the CO2 molecule and of the resonant exchange rate between the asymmetric stretching mode of carbon dioxide and the first excited level of nitrogen (v=1). Finally a brief report discusses acoustic absorption to extract the rate of energy transfer between the vibration of the bending mode of CO2 and the O2 vibration and the rate at which O2 deexcites the bending mode of CO2 in a v-t process.
Publisher:
ISBN:
Category :
Languages : en
Pages : 87
Book Description
Measurements were made on 70% N2/30% CO2 and 84% N2/16% CO2 mixtures at room temperature and at 600K. The most important result was an accurate determination of the V-T transition rates for CO2/N2 collisions and of the relative efficiency of CO2 and N2 for this V-T process. Information was also acquired in regard to the rate of energy transfer into and out of the asymmetric stretching mode of the CO2 molecule and of the resonant exchange rate between the asymmetric stretching mode of carbon dioxide and the first excited level of nitrogen (v=1). Finally a brief report discusses acoustic absorption to extract the rate of energy transfer between the vibration of the bending mode of CO2 and the O2 vibration and the rate at which O2 deexcites the bending mode of CO2 in a v-t process.
Vibrational Relaxation in Carbon Dioxide
Author: W. J. Witteman
Publisher:
ISBN:
Category : Carbon dioxide
Languages : en
Pages : 37
Book Description
The vibrational excitation of a CO2 molecule in collision with another CO2 molecule was investigated. A derivation of the cross section by means of the method of the distorted waves and the rate of total energy transfer are presented. It was concluded that there are two relaxation processes with different relaxation times related to direct excitation of the bending mode and excitation in series of the valence mode. Experimental results confirm this conclusion. The experimental relaxation time for the bending vibration was one- half of the calculated value, which may be considered a fair agreement in view of the uncertainty involved in the interaction potential and of other approximations which had to be introduced into the calculations.
Publisher:
ISBN:
Category : Carbon dioxide
Languages : en
Pages : 37
Book Description
The vibrational excitation of a CO2 molecule in collision with another CO2 molecule was investigated. A derivation of the cross section by means of the method of the distorted waves and the rate of total energy transfer are presented. It was concluded that there are two relaxation processes with different relaxation times related to direct excitation of the bending mode and excitation in series of the valence mode. Experimental results confirm this conclusion. The experimental relaxation time for the bending vibration was one- half of the calculated value, which may be considered a fair agreement in view of the uncertainty involved in the interaction potential and of other approximations which had to be introduced into the calculations.
Scientific and Technical Aerospace Reports
Vibrational Relaxation Time of Carbon Dioxide at Low Temperature
Author: John Richard Jones
Publisher:
ISBN:
Category : Carbon dioxide
Languages : en
Pages : 172
Book Description
Publisher:
ISBN:
Category : Carbon dioxide
Languages : en
Pages : 172
Book Description
Vibrational and Rotational Relaxation in Gases
Author: James Dewe Lambert
Publisher: Oxford University Press, USA
ISBN:
Category : Language Arts & Disciplines
Languages : en
Pages : 168
Book Description
Publisher: Oxford University Press, USA
ISBN:
Category : Language Arts & Disciplines
Languages : en
Pages : 168
Book Description
Coupled Radiative and Vibrational Nonequilibrium in Carbon Dioxide, with Application to Gas Dynamics
Author: Robert Tripodi
Publisher:
ISBN:
Category : Carbon dioxide
Languages : en
Pages : 238
Book Description
Publisher:
ISBN:
Category : Carbon dioxide
Languages : en
Pages : 238
Book Description
Vibrational Energy Transfer in Carbon Dioxide
Author: John Carter Stephenson
Publisher:
ISBN:
Category :
Languages : en
Pages : 232
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 232
Book Description
The Influence of Rotational and Translational Energy Exchange on the Vibrational Relaxation of Carbon Dioxide
Author: Albert Michael D'Annunzio
Publisher:
ISBN:
Category :
Languages : en
Pages : 234
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 234
Book Description