Shock-induced C₂H₂ pyrolysis and CO emissivity

• Main Author: Hooker, William Joseph
• Format: Others
• Language: en
• Published: 1958
• Online Access: https://thesis.library.caltech.edu/3973/1/Hooker_wj_1958.pdf; Hooker, William Joseph (1958) Shock-induced C₂H₂ pyrolysis and CO emissivity. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/J37Y-C144. https://resolver.caltech.edu/CaltechETD:etd-10072004-144737 <https://resolver.caltech.edu/CaltechETD:etd-10072004-144737>

<p>PART I: Shock Tube Studies of Acetylene Decomposition</p> <p>Extensive experimental studies have been conducted on the rate of decomposition of argon-acetylene mixtures by means of shock waves. Activation energies of 26 and 33 kcal/mole, respectively, have been found for the first- and second-order decomposition reactions of acetylene.</p> <p>A well defined curve of temperature versus induction time for incipient carbon formation has been established. Analysis of these data suggests that possibly a somewhat better correlation is obtained for decomposition reactions of order n=1 and n=1.5 than for n=2. The corresponding activation energies are 10, 13 and 16 kcal/mole for n= 1, 1.5 and 2, respectively.</p> <p>The effects of impurity and diluent gas radiation, as well as molecular and solid particle light scattering, have been shown to have a negligibly small influence on the results.</p> <p>PART II: An Analysis of Equilibrium Infrared Gas Emissivities for Diatomic Molecules Based on a Just-overlapping Rotational Line Model</p> <p>General equations are developed for the engineering emissivity of diatomic molecules with equally intense R- and P-branches and just-overlapping rotational line structures. Integral expressions for the emissivity are evaluated by exact numerical integration and by approximate series representations.</p> <p>The results are applied to the molecules CO and HC ℓ. Comparisons are made with emissivity predictions for the same molecules with a completely overlapped rotational line model and an isolated rotational line model. The theoretical emissivity calculations for CO are in fair accord with empirically determined estimates.</p>