Accession Number : AD0785434

Title :   Supersonic Expansion of Nonequilibrium Plasmas.

Descriptive Note : Interim rept.,


Personal Author(s) : Igra,O.

Report Date : APR 1974

Pagination or Media Count : 142

Abstract : In the supersonic expansion of an ionized gas, the dominant factor in models describing the atomic processes is the recombination rate constant (K sub R). Several models describing the recombination process have been reviewed in some detail. It has been found that, depending on the adopted definition, different models will yield different values of (K sub R) for the same electron temperature and number density. A comparison of experimentally and theoretically derived values for (K sub R) has to be done with great care, as in the majority of the experiments (K sub R) is determined from the measured rate of disappeareance of free electrons. These measurements give the correct 'decay coefficient', but only in certain circumstances will it reduce to the correct recombination rate. It was found that the theoretically predicted values for the three-body, electron-ion-electron collisional-recombination rate are in good agreement with those measured gasdynamically in a well-defined flow. (Modified author abstract)

Descriptors :   *Plasmas(Physics), *Supersonic flow, Recombination reactions, Electron energy, Electron density, Equations of motion, Partial differential equations, Canada

Subject Categories : Plasma Physics and Magnetohydrodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE