Accession Number : AD0787884

Title :   A Continuum Theory for the Interaction of a Weakly Ionized Gas with an Emitting Surface,


Personal Author(s) : Kalnavarns,Juris

Report Date : JUN 1974

Pagination or Media Count : 158

Abstract : In problems dealing with the interaction of an ionized gas with an immersed body, the widely-used assumption that the surface acts as a perfect sink for all charged particles must sometimes be relaxed. The effects of surface electron emission (and incomplete absorption) on the behaviour of a stationary, collision-dominated, weakly ionized gas in the vicinity of a spherical probe are analyzed both in the limit of isothermal electrons and in the limit where an electron energy balance yields a variable temperature. A Knudsen layer argument relates the surface boundary conditions on the macroscopic variables to the imposed molecular conditions at the wall. Two levels of electron emission which arise naturally from the formulation are considered. (Modified author abstract)

Descriptors :   *Gas ionization, *Electron emission, Electron energy, Plasma sheaths, Electrostatic probes, Heat flux, Electron density, Ion density, Distribution functions, Theses

Subject Categories : Plasma Physics and Magnetohydrodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE