Accession Number : AD0287095

Title :   SLOW FLOW OF A DISSOCIATED GAS ABOUT A CATALYTIC PROBE: A TECHNIQUE OF MEASURING CATALYTIC EFFICIENCIES OF SURFACES AND DIFFUSION COEFFICIENTS OF A DISSOCIATED GAS

Corporate Author : AEROSPACE CORP EL SEGUNDO CALIF

Personal Author(s) : HARTUNIAN,R.A. ; LIU,S.W.

Report Date : 20 JUL 1962

Pagination or Media Count : 1

Abstract : A solution to the problem of the flow at low Reynolds number of a dissociated gas about a catalytic probe was obtained using the method of inner and outer expansions. The solution gives the atom concentration distribution about the probe as a function of the Reynolds number based on diffusion and the parameter K = k' a/D where k' is the effective speed of the surface reaction, D is the diffusion coefficient, and a the radius of the probe. It is shown that, from a measurement of the heat transfer to the probe and an independent measurement of the free-stream atom concentration, one can establish the catalytic efficiency of the surface when K << 1 and the diffusion coefficient when K >> 1. Conversely, knowing either the diffusion coefficient or the catalytic efficiency, the probe may be used to determine atom concentrations. The results of the theory are used to establish experimental co ditions in a glow discharge facility under which the sought data may be obtained. Plots of valid operating regimes of this facility are presented. (Author)

Descriptors :   *CATALYSTS, *DISSOCIATION, *GAS FLOW, *HEAT TRANSFER, *RECOMBINATION REACTIONS, INSTRUMENTATION, MEASURING INSTRUMENTS

Distribution Statement : APPROVED FOR PUBLIC RELEASE