Accession Number : AD0424915

Title :   DISCONTINUITY OF SURFACE CATALYCITY IN SHOCK TUBE FLOWS,

Corporate Author : AEROSPACE CORP SAN BERNARDINO CALIF

Personal Author(s) : Chung,Paul M. ; Liu,S. W.

Report Date : OCT 1963

Pagination or Media Count : 1

Abstract : Surface recombination of atoms on a perfectly catalytic surface element located downstream of a noncatalytic surface is analyzed behind a strong moving shock. The unsteady diffusion boundary layer is considered to be chemically frozen. The solution is obtained in a form of perturbations to the instantaneous steady state solution. The region in which the rate of surface reaction can be computed with a sufficient accuracy by use of the instantaneous steady state solution is determined. The application of the theory to the operation of differential catalytic gages located either on the shock tube wall or on a flat plate inserted into shock tube is discussed. It is shown that the sensitivity of the gages can be increased by 50 to 80% readily by utilizing the catalytic surface of the gages located downstream of a noncatalytic surface. (Author)

Descriptors :   (*SHOCK TUBES, BOUNDARY LAYER), (*LAMINAR BOUNDARY LAYER, FROZEN EQUILIBRIUM FLOW), (*SHOCK WAVES, RECOMBINATION REACTIONS), GAS FLOW, HEAT TRANSFER, FLAT PLATE MODELS, HYPERSONIC FLOW, HYPERSONIC FLIGHT, PERTURBATION THEORY, SURFACE PROPERTIES, CATALYSIS, SURFACES, CHEMICAL REACTIONS, DIFFUSION, REENTRY VEHICLES, ATMOSPHERE ENTRY, DISSOCIATION, EQUATIONS, INSTRUMENTATION, SENSITIVITY

Distribution Statement : APPROVED FOR PUBLIC RELEASE