Accession Number : AD0482424

Title :   ON SHOCK TUBE SIDE WALL LANGMUIR PROBES,

Corporate Author : PRINCETON UNIV NJ GAS DYNAMICS LAB

Personal Author(s) : Liu, J. T. C.

Report Date : JAN 1966

Pagination or Media Count : 38

Abstract : Analytical forms for the local electrical characteristics and resistance associated with shock tube side wall electrodes are obtained as functions of distance behind the ionizing shock wave for large electrical Reynolds numbers. The continuum theory of Lam for the flow of weakly ionized gases over biased arbitrary bodies with absorbing surfaces is applied. The contributions to the potential drop across electrodes are form: (1) the outer region, accounting for the electrode geometry and its relative location to the current-insulating shock wave, obtained from Laplace's equation, (2) the ambipolar region, obtained from the ambipolar convective-diffusion equation, and (3) the sheath region, in terms of a universal function. The operating characteristics of the electrode system with an external circuit, as in a typical experimental setup, is discussed in detail. (Author)

Descriptors :   *SHOCK TUBES), (*LANGMUIR PROBES, ELECTRODES, WALLS, ELECTRICAL RESISTANCE, VOLTAGE, GAS FLOW, GAS IONIZATION, SHOCK WAVES, REYNOLDS NUMBER, PARTIAL DIFFERENTIAL EQUATIONS, PLASMA SHEATHS, BOUNDARY LAYER.

Subject Categories : Test Facilities, Equipment and Methods
      Plasma Physics and Magnetohydrodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE