This article introduces the nouel concept of synthesizing waste-interception networks (?TINS)

The electrical conductivity of a nitrogen plasma seeded with potassium (in the form of powdered K^COs) was measured experimentally under conditions similar to those present in MHD accelerators and compared with existing theory. By accounting for the nonuniform temperature profile in the flow, reasonable agreement between theory and experiment was found. The nitrogen vibrational mode was equilibrated at the gas temperature and the degree of electron thermal nonequilibrium was found to be small with an energy loss factor of between 50 and 100 indicated for the electron-nitrogen interaction. The free potassium in the gas was determined to be 50% or less of the amount expected based on complete vaporization of the K2COs added to the gas. This was attributed to incomplete vaporization of the seed and seed condensation on the apparatus walls. Nomenclature = areaA es v\ A es (5} = definition in Table 1 a = constants in the collision frequency expansion C = constant in the collision cross-section equation c = electron speed E = electric field e = electronic charge / = distribution function I = total current j = current density k = Boltzmann's constant m = particle mass n = particle number density p = pressure Q es = average collision cross section Q es W = velocity dependent collision cross section R -channel radius r = radius S m = seed rate by mole S w = seed rate by weight T = temperature t = nondimensional electron energy u = electron energy, v X = species mole fraction x = axial distance along channel measured from channel entrance A = thermal boundary-layer thickness A' = definition in Eq. (5) 8* -velocity-displacement thickness 83* = current-displacement thickness 6 = energy loss factor 5 e ff = effective energy loss factor for the seeded plasma e = electron temperature, v X = Debye length A = ratio of Debye length to the impact parameter v = collision frequency o-= electrical conductivity T = mean time between collisions Subscripts e = electrons i = ions I = ions Presented as Paper 67-716 at the AIAA Electric Propulsion and Plasmadynamics Conference, Colorado Springs, Colo., . Credit is given to B. P. Curry (now with Physics International, San Leandro, Calif.) for developing the "collision-mixing" method described in the Appendix. * Research Engineer, Propulsion Wind Tunnel Facility. Member AIAA.I = liquid condensate n = neutral particle s = species other than electrons w = wall

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No abstract

This report was prepared as an account of work sponsored by the United States. Government. Neither the • United States nor the United States Department of Energy, nor any of their employees, nor any of their contractors, subcontractors, or their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness or usefulness of any information, apparatus, product or process •• disclosed, or represents that its use would not infringe privately owned rights. This report has been reproduced directly from the best available copy.