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AD-258 250N4 AD-258 251Div. 9, 25U 21 June 61 OTS price 1.60 Magnetogasdynamics Lab., Mass. Inst. of Tech., Cambridge. HEAT TRANSFER TO COLD ELECTRODES IN A FLOWING IONIZED GAS, by James A. Fay and William T. Hogan. Apr 61, 14p. illus. Rept. no. 61-2 Contract AF 49638643, Proj. 9781 AFOSR-595Unclassified report DESCRIPTORS Gas flow, Gas ionization, Shock waves, Shock tubes, Heat transfer, Electrodes, Magnetohydrodynamics, Instrumenta tion, Experi ental data, Electrical properties, Resistance. Shock tube experiments were devised to provide an aerodynamically clean flow of a partially ionized gas over a cold electrode approximately room temperature. The electrodes were tungsten wires placed in a shock tube with their axes normal to the shock tube axis, and hence perpendicular to the oncoming flow. For the special circumstances of the experiments considered, the heating of the electrodes in exces of that due to aerodynamic effects was proportional to the current over the observable range of 100 to 1000 ampsq cm. The excess heating rate divided by the total c rrent was found to be 4.9 volts for the anode and 3.2 volts for the cathode. The gas resistance as cumputed under the assumptions of uniform conductivity of the fluid between the electrodes plus a fixed voltage drop at the electrodes compared fairly well with experimental values for large electrode separations, but were below experimental values for close electrode spacing. In a carefully designed experiment, it is likely, therefore, that electrical conductivity of gases can be measured by this method. Author
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