LONG LIFE CLOSED LOOP MHD RESEARCH AND DEVELOPMENT UNIT.
Interim rept. no. 6, 15 June-15 Sep 63,
WESTINGHOUSE ELECTRIC CORP PITTSBURGH PA
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The effect of wall friction and heat transfer on MHD devices has been examined and the key parameters affecting the efficiency are given. A Reynolds analogy was used to study the effect of heat transfer. Photoionization has been proposed as a means of ionizing the gas in the MHD duct. An experiment was devised to measure the electrical conductivity of a Cs vapor which is ionized by ultra-violet radiation from commercial mercury lamps. Using the ultra-violet radiation from two H-4 100 watt mercury lamps, an electrical conductivity of approximately .01 mhom was measured for a Cs pressure of x.01 torr. Calculations indicate that ambipolar diffusion is the dominating electron-ion pair loss mechanism. Therefore, the measured electrical conductivity may be larger than the measured value if this loss mechanism is retarded. Author