PROJECT COLD SHOT, PARTICLE THERMAL RADIATOR.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO
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The heating of small metallic particles during impact on a charged hot surface is studied experimentally. A proposed radiator design for space application used particles heated in this manner to produce a light weight radiator with a large radiating surface. Previous theoretical studies of this design assumed that the particle was heated to almost 100 of the hot surface temperature before being repelled from the surface the purpose of this study was to investigate that assumption. In a vacuum of three micromillimeters of mercury the particles were bounced off a surface on which a temperature as high as 155C and a perpendicular electric field as high as 100,000 volts per meter were maintained. The particles were collected in a calorimeter where the amount of heat gained by them was measured. Negligible heat transfer was indicated with typical test results showing a change in particle temperature of 0.45 0.89C and a heat gain of only 0.37 0.72 of the amount required to raise the particle temperature up to that of the hot surface. Author