Accession Number : AD0605485

Title :   PROJECT COLD SHOT, PARTICLE THERMAL RADIATOR.

Descriptive Note : Master's thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Durling,Garrett Wilbur ,Jr.

Report Date : AUG 1964

Pagination or Media Count : 8

Abstract : 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)

Descriptors :   (*HEAT TRANSFER, METALS), (*RADIATORS(HEATING AND COOLING), SPACECRAFT), (*THERMAL RADIATION, HEAT TRANSFER), PARTICLES, SURFACE PROPERTIES, METAL PLATES, HEATING, VACUUM, THERMODYNAMICS, EQUATIONS

Distribution Statement : APPROVED FOR PUBLIC RELEASE