PROJECT COLD SHOT, PARTICLE THERMAL RADIATOR.
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1964
- Accession Number
- AD0605485
Entities
People
- Garrett Wilbur Durling Jr.
Organizations
- Air Force Institute of Technology