STUDY OF SURFACES DESIGNED TO INCREASE THERMAL RADIATION,
Abstract
This paper is a report on some of the work done during the past year on the experimental evaluation of the relative thermally emissive properties of certain radiative coatings applied to a series of systematically altered surfaces. These surfaces were made up of multiple V-grooves cut in aluminum, the included angle of which was varied from 22-1/2 to 90 to 90 degrees. It is shown that a 20 percent gain in power dissipation for a given temperature was obtained from the use of a multiple-grooved surface radiator coated with white PV-100 over that of an equivalently painted flat surface, and that a 100 percent gain in power dissipation resulted from using a grooved sandblasted surface instead of a flat sandblasted surface. A preferred groove angle is indicated, based on the data presented. The method used in this work is, in essence, the classical experiment for the determination of the Stefan-Boltzmann constant but differing in the use of samples having emissivities less than unity. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1964
- Accession Number
- AD0459468
Entities
People
- Richard C. Evans
- Robert G. Hires
Organizations
- Johns Hopkins University