A METHOD OF IMPROVING THE HEAT TRANSFER IN RIGID COAXIAL LINES
Abstract
IN AN ALL-COPPER 50-OHM COAXIAL LINE, APPROXIMATELY 70 PERCENT OF THE POWER LOSSES OCCUR IN THE INNER CONDUCTOR. With high-power lines the temperature rise of the inner conductor may limit the power capability of the line. It was determined that the heat transfer from inner to outer conductor can be improved by a factor of nearly five for a 100 C inner conductor temperature and 0 C outer conductor temperature by painting the inner and outer conductors. Further improvement, to a factor of seven, can be obtained by using helium instead of air for pressurization. The increase in attenuation due to zinc chromate paint was less than 0.01 db per hundred feet on 3-1/8-inch-diameter line at 108 Mc. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 27, 1961
- Accession Number
- AD0266598
Entities
People
- J. Burkett
Organizations
- United States Naval Research Laboratory