Accession Number : AD0266598

Title :   A METHOD OF IMPROVING THE HEAT TRANSFER IN RIGID COAXIAL LINES

Descriptive Note : Interim rept.

Corporate Author : NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s) : BURKETT,J.

Report Date : 27 OCT 1961

Pagination or Media Count : 10

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)

Descriptors :   *COAXIAL CABLES, *ELECTRICAL PROPERTIES, *POWER, AIR, CHROMATES, CONDUCTIVITY, HEAT, HEAT TRANSFER, HELIUM, PAINTS, PRESSURE, REDUCTION, TEMPERATURE, ZINC COMPOUNDS

Distribution Statement : APPROVED FOR PUBLIC RELEASE