THE TEMPERATURE DEPENDENCE OF THE THERMAL CONTACT RESISTANCE ACROSS NONMETALLIC INTERFACES
Abstract
Extensive measurements of thermal contact resistance were conducted in the following study areas, where no previous systematic measurements have been performed: (1) interfaces consisting of brittle, nonmetallic components, and (2) radiative transport across the interface at high temperatures. An apparatus for performing the measurements to elevated temperatures was designed, constructed, and performance tested. The equipment, operated in vacuum environments, utilized tantalum heaters to develop heat flow down a specimen column which was water cooled at its base. The contact resistance specimen column consisted of two high purity beryllium oxide cylinders, 1 inch in diameter and 1.5 inches in length. The successful performance of the apparatus was demonstrated by measuring the thermal conductivity of beryllium oxide and tantalum as a function of temperature. Analytical predictions of heat losses from the specimen column were made through solution of the boundary-value problem for the temperature field in the insulation segment surrounding this column. The results compared favorably with experimental heat loss measurements.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1969
- Accession Number
- AD0697988
Entities
People
- Merrill L. Minges
Organizations
- Air Force Research Laboratory