Thermal contact conductance of non-flat, rough, metallic coated metals
- San Jose State Univ., CA (United States). Dept. of Mechanical Engineering
- Texas A and M Univ., College Station, TX (United States). Dept. of Mechanical Engineering
Thermal contact conductance is an important consideration in such applications as thermally induced stress in supersonic and hypersonic flight vehicles, nuclear reactor cooling, electronics packaging, spacecraft thermal control, and gas turbine and internal combustion engine cooling. In many instances, the highest possible thermal contact conductance is desired. For this reason, soft, high conductivity, metallic coatings are sometimes applied to contacting surfaces (often metallic) to increase thermal contact conductance. Two previously developed theoretical models for thermal contact conductance of metallic coated metals have been proven accurate for flat, rough surfaces. However, these two theories often substantially over-predict the conductance of non-flat, rough, metallic coated metals. In this investigation, a previously developed semi-empirical conductance model for flat and non-flat, rough, uncoated metals is employed in predicting the conductance of flat and non-flat, rough, metallic coated metals. The more commonly cited of the previous theoretical models for flat surfaces and the semi-empirical model are compared to experimental thermal contact conductance results from a number of investigations in the literature. Results for a number of metallic coating/substrate combinations on surfaces with widely varying flatness and roughness were analyzed. Both models agree well with experimental results for flat, rough, metallic coated metals. However, the semi-empirical model is substantially more accurate and more conservative than the theoretical model compared to the majority of experimental results for non-flat, rough, metallic coated metals.
- OSTI ID:
- 477369
- Report Number(s):
- CONF-961105--; ISBN 0-7918-1519-6
- Country of Publication:
- United States
- Language:
- English
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