Abstract
The measured values of thermal contact conductance far carbon steel 4130, stainless steel 304, and aluminum 2041-T6 are presented for mean interface temperatures up to 850°F snd moderate rates of heat flux up to 50,000 Btu/hr-ft?. All experiments were performed in air. The thermal contact conductance versus apparent pressure at constant is presented for carbon steel 4130. Results show a rising value of contact conductance with pPessure and a significant hysteresis between loading and unloading. Repeat experiments with the same specimens hut without surface refinishim suggest significant inlfuence of surface oxide. Thermal contact conductance as a function of temperature at constant pressure are presented for carbon steel 4130, stainless steel 304, and aluminum 2041-T6. value of contact conductance at higher temperatures. For carbon steel the increase occurs at temperatures greater than 550°F, while for aluminum the increase is evident for temperatures greater than 200°F . For both aluminum and stainless steel there appears to be an effect due to material creep at elevated temperatures. Elementary calculations suggest that the changes in contact conductance for the temperature range tested are due to thermal and property changes and not due to radiation. Results show a sharply rising
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