Thermal contact conductance of various metals at elevated temperatures
Thermal contact conductance of various metals at elevated temperatures
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各种金属在高温下的接触热导
DOI：
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发表时间：
1989
期刊：
影响因子：
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通讯作者：
Richard Johnson
中科院分区：
文献类型：
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作者：
M. Skidmore;Richard Johnson
碳钢4130，不锈钢304和铝2041-T6的热接触电导的测量值给出了平均界面温度高达850°F和中等热流密度高达50,000 Btu/hr-ft?。所有的实验都是在空气中进行的。给出了4130碳钢在恒定条件下的热接触电导随表观压力的变化规律。结果表明，接触电导随压力的增大而增大，加载和卸载之间存在明显的滞后。在不进行表面修补的情况下，对同一试样进行重复实验，结果表明表面氧化物对试样的影响显著。在恒压下，碳钢4130、不锈钢304和铝2041-T6的热接触电导是温度的函数。在较高温度下的接触电导值。对于碳钢，在温度高于550°F时增加，而对于铝，温度高于200°F时增加明显。对于铝和不锈钢来说，在高温下材料蠕变似乎都有影响。初步计算表明，在测试的温度范围内，接触电导的变化是由于热学和性质的变化，而不是由于辐射。结果显示急剧上升
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