A thermomechanical model for nominally flat, rough contacting surfaces coated with a metallic layer is developed. The model is shown to agree quite well with thermal test data obtained using nickel specimens, with one side of the contact coated with silver and the other side glass-bead blasted. In addition, it is demonstrated that a coated joint can be reduced to an equivalent bare joint by employing an effective hardness and an effective thermal conductivity. Using this technique, 61 coated test points were correlated, with an RMS difference of ± 12.6 percent between the data and a correlation which had previously been used only for bare contacts.
Enhancement of Thermal Contact Conductance by Metallic Coatings: Theory and Experiment
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Antonetti, V. W., and Yovanovich, M. M. (August 1, 1985). "Enhancement of Thermal Contact Conductance by Metallic Coatings: Theory and Experiment." ASME. J. Heat Transfer. August 1985; 107(3): 513–519. https://doi.org/10.1115/1.3247454
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