Abstract
The interface heat conductance between non-conforming stainless steel and roughened beryllium disks of 1-inch diameter has been measured as a function of surface roughness, interstitial gas pressure, contact pressure and heat flux. Helium was used as the interstitial gas. Based on experimental findings, the interface conductance between non-conforming surfaces was found to be degraded by up to 32% relative to that between conforming surfaces due to the effects of differential thermal deformations. Whereas increasing the contact pressure was found to increase the interface conductance, increasing the surface roughness or decreasing the interstitial gas pressure was found to significantly decrease the interface conductance.
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