Experimental Techniques for Thermal Contact Resistance Measurements

Abstract

A number of different experimental techniques have been used to determine the thermal resistance of materials in contact, depending upon specific test requirements. These techniques and associated experimental facilities are reviewed, including the traditional cut-bar vertical-column test facilities, and more specialized facilities and techniques for measurement of the thermal contact resistance of such configurations or contacts as bolted joints, periodically contacting surfaces, full and partial scale component models, and analog techniques.Experimental thermal contact resistance data are presented and compared for selected categories of materials in contact including similar metallic junctions, junctions with interstitial fluids or fillers, and metallic junctions with metallic and non-metallic surface coatings. These experimental results demonstrate that the characteristics of thermal contact resistance may be used to thermally enhance a junction between materials, or thermally isolate a junction, depending upon thermal design requirements.For the second thickness of sample material or coating, the equations are < « -2 < + |

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“…For unhighlighted periods, the experimental data yield average R t ″ values of 7.59 × 10 –4 , 7.70 × 10 –4 , and 7.64 × 10 –4 m 2 ·K/W with standard deviations of 4.20 × 10 –7 , 1.49 × 10 –6 , and 2.23 × 10 –6 m 2 ·K/W, respectively, for Subjects 1, 2, and 3. These values are typical for two solids in contact and correspond to a few tens of microns of air thickness.…”