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Extraction of thermal contact conductance of metal–metal contacts from scale-resolved direct numerical simulation.pdf

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Extraction of thermal contact conductance of metal–metal contacts from scale-resolved direct numerical simulation.pdf

International Journal of Heat and Mass Transfer 94 (2016) 164–173 Contents lists available at ScienceDirect International Journal of Heat and Mass Transfer journal homepage: /locate/ijhmt Extraction of thermal contact conductance of metal–metal contacts from scale-resolved direct numerical simulation Navni N. Verma, Sandip Mazumder ? Department of Mechanical and Aerospace Engineering, The Ohio State University, Columbus, OH 43210, USA article info Article history: Received 30 July 2015 Accepted 9 November 2015 Available online 7 December 2015 Keywords: Thermal contact resistance Thermal contact conductance Interface TCC Scale-resolved Numerical abstract The thermal contact conductance (TCC) between two conforming metallic rough surfaces was extracted from scale-resolved direct numerical simulation (DNS) of thermal transport across the interface. To compute thermal transport across the interface, microscale models of the interface geometry were created by stochastically reconstructing the topography of the two metallic surfaces, followed by generation of meshes that resolved all ?ne-scale features of the interface, including the air pockets. Steady state conjugate heat conduction computations were then conducted, and the TCC values were extracted and expressed as a function of the applied pressure (which translates into a mean separation distance) and the mean interface temperature. When compared with experimental data, the extracted TCC values were found to be in good agreement, thereby validating the approach. To lend practical value to the methodology and data presented in this paper, a relationship was also established between the extracted TCC and the number of contacts between the two surfaces. Further, it was shown that the number of contacts generated using surface reconstruction (numerically computed) correlates well with the theoretically calculated number of contacts using the joint probability distributions of the asperity heights on the two surfaces. The