Thermal contact conductance between sliding rough surfaces
LIU Yuwei1,YE Fuhao2,LI Heyan3,WU Jianpeng4,SUN Nengxiang1
1. School of Mechanical Electronic & Information Engineering, China University of Mining and Technology,Beijing 100083, China;
2. Huawei Machine Co., Ltd., Dongguan 523808, China;
3. College of Urban Transportation and Logistics, Shenzhen Technology University, Shenzhen 518118, China;
4. School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
Abstract:Thermal contact conductance between contacting rough surfaces plays a significant role for the operational reliability and working life of machines. The effective thermal contact conductance between two rough sliding surfaces was analyzed and predicted, and a general equation applicable for the whole range of Peclet numbers was provided. The results reveal that at large Peclet number, the effective thermal conductance is not only dependent on the contact pressure, the thermo-physical properties of material and the surface roughness parameters, but also proportional to the square root of the sliding velocity. In addition, at low Peclet number, the thermal contact conductance and the contact pressure are approximately in a linear relation when the material properties and the asperity summit radii are given. These results provide guidances for the design of contact heat exchange.
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