Theoretical Analysis of Three-dimensional Nano-heat Transfer Arising at the Microcontact of Two Sliding Surfaces

• Main Authors: Jian-Wei Chen, 陳建維
• Other Authors: Jen-Fin Lin
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/96007163446544492442

碩士 === 國立成功大學 === 機械工程學系碩博士班 === 91 === In this study, we apply fractal theory to characterize and model the roughness of surface. We also apply non-Fourier’s law to consider the heat transfer effect of heat carrier. The temperature model of the three-dimensional nano-heat transfer is established and the frictional temperature rises at the microcontacts of two sliding surfaces are analyzed by fractal surfaces and temperature model. According to the analysis results, the average temperature rise of single asperity increase as fractal dimension, topothesy and non-dimensional separation distance increase. The difference of the Fourier’s law and non-Fourier’s law is not the temperature arising at the microcontacts, the difference of them is when heat transfer from top to bottom of the asperity. When the process of heat transport in very small distance or in very short time, heat will be transferred faster. The properties which effect temperature of material are thermal diffusivity and thermal conductivity. Temperature will increase as the ratio of thermal diffusivity and thermal conductivity increase. Other properties of material like hardness and Young’s modulus which has small influence of temperature.