Measurement Methods and Applications for Thermophysical Properties at Micro/nanoscales

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概要

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• The effect of thermal contact resistance (TCR) on the measurement of thermal properties of micro/nanowires is investigated using the changing length T type probe and the 3\omega-T type probe. For the junction established by two crossed platinum microwires, the TCR is found to decrease as temperature increases, which can be possibly explained by the plastic deformation of the microscopic contacts. The same value of thermal effusivity of the test wire is obtained in the presence of different interstitial materials, and the one with small thermal impedance will give a decrease in the temperature oscillation of the hot wire. Based on this fact, the thermal conductivity and thermal effusivity of individual carbon fibers heat treated at 2800 and 1000 °C are measured, and the calculated specific heat is found to decrease with increasing heat-treatment temperature and to approach the value of graphite.

• 2011-11-25

著者

• Zhang Xing

  Key Laboratory for Thermal Science and Power Engineering of Education Ministry, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China

• Wang Jianli

  Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, School of Mechanical Engineering, Southeast University, Nanjing 210096, China

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