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Thermal Conductivity Measurement of An Individual Carbon Fiber by Modified T-type Method

Author: GuMing
Tutor: ZhangXing
School: Tsinghua University
Course: Power Engineering and Engineering Thermophysics
Keywords: Carbon fiber Thermal conductivity T-shaped method 3w law The thermal contact resistance
CLC: TQ342.742
Type: Master's thesis
Year: 2009
Downloads: 79
Quote: 0
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Abstract


Carbon fiber material has a low density, high temperature, anti-corrosion and high thermal conductivity characteristics, has a broad application prospects in the field of aerospace, high-temperature heat. Directly measuring the thermal conductivity due to the single carbon fibers only about 10μm in diameter, more difficult. Based on recent years been widely used to measure the the filamentous thermal properties of steady-state \method, and accurate measurement of the thermal conductivity of single carbon fibers. \Lap of thermal contact resistance measurement in order to study the hotline and the fiber under test, under the premise does not change the point of contact, by continuously changing the length of the fiber under test, measurement Hotline average temperature rise towards measuring fiber length changes in response, and then at the same time to determine the thermal conductivity and lap at the point of contact thermal resistance of the fiber under test. Change the length of \The use of this method is the first measurement of the thermal contact resistance of the platinum known in the thermal conductivity, the emissivity of the surface of the copper filaments and bonding points for emissivity results obtained to verify the feasibility improved \and reasonable. 100 to 300K temperature measured thermal conductivity mesophase pitch-based carbon fiber. Measurement result does not consider the influence of radiation and contact thermal resistance significantly less than traditional \Variable-length \Therefore, this measuring principle, combined with a \The method by adjusting the hotline AC frequency, change the the lap point oscillation temperature in the area of ??influence of the fiber under test, and then get the thermal properties and the thermal contact resistance of the fiber under test. LabVIEW-based program designed virtual lock-in amplifier is used to measure both ends of the hotline 3w signal. Virtual system the measured platinum wire and the thermal conductivity of the polymer, in good agreement with the references to verify the feasibility and accuracy of the virtual system. 100 to 300K temperature measured with the new method the carbon fiber heat absorption coefficient increases with increasing temperature, the thermal contact resistance decreases with increasing temperature. And combined with the steady-state \The thermal conductivity of the measurement results and the variable length \Last analysis, the method of measurement uncertainty of less than 5% and less affected by the radiation heat transfer and ambient temperature fluctuations.

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CLC: > Industrial Technology > Chemical Industry > The chemical fiber industry > Synthetic fiber > Special fiber > Carbon fiber to maintain the fiber > Carbon fiber
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