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Experimental Investigation of Pressure on the Thermal Conductivity of Granular Carbon Aerogels

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Abstract

The thermal conductivity of granular carbon aerogels was measured using the transient hot-strip method under different pressure conditions through the design and construction of a high-pressure chamber and a vacuum chamber to provide a pressure environment ranging from 10−2 Pa to 30 MPa. The microstructure and specific surface area of the material were characterized through the cryogenic nitrogen adsorption method and scanning electron microscope images. Analysis of the experimental results showed that the thermal conductivity of the granular sample reached a constant when the pressure was less than 100 Pa, and the thermal conductivity of the sample showed a similar change trend (i.e., increased with pressure) under two different gas atmospheres. When the pressure was higher than 1000 Pa, the thermal conductivity increased significantly and the high rate of change continued until the pressure increased to 5 MPa, at which point the increase in thermal conductivity slowed.

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Acknowledgments

This research was financially supported by the National Natural Science Foundation of China (Nos. 51776066 and 51806064), the Fundamental Research Funds for the Central Universities (No. 2018ZD04), and the International Clean Energy Talent Program (iCET2018) supported by China Scholarship Council.

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Authors and Affiliations

  1. School of Energy, Power and Mechanical Engineering, Key Laboratory of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education, North China Electric Power University, Beijing, 102206, China

    Gaosheng Wei, Chao Huang, Zhen Zhou, Liu Cui & Xiaoze Du

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  1. Gaosheng Wei
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  2. Chao Huang
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  3. Zhen Zhou
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  5. Xiaoze Du
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Correspondence to Gaosheng Wei.

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Wei, G., Huang, C., Zhou, Z. et al. Experimental Investigation of Pressure on the Thermal Conductivity of Granular Carbon Aerogels. Int J Thermophys 40, 57 (2019). https://doi.org/10.1007/s10765-019-2522-4

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