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<p>Single paraffin matrix has inferior thermal conductivity performances and low thermal storage efficiency. In this paper, the thermal storage performance of paraffin wax was improved by introducing high thermal conductivity carbon nanotubes with different diameters (8–12&#xa0;nm, 10–20&#xa0;nm, 20–40&#xa0;nm) and mass fractions (5 mass%, 7&#xa0;mass%). Different from traditional research, this study investigates the influence of the diameter and mass fraction of the carbon nanotubes on the heat transfer performances of paraffin composite phase change materials from a two-dimensional perspective (L-W and L-H directions), revealing the anisotropic heat transfer characteristics of the composites in different directions. The results showed that the composites with diameters of 8–12&#xa0;nm exhibited lower anisotropy in the L-W and L-H directions. When the mass fraction of carbon nanotubes was increased to 7%, the temperature distributions of the composites were more uniform in the L-W and L-H directions, and the temperature differences were reduced by 16.8–24.3% and 11.7–12.4%, respectively.</p>

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Analysis of the influence of carbon nanotube’s diameter and mass fraction on the anisotropic heat transfer characteristics of paraffin composites

  • 期刊论文

  • 发表日期：

    2026年4月3日

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  • Chen Sun,
  • Yafei Zhang,
  • Hua Chen

摘要

Single paraffin matrix has inferior thermal conductivity performances and low thermal storage efficiency. In this paper, the thermal storage performance of paraffin wax was improved by introducing high thermal conductivity carbon nanotubes with different diameters (8–12 nm, 10–20 nm, 20–40 nm) and mass fractions (5 mass%, 7 mass%). Different from traditional research, this study investigates the influence of the diameter and mass fraction of the carbon nanotubes on the heat transfer performances of paraffin composite phase change materials from a two-dimensional perspective (L-W and L-H directions), revealing the anisotropic heat transfer characteristics of the composites in different directions. The results showed that the composites with diameters of 8–12 nm exhibited lower anisotropy in the L-W and L-H directions. When the mass fraction of carbon nanotubes was increased to 7%, the temperature distributions of the composites were more uniform in the L-W and L-H directions, and the temperature differences were reduced by 16.8–24.3% and 11.7–12.4%, respectively.