Scholarlink

<p>Magnetic nanofluids have come to attention due to their special physical properties, but their poor thermophysical properties limit their generalized use in DASC. In this study, Fe<sub>2</sub>O<sub>3</sub>/graphene nanoparticles were obtained by attaching magnetic Fe<sub>2</sub>O<sub>3</sub> to graphene sheets with excellent thermophysical properties, which enhanced the thermophysical properties of magnetic nanofluids. The study first analyzed the effects of different reaction conditions on the structural composition of the nanoparticles as well as the thermophysical properties of the nanofluids, and then applied the Fe<sub>2</sub>O<sub>3</sub>/graphene nanofluids in a DASC simulator to analyze the photothermal conversion performance of the nanofluids. The results show that the saturation magnetization strength of the G3 sample reaches 47.47&#xa0;emu·g<sup>−1</sup>, and the thermal conductivity of the nanofluid after its preparation into a nanofluid reaches 0.642 W·m<sup>−1</sup>·K at 80&#xa0;°C, whereas the thermal conductivity of the base fluid is only 0.41 W·m<sup>−1</sup>·K. For the photothermal conversion performance, with the increase of the proportion of Fe<sub>2</sub>O<sub>3</sub>, the photothermal conversion efficiency shows a trend of increasing and then decreasing, and the highest value of its photothermal conversion efficiency appears in the G2 sample at 200&#xa0;ppm, reaching 58.21 %, which is 31.9 % higher than that of the base fluid.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Heat Transfer Performance Study of Magnetic Fe2O3/Graphene Nanofluid in DASC

  • 期刊论文

  • 发表日期：

    2025年3月20日

查看全文
  • Mengmeng Ma,
  • Shan Qing,
  • Xiaohui Zhang,
  • Mingci Hu,
  • Zhihui Jia

摘要

Magnetic nanofluids have come to attention due to their special physical properties, but their poor thermophysical properties limit their generalized use in DASC. In this study, Fe2O3/graphene nanoparticles were obtained by attaching magnetic Fe2O3 to graphene sheets with excellent thermophysical properties, which enhanced the thermophysical properties of magnetic nanofluids. The study first analyzed the effects of different reaction conditions on the structural composition of the nanoparticles as well as the thermophysical properties of the nanofluids, and then applied the Fe2O3/graphene nanofluids in a DASC simulator to analyze the photothermal conversion performance of the nanofluids. The results show that the saturation magnetization strength of the G3 sample reaches 47.47 emu·g−1, and the thermal conductivity of the nanofluid after its preparation into a nanofluid reaches 0.642 W·m−1·K at 80 °C, whereas the thermal conductivity of the base fluid is only 0.41 W·m−1·K. For the photothermal conversion performance, with the increase of the proportion of Fe2O3, the photothermal conversion efficiency shows a trend of increasing and then decreasing, and the highest value of its photothermal conversion efficiency appears in the G2 sample at 200 ppm, reaching 58.21 %, which is 31.9 % higher than that of the base fluid.