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Study on Enhanced Heat Transfer and Stability Characteristics of Al2O3–SiO2/Water Hybrid Nanofluids

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Abstract

Hybrid nanofluids have better thermal conductivity and heat transfer properties than common fluids and currently have good prospects for applications in enhanced geothermal development. In this paper, a convective heat transfer experimental platform was built independently to study the convective heat transfer capability of Al2O3–SiO2/water hybrid nanofluid. The effect of different parameters on the enhanced heat transfer capability of the hybrid nanofluid was investigated, and the stability of the hybrid nanofluid under flow heat transfer conditions was evaluated. The following research results were obtained. Compared to water and single nanofluid, Al2O3–SiO2/water hybrid nanofluid has better enhanced heat transfer capability. The coaxial casing with "outside in and inside out" is more energy-efficient compared with the U-shaped heat exchanger tube. For Al2O3–SiO2/water hybrid nanofluid, there was an optimal particle concentration and ratio to optimize the convective heat transfer capability: a particle concentration of 0.10 wt % and a particle ratio of 5:5. The heat extraction of the fluid was negatively correlated with the inlet temperature and positively correlated with the flow rate. However, after the flow rate was higher than a certain extent, the heat exchange energy efficiency dropped significantly. The stability of Al2O3–SiO2/water hybrid nanofluid was well maintained in the flow heat exchange process. And the higher the flow rate, the more stable the particles are. However, the enhancement effect of macroscopic flow on the particle suspension stability would be weakened by too high fluid temperature.

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Data Availability

The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.

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Funding

This study is supported by the National Natural Science Foundation of China (Grant No. 52074194).

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Authors and Affiliations

  1. The Institute of Technological Sciences, Wuhan University, Wuhan, 430072, China

    Yuxuan Huang, Jincheng Hu, Chaoyu Xu & Xiaochuan Wang

  2. School of Power and Mechanical Engineering, Wuhan University, Wuhan, 430072, China

    Yuxuan Huang, Jincheng Hu & Chaoyu Xu

  3. Hubei Key Laboratory of Waterjet Theory and New Technology, Wuhan University, Wuhan, 430072, China

    Yuxuan Huang, Jincheng Hu, Chaoyu Xu & Xiaochuan Wang

  4. Beijing Institute of Aeronautical Materials, AECC, Beijing, 100095, China

    Hongchao Li

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  1. Yuxuan Huang
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Contributions

All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by YH, HL and JH. The first draft of the manuscript was written by YX and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Xiaochuan Wang.

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Huang, Y., Li, H., Hu, J. et al. Study on Enhanced Heat Transfer and Stability Characteristics of Al2O3–SiO2/Water Hybrid Nanofluids. Int J Thermophys 44, 156 (2023). https://doi.org/10.1007/s10765-023-03262-7

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