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Study on Enhanced Heat Transfer and Stability Characteristics of Al2O3–SiO2/Water Hybrid Nanofluids
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Study on Enhanced Heat Transfer and Stability Characteristics of Al2O3–SiO2/Water Hybrid Nanofluids
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Journal Article
Study on Enhanced Heat Transfer and Stability Characteristics of Al2O3–SiO2/Water Hybrid Nanofluids
2023
Overview
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 Al
2
O
3
–SiO
2
/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, Al
2
O
3
–SiO
2
/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 Al
2
O
3
–SiO
2
/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 Al
2
O
3
–SiO
2
/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.
