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<p>This study investigates the synthesis, surface functionalization and thermal performance of Al<sub>2</sub>O<sub>3</sub> Nanofluids for evacuated tube heat pipe solar collector applications. Al<sub>2</sub>O<sub>3</sub> nanostructures were synthesized using a hydrothermal method and functionalized with EDTA and NTA to improve dispersion stability. Structural and optical analyses confirmed phase-pure γ- Al<sub>2</sub>O<sub>3</sub> with enhanced absorption and reduced bandgap for EDTA-functionalized samples. Nanofluids were prepared at 3% and 4% volume concentrations, and their thermophysical properties were evaluated. Experimental results showed that the 4% nanofluid achieved a maximum outlet temperature of 73&#xa0;°C and thermal efficiency of 55.24% compared to 61&#xa0;°C and 33% for distilled water.&#xa0;The 3% nanofluid showed intermediate performance with a thermal efficiency of 48%, compared with 42% efficiency obtained for distilled water. The enhanced performance is attributed to improved thermal conductivity, stability and interfacial heat transfer due to EDTA functionalization. The findings demonstrate the potential of surface-engineered Al<sub>2</sub>O<sub>3</sub> Nanofluids for high –efficiency solar thermal applications.</p>

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Surface functionalized Al2O3 nanofluids for enhanced thermal performance of evacuated tube heat pipe solar collectors

  • 期刊论文

  • 发表日期：

    2026年5月29日

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  • N. Jayanthi,
  • R. Suresh Kumar,
  • M. Mudhukrishnan

摘要

This study investigates the synthesis, surface functionalization and thermal performance of Al2O3 Nanofluids for evacuated tube heat pipe solar collector applications. Al2O3 nanostructures were synthesized using a hydrothermal method and functionalized with EDTA and NTA to improve dispersion stability. Structural and optical analyses confirmed phase-pure γ- Al2O3 with enhanced absorption and reduced bandgap for EDTA-functionalized samples. Nanofluids were prepared at 3% and 4% volume concentrations, and their thermophysical properties were evaluated. Experimental results showed that the 4% nanofluid achieved a maximum outlet temperature of 73 °C and thermal efficiency of 55.24% compared to 61 °C and 33% for distilled water. The 3% nanofluid showed intermediate performance with a thermal efficiency of 48%, compared with 42% efficiency obtained for distilled water. The enhanced performance is attributed to improved thermal conductivity, stability and interfacial heat transfer due to EDTA functionalization. The findings demonstrate the potential of surface-engineered Al2O3 Nanofluids for high –efficiency solar thermal applications.