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<p>The alternate oval tube heat exchanger (AOTHe) showcases a groundbreaking approach in chemical processing, focusing on enhancing heat transfer efficiency while reducing pressure loss. This design is evaluated through a numerical analysis of hybrid nanofluids known for their exceptional thermal conductivity and stability. The AOTHe functions effectively within a Reynolds number spectrum of 200–2200, typical of industrial heat exchangers, highlighting the study’s relevance. The hybrid nanofluid is also kept at 35 ℃, 45&#xa0;℃ and 55 ℃. The&#xa0;concentrations of water-based Al<sub>2</sub>O<sub>3</sub> + CuO and Al<sub>2</sub>O<sub>3</sub> + MWCNT are used to create hybrid nanofluids: 0.01vol%, 0.02vol%, and 0.03vol%. The analysis indicates that transition length and inlet temperature significantly influence performance in a parallel flow system. The presence of secondary flows caused by oval tube axial vortices improves heat transfer efficiency. The results show that the overall heat transfer coefficient is higher with Al<sub>2</sub>O<sub>3</sub> + MWCNT hybrid nanofluids than with Al<sub>2</sub>O<sub>3</sub> + CuO hybrid nanofluids. Also, the heat transfer enhancement factor (<i>η</i><sub><i>hnf</i></sub>) is observed for Al<sub>2</sub>O<sub>3</sub> + CuO and Al<sub>2</sub>O<sub>3</sub> + MWCNTs, ranging from 1.68–2.09 and 1.79–2.92, respectively. Al<sub>2</sub>O<sub>3</sub> + CuO performs better at lower temperatures due to its metallic properties, while Al<sub>2</sub>O<sub>3</sub> + MWCNT exhibits superior performance due to its high aspect ratio and thermal conductivity.</p>

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Enhancement of heat transfer performance of water-based hybrid nanofluids in an alternate oval tube: a CFD approach

  • 期刊论文

  • 发表日期：

    2025年7月8日

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  • Venkata Ramana Menda,
  • G. Premkumar,
  • Ramu Garugubilli,
  • Ganapathi Sundarapalli,
  • Javed Syed

摘要

The alternate oval tube heat exchanger (AOTHe) showcases a groundbreaking approach in chemical processing, focusing on enhancing heat transfer efficiency while reducing pressure loss. This design is evaluated through a numerical analysis of hybrid nanofluids known for their exceptional thermal conductivity and stability. The AOTHe functions effectively within a Reynolds number spectrum of 200–2200, typical of industrial heat exchangers, highlighting the study’s relevance. The hybrid nanofluid is also kept at 35 ℃, 45 ℃ and 55 ℃. The concentrations of water-based Al2O3 + CuO and Al2O3 + MWCNT are used to create hybrid nanofluids: 0.01vol%, 0.02vol%, and 0.03vol%. The analysis indicates that transition length and inlet temperature significantly influence performance in a parallel flow system. The presence of secondary flows caused by oval tube axial vortices improves heat transfer efficiency. The results show that the overall heat transfer coefficient is higher with Al2O3 + MWCNT hybrid nanofluids than with Al2O3 + CuO hybrid nanofluids. Also, the heat transfer enhancement factor (ηhnf) is observed for Al2O3 + CuO and Al2O3 + MWCNTs, ranging from 1.68–2.09 and 1.79–2.92, respectively. Al2O3 + CuO performs better at lower temperatures due to its metallic properties, while Al2O3 + MWCNT exhibits superior performance due to its high aspect ratio and thermal conductivity.