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<p>This study investigates the performance of a double-tube heat exchanger employing perforated twisted tape and aluminum oxide nanoparticles. Turbulent flow conditions, considered by Reynolds numbers fluctuating from 4800 to 7800, are examined. The perforated steel tape utilized measures 1000&#xa0;mm in length, and 16&#xa0;mm in width, with a twist ratio of 6.25. The impact of incorporating aluminum oxide nanofluid at volume concentrations of 0.1%, 0.2%, and 0.3% on heat exchanger efficiency is analyzed. The numerical model’s validity is established through a comparison of the numerical results with experimental data, demonstrating significant agreement. Findings show that both Nusselt number (Nu) and exergy efficiency enhance with the insertion of perforated twisted tape and utilization of nanofluid. The Nusselt number ratio ranges from 127 to 146% when employing only perforated twisted tape inserts. When combined with nanofluid volume concentrations of 0.1%, 0.2%, and 0.3%, the ratio increases to 146–162%, 155–168%, and 158–175%, respectively. The pressure drop ratios range from 176 to 186% for the case with only perforated twisted tape inserts. The ratio rises to 196–201% when paired with 0.3% nanofluid volume concentrations. The perforated twisted tape increases pressure drop via added surface area and flow obstruction, while Al<sub>2</sub>O<sub>3</sub>/water nanofluid raises viscosity, exacerbating friction forces. Numerical simulations reveal uniform temperature and pressure distribution in the plain tube, with increased turbulence and swirl flow using perforated twisted tape and nanofluids.</p>

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Enhancing heat transfer in a double-tube heat exchanger using perforated twisted tape and nanofluid

  • 期刊论文

  • 发表日期：

    2025年2月3日

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  • S. A. Marzouk,
  • Ahmad Aljabr,
  • Fahad Awjah Almehmadi,
  • Maisa A. Sharaf

摘要

This study investigates the performance of a double-tube heat exchanger employing perforated twisted tape and aluminum oxide nanoparticles. Turbulent flow conditions, considered by Reynolds numbers fluctuating from 4800 to 7800, are examined. The perforated steel tape utilized measures 1000 mm in length, and 16 mm in width, with a twist ratio of 6.25. The impact of incorporating aluminum oxide nanofluid at volume concentrations of 0.1%, 0.2%, and 0.3% on heat exchanger efficiency is analyzed. The numerical model’s validity is established through a comparison of the numerical results with experimental data, demonstrating significant agreement. Findings show that both Nusselt number (Nu) and exergy efficiency enhance with the insertion of perforated twisted tape and utilization of nanofluid. The Nusselt number ratio ranges from 127 to 146% when employing only perforated twisted tape inserts. When combined with nanofluid volume concentrations of 0.1%, 0.2%, and 0.3%, the ratio increases to 146–162%, 155–168%, and 158–175%, respectively. The pressure drop ratios range from 176 to 186% for the case with only perforated twisted tape inserts. The ratio rises to 196–201% when paired with 0.3% nanofluid volume concentrations. The perforated twisted tape increases pressure drop via added surface area and flow obstruction, while Al2O3/water nanofluid raises viscosity, exacerbating friction forces. Numerical simulations reveal uniform temperature and pressure distribution in the plain tube, with increased turbulence and swirl flow using perforated twisted tape and nanofluids.