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<p>Enhancing heat transfer in double-tube heat exchangers (DTHX) improves energy efficiency, reduces equipment size and cost, and minimizes operational expenses. Due to laminar sublayer formation, DTHXs face reduced efficiency, highlighting the need for turbulence-promoting procedures and further focused research. This work highlights the novelty of using sinusoidal inner tubes with multiple wave amplitudes in DTHX, demonstrating enhanced heat transfer, exergy efficiency, and thermal performance. A numerical study is applied to examine the effects of an inner tube with a sinusoidal surface on the DTHX performance. The corrugated tubes with three different wave amplitudes are investigated and compared with a plain tube. The DTHX performance is evaluated focusing on Nusselt number, friction factor, exergy efficiency, and thermal enhancement factor. The model is validated by comparing with previous experimental results. The results show that the wavy surface enhances the Nusselt number by 80% for a 5&#xa0;mm wave amplitude tube. The corrugated tube with 5&#xa0;mm wave amplitude reduces the friction factor by 20% compared to 3&#xa0;mm wave amplitude tube. Exergy efficiency is enhanced by 51% as the maximum heat transfer rate is obtained with the wavy surface tube. The thermal enhancement factor is enhanced by 29% with 5&#xa0;mm wave amplitude tube. The temperature and velocity contours confirm higher enhancement in the heat exchanger performance with the sinusoidal tubes compared with the plain tubes.</p>

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Performance enhancement of double tube heat exchangers with innovative tubes

  • 期刊论文

  • 发表日期：

    2026年1月28日

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  • Heba Alzaben,
  • S. A. Marzouk,
  • Ahmad Aljabr,
  • Saad Alshammari,
  • Maisa A. Sharaf

摘要

Enhancing heat transfer in double-tube heat exchangers (DTHX) improves energy efficiency, reduces equipment size and cost, and minimizes operational expenses. Due to laminar sublayer formation, DTHXs face reduced efficiency, highlighting the need for turbulence-promoting procedures and further focused research. This work highlights the novelty of using sinusoidal inner tubes with multiple wave amplitudes in DTHX, demonstrating enhanced heat transfer, exergy efficiency, and thermal performance. A numerical study is applied to examine the effects of an inner tube with a sinusoidal surface on the DTHX performance. The corrugated tubes with three different wave amplitudes are investigated and compared with a plain tube. The DTHX performance is evaluated focusing on Nusselt number, friction factor, exergy efficiency, and thermal enhancement factor. The model is validated by comparing with previous experimental results. The results show that the wavy surface enhances the Nusselt number by 80% for a 5 mm wave amplitude tube. The corrugated tube with 5 mm wave amplitude reduces the friction factor by 20% compared to 3 mm wave amplitude tube. Exergy efficiency is enhanced by 51% as the maximum heat transfer rate is obtained with the wavy surface tube. The thermal enhancement factor is enhanced by 29% with 5 mm wave amplitude tube. The temperature and velocity contours confirm higher enhancement in the heat exchanger performance with the sinusoidal tubes compared with the plain tubes.