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<p>As technology advances, compact design heat exchangers are becoming more efficient and sustainable, utilizing fins to increase surface contact. However, due to their limited heat transfer capabilities and uneven thermal expansion, they are not suitable for high processing temperatures. This experimental investigation focuses on enhancing the performance of a double-pipe heat exchanger by designing a trapezoidal fin and utilizing hybrid nanofluids. These nanofluids consist of a 50:50 ratio of alumina (Al<sub>2</sub>O<sub>3</sub>) and graphene nanoplatelets (GNP) at volume concentrations of 0.05%, 0.15%, and 0.20%. The flow rate is controlled between 5 and 9 LPM, and the processing temperature ranges from 25 to 100&#xa0;°C. The study evaluates the effect of hybrid nanofluid volume concentrations on the functional characteristics of the heat exchangers, both with and without the trapezoidal fin. Based on the results, the double-pipe heat exchanger with trapezoidal fins, operating at higher processing temperatures and a specified flow rate (9LPM) with the hybrid nanofluid at 0.2% volume concentration, showed enhancements of 33%, 34.6%, and 40.1% in the heat transfer coefficient, Nusselt number, and overall heat transfer, respectively, compared to a similar setup without nanofluid (using water/ethylene glycol as the base fluid). The integration of hybrid nanofluids with fins in the heat exchanger resulted in improved heat transfer while maintaining a balanced pressure drop.</p>

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Trapezoidal fin featured heat exchanger performance enriched by using alumina/GNP hybrid nanofluid: thermal characteristics study

  • 期刊论文

  • 发表日期：

    2025年1月31日

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  • R. Venkatesh,
  • Viyat Varun Upadhyay,
  • N. Naga Bhooshanam,
  • Vinayagam Mohanavel,
  • K. Karthik,
  • Manikandan Ayyar,
  • Manickam Ravichandran,
  • Manzoore Elahi M. Soudagar,
  • A. H. Seikh

摘要

As technology advances, compact design heat exchangers are becoming more efficient and sustainable, utilizing fins to increase surface contact. However, due to their limited heat transfer capabilities and uneven thermal expansion, they are not suitable for high processing temperatures. This experimental investigation focuses on enhancing the performance of a double-pipe heat exchanger by designing a trapezoidal fin and utilizing hybrid nanofluids. These nanofluids consist of a 50:50 ratio of alumina (Al2O3) and graphene nanoplatelets (GNP) at volume concentrations of 0.05%, 0.15%, and 0.20%. The flow rate is controlled between 5 and 9 LPM, and the processing temperature ranges from 25 to 100 °C. The study evaluates the effect of hybrid nanofluid volume concentrations on the functional characteristics of the heat exchangers, both with and without the trapezoidal fin. Based on the results, the double-pipe heat exchanger with trapezoidal fins, operating at higher processing temperatures and a specified flow rate (9LPM) with the hybrid nanofluid at 0.2% volume concentration, showed enhancements of 33%, 34.6%, and 40.1% in the heat transfer coefficient, Nusselt number, and overall heat transfer, respectively, compared to a similar setup without nanofluid (using water/ethylene glycol as the base fluid). The integration of hybrid nanofluids with fins in the heat exchanger resulted in improved heat transfer while maintaining a balanced pressure drop.