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<p>In this paper, thermo-hydraulic performance and entropy generation (EnG) of the teardrop-dimpled tube (DT) was computationally performed under turbulent flow conditions which Reynolds numbers (Re) ranging between 10,000 ≤ Re ≤ 50,000 using Fe<sub>3</sub>O<sub>4</sub>/H<sub>2</sub>O ferrofluid (FF) (0 ≤ <i>φ</i> ≤ 2.0). The analyses were carried out under constant heat flux conditions of 20 kW/m<sup>2</sup>. Three sizes and spacing (<i>P</i> = 30, 40, and 50 mm) of the teardrop dimples were investigated parametrically. Moreover, in this study thermo-hydraulic performance and EnG effects were scrutinized for smooth and nine different teardrop DT cases. As a result of the simulations and calculations, the highest performance evaluation criterion (PEC) has been recorded in the case of DT9, and this case performed an increment of 28% at Re = 10,000 compared to the smooth tube (ST). Furthermore, the results showed that the case of DT9 enhanced the heat transfer rate with 38% at Re = 10,000. Considering the results of the second law of thermodynamics, the best total EnG was computed around 31% for DT9 at the Re = 10,000 and <i>φ</i> = 2.0% compared to a ST using H<sub>2</sub>O as a working fluid. Finally, the deploying of teardrop in the ST has been more effective than the utilization of nanofluids (NFs) compared ST.</p>

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Heat transfer and entropy analysis of Fe3O4/H2O ferrofluid in teardrop-dimpled circular tubes

  • 期刊论文

  • 发表日期：

    2025年11月3日

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  • Abdullah Dağdeviren,
  • Emrehan Gürsoy,
  • Engin Gedik,
  • Kamil Arslan

摘要

In this paper, thermo-hydraulic performance and entropy generation (EnG) of the teardrop-dimpled tube (DT) was computationally performed under turbulent flow conditions which Reynolds numbers (Re) ranging between 10,000 ≤ Re ≤ 50,000 using Fe3O4/H2O ferrofluid (FF) (0 ≤ φ ≤ 2.0). The analyses were carried out under constant heat flux conditions of 20 kW/m2. Three sizes and spacing (P = 30, 40, and 50 mm) of the teardrop dimples were investigated parametrically. Moreover, in this study thermo-hydraulic performance and EnG effects were scrutinized for smooth and nine different teardrop DT cases. As a result of the simulations and calculations, the highest performance evaluation criterion (PEC) has been recorded in the case of DT9, and this case performed an increment of 28% at Re = 10,000 compared to the smooth tube (ST). Furthermore, the results showed that the case of DT9 enhanced the heat transfer rate with 38% at Re = 10,000. Considering the results of the second law of thermodynamics, the best total EnG was computed around 31% for DT9 at the Re = 10,000 and φ = 2.0% compared to a ST using H2O as a working fluid. Finally, the deploying of teardrop in the ST has been more effective than the utilization of nanofluids (NFs) compared ST.