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<p>This study presents a comprehensive numerical investigation of the coupled hydrothermal and entropy generation behavior in a parabolic trough solar collector equipped with novel vortex generators. The working fluid is a hybrid nanofluid composed of magnesium oxide and double-walled carbon nanotubes dispersed in Syltherm 800, modeled using the two-phase mixture approach. Simulations are performed for Reynolds numbers ranging from 14,000 to 56,000 and nanoparticle concentrations of 0–4%. Six identical vortex-generating plates are inserted inside the absorber tube at equal intervals, and three distinct arrangements are evaluated: In Arrangement A, all plates have identical orientation; in Arrangement B, plates 2, 4, and 6 are rotated by 90°; and in Arrangement C, they are rotated by 180°. The results indicate that Arrangement C with 4% nanoparticle loading delivers the most favorable performance, achieving a 70.03% increase in average Nusselt number, a 24.8% reduction in total entropy generation, and a maximum performance evaluation criterion of 1.866 at Reynolds number 14000. Although this configuration results in a pressure drop increase of up to 56.3%, overall thermodynamic advantage remains significant. These findings highlight the critical role of vortex generator orientation and hybrid nanofluid formulation in enhancing second-law efficiency and thermal–hydraulic performance in solar thermal systems.</p>

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Combined hydrothermal and entropy generation analysis in a parabolic trough collector using a hybrid nanofluid and bent-plate vortex generators: a two-phase mixture model approach

  • 期刊论文

  • 发表日期：

    2025年10月7日

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  • Rashid Khan,
  • Rassol Hamed Rasheed,
  • As’ad Alizadeh,
  • Abdellatif M. Sadeq,
  • Shaymaa Abed Hussein,
  • Narinderjit Singh Sawaran Singh,
  • Husam Rajab,
  • Khalil Hajlaoui

摘要

This study presents a comprehensive numerical investigation of the coupled hydrothermal and entropy generation behavior in a parabolic trough solar collector equipped with novel vortex generators. The working fluid is a hybrid nanofluid composed of magnesium oxide and double-walled carbon nanotubes dispersed in Syltherm 800, modeled using the two-phase mixture approach. Simulations are performed for Reynolds numbers ranging from 14,000 to 56,000 and nanoparticle concentrations of 0–4%. Six identical vortex-generating plates are inserted inside the absorber tube at equal intervals, and three distinct arrangements are evaluated: In Arrangement A, all plates have identical orientation; in Arrangement B, plates 2, 4, and 6 are rotated by 90°; and in Arrangement C, they are rotated by 180°. The results indicate that Arrangement C with 4% nanoparticle loading delivers the most favorable performance, achieving a 70.03% increase in average Nusselt number, a 24.8% reduction in total entropy generation, and a maximum performance evaluation criterion of 1.866 at Reynolds number 14000. Although this configuration results in a pressure drop increase of up to 56.3%, overall thermodynamic advantage remains significant. These findings highlight the critical role of vortex generator orientation and hybrid nanofluid formulation in enhancing second-law efficiency and thermal–hydraulic performance in solar thermal systems.