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<p>Numerical analysis using Computational Fluid Dynamics was performed on a solar air heater featuring a square arc rib-fin absorber plate to assess the impact on thermo-hydraulic performance efficiency. The study focuses on the disruption of the laminar viscous layer, which is typically present in conventional design, by employing configurations of rib fin arrangements. The optimization was achieved by varying the relative roughness pitch (P/e) at values of 8, 10, and 12, alongside adjustments in hydraulic diameter ranging from 46.46&#xa0;mm to 55&#xa0;mm. The simulations were conducted for Reynolds numbers between 4000 and 16,000. The results showed an average 2.56-fold improvement in thermo-hydraulic performance efficiency was observed for configurations with a P/e of 8 and a hydraulic diameter of 55&#xa0;mm, compared to the base model. The study concludes that the square arc rib-fin arrangement enhances heat transfer by inducing eddy formations, which increases turbulence and thus improves thermal performance.</p> Graphical abstract <p></p>

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Novel effective design and enhanced thermal performance of stepwise square arc rib-fin solar air heaters: a numerical investigation

  • 期刊论文

  • 发表日期：

    2025年8月28日

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  • Amrit Shende,
  • Amrita Tripure,
  • Santosh Kumar Mishra,
  • Harish Kumar Ghritlahre

摘要

Numerical analysis using Computational Fluid Dynamics was performed on a solar air heater featuring a square arc rib-fin absorber plate to assess the impact on thermo-hydraulic performance efficiency. The study focuses on the disruption of the laminar viscous layer, which is typically present in conventional design, by employing configurations of rib fin arrangements. The optimization was achieved by varying the relative roughness pitch (P/e) at values of 8, 10, and 12, alongside adjustments in hydraulic diameter ranging from 46.46 mm to 55 mm. The simulations were conducted for Reynolds numbers between 4000 and 16,000. The results showed an average 2.56-fold improvement in thermo-hydraulic performance efficiency was observed for configurations with a P/e of 8 and a hydraulic diameter of 55 mm, compared to the base model. The study concludes that the square arc rib-fin arrangement enhances heat transfer by inducing eddy formations, which increases turbulence and thus improves thermal performance.

Graphical abstract