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Enhancement of heat transfer in SAH with polygonal and trapezoidal shape of the rib using CFD

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  • Varun Kumar, B.
  • Manikandan, G.
  • Rajesh Kanna, P.

Abstract

A numerical investigation was carried out in Solar Air Heater (SAH) by implementing an artificial rough absorber plate for higher thermal performances. A polygonal transfer rib, the forward and backward trapezoidal rough ribs were nominated for simulation analysis using ANSYS, Fluent version 13.0. The Renormalization k-ε model was selected to predict the augmentation of Nusselt number (Nu), friction factor (ƒ) characterization and Thermo Hydraulic Performances (THP) for a proposed rib by varying relative roughness pitch P/e = [3.33–20] and relative roughness height e/D = [0.03–0.09]. Dittus Boelter and Blasius correlation were used for validating the smooth surface of Nu and ƒ besides compared with the rough surface to ascertain augmentation of heat transfer. The investigation reported on the performance of Nu and ƒ of the proposed rib at a Reynolds number ranges from 3800 to 18,000. The result reveals that the polygonal rib shape with relative roughness pitch P/e = 3.33 has produced higher Nu and gradual reduction of ƒ at Reynolds number 18000. It was found that THP has achieved a maximum of 1.89 in P/e = 10 & e/D = 0.06 at Reynolds number 15000 in the backward trapezoidal rib.

Suggested Citation

  • Varun Kumar, B. & Manikandan, G. & Rajesh Kanna, P., 2021. "Enhancement of heat transfer in SAH with polygonal and trapezoidal shape of the rib using CFD," Energy, Elsevier, vol. 234(C).
    • Handle: RePEc:eee:energy:v:234:y:2021:i:c:s036054422101402x
    DOI: 10.1016/j.energy.2021.121154
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    References listed on IDEAS

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    Cited by:

    1. B. Varun Kumar & P. Rajesh Kanna & G. Manikandan & Dawid Taler & Jan Taler & Tomasz Sobota & Marzena Nowak-Ocłoń, 2023. "Investigation of Thermo-Hydraulic Performances of Artificial Ribs Mounted in a Rectangular Duct," Energies, MDPI, vol. 16(11), pages 1-21, May.
    2. Zhang, Pu & Xia, Peng & Guo, Xueyan & Xie, Shaozhang & Ma, Wensheng, 2022. "A CFD-adjoint reverse design of transverse rib profile for enhancing thermo-hydraulic performance in the solar air heater," Renewable Energy, Elsevier, vol. 198(C), pages 587-601.
    3. Karmveer & Naveen Kumar Gupta & Tabish Alam & Raffaello Cozzolino & Gino Bella, 2022. "A Descriptive Review to Access the Most Suitable Rib’s Configuration of Roughness for the Maximum Performance of Solar Air Heater," Energies, MDPI, vol. 15(8), pages 1-46, April.
    4. Anil Singh Yadav & Tabish Alam & Gaurav Gupta & Rajiv Saxena & Naveen Kumar Gupta & K. Viswanath Allamraju & Rahul Kumar & Neeraj Sharma & Abhishek Sharma & Utkarsh Pandey & Yogesh Agrawal, 2022. "A Numerical Investigation of an Artificially Roughened Solar Air Heater," Energies, MDPI, vol. 15(21), pages 1-27, October.

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