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Investigation of Thermo-Hydraulic Performances of Artificial Ribs Mounted in a Rectangular Duct

Author

Listed:
  • B. Varun Kumar

    (Velammal College of Engineering and Technology, Madurai 625107, India)

  • P. Rajesh Kanna

    (CO 2 Research and Green Technologies Centre, Vellore Institute of Technology, Vellore 632014, India)

  • G. Manikandan

    (Velammal College of Engineering and Technology, Madurai 625107, India)

  • Dawid Taler

    (Department of Thermal Processes, Air Protection and Waste Management, Cracow University of Technology, 31-155 Cracow, Poland)

  • Jan Taler

    (Department of Energy, Cracow University of Technology, 31-864 Cracow, Poland)

  • Tomasz Sobota

    (Department of Thermal Processes, Air Protection and Waste Management, Cracow University of Technology, 31-155 Cracow, Poland)

  • Marzena Nowak-Ocłoń

    (Department of Energy, Cracow University of Technology, 31-864 Cracow, Poland)

Abstract

This research investigates the fluid flow characterization and thermohydraulic performances (THP) of rib surfaces, using computational and experimental methods. ANSYS computational fluid dynamics (CFD) software was used to predict and validate the findings in the experimental setup. Artificial rib surfaces, including polygonal and forward trapezoidal-shaped ribs, were placed in the absorber plate at different relative pitch distances (p/e) = 6.7, 10, 13.4 and relative height (e/d) = 20, and the mass flow rate of air (working fluid) varied at Reynolds numbers ranging from 2000 to 20,000. According to the validation results, the RNG renormalization k-ε model was selected for the investigation. The results show that strong turbulence occured closer to the wall surface and behind the rib surface, enhancing thermal performances due to the sharp edge shape of the rib. A polygonal rib with a pitch distance of p/e = 6.7 achieved a higher Nusselt number (Nu) and thermohydraulic performance of 2.95 at Re 4000. An empirical correlation between the Nusselt number (Nu) and friction factor ( f ) was developed using linear regression analysis and was compared with the predicted values. The comparison results show a close range of ±8% between the experimental and predicted values.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:11:p:4404-:d:1159424
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    References listed on IDEAS

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    1. Verma, S.K & Prasad, B.N, 2000. "Investigation for the optimal thermohydraulic performance of artificially roughened solar air heaters," Renewable Energy, Elsevier, vol. 20(1), pages 19-36.
    2. 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).
    3. Saini, R.P. & Verma, Jitendra, 2008. "Heat transfer and friction factor correlations for a duct having dimple-shape artificial roughness for solar air heaters," Energy, Elsevier, vol. 33(8), pages 1277-1287.
    4. Karwa, Rajendra & Solanki, S.C & Saini, J.S, 2001. "Thermo-hydraulic performance of solar air heaters having integral chamfered rib roughness on absorber plates," Energy, Elsevier, vol. 26(2), pages 161-176.
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