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Effect of roughness parameters on performance of solar air heater having artificial wavy roughness using CFD

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  • Haldar, Ankur
  • Varshney, L.
  • Verma, Prashant

Abstract

The current study used Ansys FLUENT software to perform a computational fluid dynamics analysis of a solar air heater with artificial wavy roughness. Roughness elements were studied for twelve wavy surface configurations with rib heights (e) of 0.7 mm, 1 mm, and 1.4 mm and pitch (p) of 10, 15, 20, and 25 mm. A 2D computational domain is modelled and the involved differential equations are solved using a finite volume method. To solve the transport equations for turbulent flow and energy dissipation rate, the RNG k-ε turbulence model with enhanced wall function is employed. For a uniform heat flow of 1000 W/m2, the effect of roughness parameter on Nusselt number, friction factor, and thermo-hydraulic performance parameter (THPP) is investigated. On the basis of the THPP, the best geometric parameter values are found in the Reynolds Number (Re) range of 3800–18,000. At Re of 12,000, the optimal THPP is 1.96, which corresponds to a rib height of 0.7 mm and a pitch of 15 mm.

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  • Haldar, Ankur & Varshney, L. & Verma, Prashant, 2022. "Effect of roughness parameters on performance of solar air heater having artificial wavy roughness using CFD," Renewable Energy, Elsevier, vol. 184(C), pages 266-279.
    • Handle: RePEc:eee:renene:v:184:y:2022:i:c:p:266-279
    DOI: 10.1016/j.renene.2021.11.088
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    References listed on IDEAS

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    1. Gawande, Vipin B. & Dhoble, A.S. & Zodpe, D.B. & Chamoli, Sunil, 2016. "A review of CFD methodology used in literature for predicting thermo-hydraulic performance of a roughened solar air heater," Renewable and Sustainable Energy Reviews, Elsevier, vol. 54(C), pages 550-605.
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    Cited by:

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    2. Hwi-Ung Choi & Kwang-Am Moon & Seong-Bhin Kim & Kwang-Hwan Choi, 2023. "CFD Analysis of the Heat Transfer and Fluid Flow Characteristics Using the Rectangular Rib Attached to the Fin Surface in a Solar Air Heater," Sustainability, MDPI, vol. 15(6), pages 1-18, March.
    3. Prasad, Jay Shankar & Datta, Aparesh & Mondal, Sirshendu, 2024. "Flow and thermal behavior of solar air heater with grooved roughness," Renewable Energy, Elsevier, vol. 220(C).
    4. 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.
    5. Kumar, Dheeraj & Layek, Apurba, 2022. "Nusselt number and friction characteristics of solar air heater roughened with novel twisted V-shaped staggered ribs using liquid crystal thermography," Renewable Energy, Elsevier, vol. 201(P1), pages 651-666.

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