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CFD (computational fluid dynamics) investigation on Nusselt number and friction factor of solar air heater duct roughened with non-uniform cross-section transverse rib

Author

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  • Singh, Sukhmeet
  • Singh, Bikramjit
  • Hans, V.S.
  • Gill, R.S.

Abstract

A 3-dimensional CFD (computational fluid dynamics) investigation has been carried out to study the heat transfer and friction characteristics of solar air heater duct roughened with periodic transverse rib. The selected rib roughness is a new concept; it has non-uniform cross-section in the form of saw-tooth. For comparison, transverse ribs with uniform cross-section of circular, square and trapezoidal have also been investigated. The Nusselt number and friction factor have been determined for Reynolds number range of 3000–15,000. The k-ε turbulence model was selected for analysis. The non-uniform cross-section saw-tooth rib was found to result in higher Nusselt number than uniform cross-section ribs for Reynolds number above 7000 due to reduced low heat transfer area downstream of the rib caused by disruption in re-circulations. The maximum enhancement in Nusselt number for duct roughened with saw-tooth rib and trapezoidal rib was 1.78 and 1.50 respectively. The friction factor was found to be lower for saw-tooth rib as compared to uniform cross-section ribs investigated. The maximum enhancement in friction factor for duct roughened with saw-tooth and trapezoidal rib was 2.49 and 3.58 respectively.

Suggested Citation

  • Singh, Sukhmeet & Singh, Bikramjit & Hans, V.S. & Gill, R.S., 2015. "CFD (computational fluid dynamics) investigation on Nusselt number and friction factor of solar air heater duct roughened with non-uniform cross-section transverse rib," Energy, Elsevier, vol. 84(C), pages 509-517.
  • Handle: RePEc:eee:energy:v:84:y:2015:i:c:p:509-517
    DOI: 10.1016/j.energy.2015.03.015
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    References listed on IDEAS

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    9. Singh, Sukhmeet & Chander, Subhash & Saini, J.S., 2011. "Heat transfer and friction factor correlations of solar air heater ducts artificially roughened with discrete V-down ribs," Energy, Elsevier, vol. 36(8), pages 5053-5064.
    10. Yadav, Anil Singh & Bhagoria, J.L., 2013. "A CFD (computational fluid dynamics) based heat transfer and fluid flow analysis of a solar air heater provided with circular transverse wire rib roughness on the absorber plate," Energy, Elsevier, vol. 55(C), pages 1127-1142.
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    Citations

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    Cited by:

    1. Hilo, Ali Kareem & Abu Talib, Abd Rahim & Acosta Iborra, Antonio & Hameed Sultan, Mohammed Thariq & Abdul Hamid, Mohd Faisal, 2020. "Effect of corrugated wall combined with backward-facing step channel on fluid flow and heat transfer," Energy, Elsevier, vol. 190(C).
    2. Jin, Dongxu & Quan, Shenglin & Zuo, Jianguo & Xu, Shiming, 2019. "Numerical investigation of heat transfer enhancement in a solar air heater roughened by multiple V-shaped ribs," Renewable Energy, Elsevier, vol. 134(C), pages 78-88.
    3. Alam, Tabish & Kim, Man-Hoe, 2018. "A comprehensive review on single phase heat transfer enhancement techniques in heat exchanger applications," Renewable and Sustainable Energy Reviews, Elsevier, vol. 81(P1), pages 813-839.
    4. Varun Kumar B. & G. Manikandan & P. Rajesh Kanna & Dawid Taler & Jan Taler & Marzena Nowak-Ocłoń & Karol Mzyk & Hoong Thiam Toh, 2018. "A Performance Evaluation of a Solar Air Heater Using Different Shaped Ribs Mounted on the Absorber Plate—A Review," Energies, MDPI, Open Access Journal, vol. 11(11), pages 1-20, November.
    5. Singh, Amritpal & Singh, Sukhmeet, 2017. "CFD investigation on roughness pitch variation in non-uniform cross-section transverse rib roughness on Nusselt number and friction factor characteristics of solar air heater duct," Energy, Elsevier, vol. 128(C), pages 109-127.
    6. Jin, Dongxu & Zhang, Manman & Wang, Ping & Xu, Shasha, 2015. "Numerical investigation of heat transfer and fluid flow in a solar air heater duct with multi V-shaped ribs on the absorber plate," Energy, Elsevier, vol. 89(C), pages 178-190.
    7. Kumar, Rajneesh & Goel, Varun & Kumar, Anoop, 2018. "Investigation of heat transfer augmentation and friction factor in triangular duct solar air heater due to forward facing chamfered rectangular ribs: A CFD based analysis," Renewable Energy, Elsevier, vol. 115(C), pages 824-835.
    8. 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.
    9. Hwi-Ung Choi & Kwang-Hwan Choi, 2020. "CFD Analysis on the Heat Transfer and Fluid Flow of Solar Air Heater having Transverse Triangular Block at the Bottom of Air Duct," Energies, MDPI, Open Access Journal, vol. 13(5), pages 1-19, March.
    10. Gill, R.S. & Hans, V.S. & Saini, J.S. & Singh, Sukhmeet, 2017. "Investigation on performance enhancement due to staggered piece in a broken arc rib roughened solar air heater duct," Renewable Energy, Elsevier, vol. 104(C), pages 148-162.
    11. Alam, Tabish & Kim, Man-Hoe, 2016. "Numerical study on thermal hydraulic performance improvement in solar air heater duct with semi ellipse shaped obstacles," Energy, Elsevier, vol. 112(C), pages 588-598.
    12. Anil Kumar & Man-Hoe Kim, 2016. "CFD Analysis on the Thermal Hydraulic Performance of an SAH Duct with Multi V-Shape Roughened Ribs," Energies, MDPI, Open Access Journal, vol. 9(6), pages 1-23, May.

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