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Effect of chamfering on heat transfer and friction characteristics of solar air heater having absorber plate roughened with compound turbulators

Author

Listed:
  • Layek, Apurba
  • Saini, J.S.
  • Solanki, S.C.

Abstract

Artificial roughness in the form of repeated transverse chamfered rib-groove roughness on one broad wall has been proposed as a convenient method for enhancement of thermal performance of solar air heater. An experimental investigation on heat and fluid flow characteristics of fully developed turbulent flow in a rectangular duct having repeated integral transverse chamfered rib-groove roughness on one broad wall has been carried out. The roughened wall is uniformly heated while the remaining three walls are insulated. These boundary conditions correspond closely to those found in solar air heaters. Six roughened plates have been tested placing a 60° V-groove at the centre line in between two consecutive chamfered ribs. The ribs' top have been chamfered having chamfer angles of 5°, 12°, 15°, 18°, 22° and 30°, while relative roughness pitch (P/e) and relative roughness height (e/Dh) of the ribs were kept constant having values of 10 and 0.03 respectively. The flow Reynolds number of the duct varied in the range of approximately 3000–21,000, most suitable for solar air heater. The effects of chamfer angle on Nusselt number and friction factor have been discussed and the results are compared with the square rib-grooved and smooth duct under similar flow conditions to investigate the enhancement in Nusselt number and friction factor. The conditions for the maximum enhancement of Nusselt number and friction factor have been determined. It has been found that the thermo-hydraulic performance of the solar air heater provided with such roughness is considerably enhanced.

Suggested Citation

  • Layek, Apurba & Saini, J.S. & Solanki, S.C., 2009. "Effect of chamfering on heat transfer and friction characteristics of solar air heater having absorber plate roughened with compound turbulators," Renewable Energy, Elsevier, vol. 34(5), pages 1292-1298.
    • Handle: RePEc:eee:renene:v:34:y:2009:i:5:p:1292-1298
    DOI: 10.1016/j.renene.2008.09.016
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    Cited by:

    1. Kumar, Anup & Layek, Apurba, 2019. "Nusselt number and friction factor correlation of solar air heater having twisted-rib roughness on absorber plate," Renewable Energy, Elsevier, vol. 130(C), pages 687-699.
    2. Tabish Alam & Chandan Swaroop Meena & Nagesh Babu Balam & Ashok Kumar & Raffaello Cozzolino, 2021. "Thermo-Hydraulic Performance Characteristics and Optimization of Protrusion Rib Roughness in Solar Air Heater," Energies, MDPI, vol. 14(11), pages 1-19, May.
    3. Singh Yadav, Anil & Kumar Thapak, Manish, 2014. "Artificially roughened solar air heater: Experimental investigations," Renewable and Sustainable Energy Reviews, Elsevier, vol. 36(C), pages 370-411.
    4. Hamid, Mohammed O.A. & Zhang, Bo, 2015. "Field synergy analysis for turbulent heat transfer on ribs roughened solar air heater," Renewable Energy, Elsevier, vol. 83(C), pages 1007-1019.
    5. 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.
    6. Sharma, Sanjay K. & Kalamkar, Vilas R., 2015. "Thermo-hydraulic performance analysis of solar air heaters having artificial roughness–A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 41(C), pages 413-435.
    7. Oztop, Hakan F. & Bayrak, Fatih & Hepbasli, Arif, 2013. "Energetic and exergetic aspects of solar air heating (solar collector) systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 21(C), pages 59-83.

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