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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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    1. 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.
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    8. Kumar, Anil & Saini, R.P. & Saini, J.S., 2013. "Development of correlations for Nusselt number and friction factor for solar air heater with roughened duct having multi v-shaped with gap rib as artificial roughness," Renewable Energy, Elsevier, vol. 58(C), pages 151-163.
    9. Bhagoria, J.L & Saini, J.S & Solanki, S.C, 2002. "Heat transfer coefficient and friction factor correlations for rectangular solar air heater duct having transverse wedge shaped rib roughness on the absorber plate," Renewable Energy, Elsevier, vol. 25(3), pages 341-369.
    10. 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.
    11. 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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