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Heat transfer and friction factor correlations for a duct having dimple-shape artificial roughness for solar air heaters

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  • Saini, R.P.
  • Verma, Jitendra

Abstract

The heat transfer coefficient between the absorber plate and air can be considerably increased by using artificial roughness on the underside of the absorber plate of a solar air heater duct. Under the present work, an experimental study has been carried out to investigate the effect of roughness and operating parameters on heat transfer and friction factor in a roughened duct provided with dimple-shape roughness geometry. The investigation has covered the range of Reynolds number (Re) from 2000 to 12,000, relative roughness height (e/D) from 0.018 to 0.037 and relative pitch (p/e) from 8 to 12. Based on the experimental data, values of Nusselt number (Nu) and friction factor (fr) have been determined for different values of roughness and operating parameters. In order to determine the enhancement in heat transfer and increment in friction factor values of Nusselt number and friction factor have been compared with those of smooth duct under similar flow conditions. Correlations for Nusselt number and friction factor have been developed for solar air heater duct provided such artificial roughness geometry.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:energy:v:33:y:2008:i:8:p:1277-1287
    DOI: 10.1016/j.energy.2008.02.017
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    References listed on IDEAS

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    1. Mittal, M.K. & Varun, & Saini, R.P. & Singal, S.K., 2007. "Effective efficiency of solar air heaters having different types of roughness elements on the absorber plate," Energy, Elsevier, vol. 32(5), pages 739-745.
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    3. Chaube, Alok & Sahoo, P.K. & Solanki, S.C., 2006. "Analysis of heat transfer augmentation and flow characteristics due to rib roughness over absorber plate of a solar air heater," Renewable Energy, Elsevier, vol. 31(3), pages 317-331.
    4. Prasad, K. & Mullick, S. C., 1983. "Heat transfer characteristics of a solar air heater used for drying purposes," Applied Energy, Elsevier, vol. 13(2), pages 83-93, February.
    5. 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.
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