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Heat transfer and friction factor correlations of solar air heater ducts artificially roughened with discrete V-down ribs

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  • Singh, Sukhmeet
  • Chander, Subhash
  • Saini, J.S.

Abstract

The heat and fluid flow characteristics of rectangular duct having its one broad wall heated and roughened with periodic ‘discrete V-down rib’ are experimentally investigated. Reynolds number (Re) has been varied from 3000–15000 with relative gap width (g/e) and relative gap position (d/w) range of 0.5–2.0 and 0.20–0.80 respectively. The respective variation in relative roughness pitch (P/e), angle of attack (α) and relative roughness height (e/Dh) have been 4–12, 30°–75° and 0.015–0.043. The effect of roughness parameters on Nusselt number (Nu) and friction factor (f) has been determined and the results obtained were compared with those of smooth duct. The maximum increase in Nu and f over that of smooth duct was 3.04 and 3.11 folds respectively. The rib parameters corresponding to maximum increase in Nu and f were d/w = 0.65, g/e = 1.0, P/e = 8.0, α = 60° and e/Dh = 0.043. Correlations for the Nu and f in terms of Re and rib parameters have been developed.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:energy:v:36:y:2011:i:8:p:5053-5064
    DOI: 10.1016/j.energy.2011.05.052
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    References listed on IDEAS

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    1. Lanjewar, Atul & Bhagoria, J.L. & Sarviya, R.M., 2011. "Heat transfer and friction in solar air heater duct with W-shaped rib roughness on absorber plate," Energy, Elsevier, vol. 36(7), pages 4531-4541.
    2. Hans, Vishavjeet Singh & Saini, R.P. & Saini, J.S., 2009. "Performance of artificially roughened solar air heaters--A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 13(8), pages 1854-1869, October.
    3. 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.
    4. Bhushan, Brij & Singh, Ranjit, 2010. "A review on methodology of artificial roughness used in duct of solar air heaters," Energy, Elsevier, vol. 35(1), pages 202-212.
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