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Nusselt number and friction factor correlations of three sides concave dimple roughened solar air heater

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  • Kumar, Vikash

Abstract

Performance analysis of roughened solar air heater becomes hectic due to absence of statistical correlation for heat transfer and friction factor. For understanding flow behavior, researchers have developed statistical correlations for different roughness geometries. This paper presents the outcome of experimental investigations upon 1 & 3-sides concave dimple roughened ducts. The results are presented as variation in Nusselt number & friction factor with Reynolds number. The geometrical & flow parameters has been varied as relative dimple pitch (p/e), relative dimple height (e/Dh), relative dimple depth (e/d) & Reynolds number in the range of 8–15, 0.018–0.045, 1–2 & 2000–13500 respectively. Statistical correlations for Nusselt number and friction factor in terms of roughness and flow parameters were derived based on data collected from experiment. Optimized value of flow & roughness parameter yielding maximum performance is determined. The maximum enhancement in Nusselt number for varying relative dimple pitch, relative dimple height & relative dimple depth was respectively of the order of 2.6–3.55, 1.91 to 3.42, 3.09 to 3.94 times and that of friction factor was of the order of 1.62–2.79, 1.52 to 2.34 and 2.21 to 2.56 times over those of 1-side roughened ones.

Suggested Citation

  • Kumar, Vikash, 2019. "Nusselt number and friction factor correlations of three sides concave dimple roughened solar air heater," Renewable Energy, Elsevier, vol. 135(C), pages 355-377.
    • Handle: RePEc:eee:renene:v:135:y:2019:i:c:p:355-377
    DOI: 10.1016/j.renene.2018.12.002
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    References listed on IDEAS

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    1. Ravi, Ravi Kant & Saini, R.P., 2016. "Experimental investigation on performance of a double pass artificial roughened solar air heater duct having roughness elements of the combination of discrete multi V shaped and staggered ribs," Energy, Elsevier, vol. 116(P1), pages 507-516.
    2. Singh, Sukhmeet & Chander, Subhash & Saini, J.S., 2015. "Thermo-hydraulic performance due to relative roughness pitch in V-down rib with gap in solar air heater duct—Comparison with similar rib roughness geometries," Renewable and Sustainable Energy Reviews, Elsevier, vol. 43(C), pages 1159-1166.
    3. 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.
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    Cited by:

    1. Sivakandhan, C. & Arjunan, T.V. & Matheswaran, M.M., 2020. "Thermohydraulic performance enhancement of a new hybrid duct solar air heater with inclined rib roughness," Renewable Energy, Elsevier, vol. 147(P1), pages 2345-2357.
    2. Kumar, Rajneesh, 2024. "Impact of various cross-sectional flow passages on the performance of a solar-based thermal energy conversion system," Renewable Energy, Elsevier, vol. 234(C).
    3. Hosseinkhani, A. & Gandjalikhan Nassab, S.A., 2024. "Study of gas radiation effect on the performance of single-pass solar heaters with an air gap," Energy, Elsevier, vol. 294(C).
    4. Şevik, Seyfi & Özdilli, Özgür & Abuşka, Mesut, 2022. "Experimental investigation of relative roughness height effect in solar air collector with convex dimples," Renewable Energy, Elsevier, vol. 194(C), pages 100-116.
    5. Kumar, Rajneesh & Goel, Varun, 2021. "Unconventional solar air heater with triangular flow-passage: A CFD based comparative performance assessment of different cross-sectional rib-roughnesses," Renewable Energy, Elsevier, vol. 172(C), pages 1267-1278.
    6. Mgbemene, Chigbo & Jacobs, Ifeanyi & Okoani, Anthony & Ononiwu, Ndudim, 2022. "Experimental investigation on the performance of aluminium soda can solar air heater," Renewable Energy, Elsevier, vol. 195(C), pages 182-193.
    7. Kumar, Vikash & Murmu, Ramesh, 2021. "Experimental investigation for thermal performance of inclined spherical ball roughened solar air duct," Renewable Energy, Elsevier, vol. 172(C), pages 1365-1392.
    8. Chauhan, Ranchan & Kim, Sung Chul, 2019. "Effective efficiency distribution characteristics in protruded/dimpled-arc plate solar thermal collector," Renewable Energy, Elsevier, vol. 138(C), pages 955-963.
    9. Hassan, Ahmad Kamal & Muzaffarul Hasan, M. & Emran Khan, Mohammad, 2021. "Parametric investigation and correlation development for heat transfer and friction factor in multiple arc dimple roughened solar air duct," Renewable Energy, Elsevier, vol. 174(C), pages 403-425.
    10. Kumar, Vikash, 2021. "Experimental investigation of exergetic efficiency of 3 side concave dimple roughened absorbers," Energy, Elsevier, vol. 215(PB).
    11. Hari Krishna Mosuru & V. P. Chandramohan, 2025. "Numerical analysis of solar air collector with trapezoidal ribbed absorber plate of indirect solar dryer: estimation of performance parameters with proposed pitch for better performance," Environment, Development and Sustainability: A Multidisciplinary Approach to the Theory and Practice of Sustainable Development, Springer, vol. 27(3), pages 7115-7139, March.
    12. Arunkumar, H.S. & Kumar, Shiva & Karanth, K. Vasudeva, 2020. "Analysis of a solar air heater for augmented thermohydraulic performance using helicoidal spring shaped fins-A numerical study," Renewable Energy, Elsevier, vol. 160(C), pages 297-311.

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