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Investigations on thermo-hydraulic performance due to flow-attack-angle in V-down rib with gap in a rectangular duct of solar air heater

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

Abstract

In this investigation, thermo-hydraulic performance of rectangular ducts roughened with a new configuration of ‘V-down rib having gap’ on one wide wall is determined. Small symmetrical gap equal to rib height is created at the centre of both legs of V of continuous V-down rib. The duct has aspect ratio (AR) of 12 and the Reynolds number (Re) ranged from 3000 to 15,000. To simulate the indoor testing of solar air heater, the roughened side of rectangular duct is heated with constant heat flux electric heater while the other sides are insulated. The roughness has relative roughness height of 0.043 and relative roughness pitch of 8. Five rib roughened plates having flow-attack-angle (α) from 30° to 75° have been tested. The thermo-hydraulic performance parameter based on equal pumping power (η), friction factor (f) and Nusselt number (Nu), were found to be highest for α=60°. The results obtained at α=60° were compared with those of continuous V-down rib for same rib-roughness parameters.

Suggested Citation

  • Singh, Sukhmeet & Chander, Subhash & Saini, J.S., 2012. "Investigations on thermo-hydraulic performance due to flow-attack-angle in V-down rib with gap in a rectangular duct of solar air heater," Applied Energy, Elsevier, vol. 97(C), pages 907-912.
    • Handle: RePEc:eee:appene:v:97:y:2012:i:c:p:907-912
    DOI: 10.1016/j.apenergy.2011.11.090
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    References listed on IDEAS

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    15. Nidhul, Kottayat & Kumar, Sachin & Yadav, Ajay Kumar & Anish, S., 2020. "Enhanced thermo-hydraulic performance in a V-ribbed triangular duct solar air heater: CFD and exergy analysis," Energy, Elsevier, vol. 200(C).
    16. Ma, Ting & Wang, Qiu-wang & Zeng, Min & Chen, Yi-tung & Liu, Yang & Nagarajan, Vijaisri, 2012. "Study on heat transfer and pressure drop performances of ribbed channel in the high temperature heat exchanger," Applied Energy, Elsevier, vol. 99(C), pages 393-401.
    17. Dezan, Daniel J. & Rocha, André D. & Ferreira, Wallace G., 2020. "Parametric sensitivity analysis and optimisation of a solar air heater with multiple rows of longitudinal vortex generators," Applied Energy, Elsevier, vol. 263(C).
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    20. Rajaseenivasan, T. & Srinivasan, S. & Srithar, K., 2015. "Comprehensive study on solar air heater with circular and V-type turbulators attached on absorber plate," Energy, Elsevier, vol. 88(C), pages 863-873.

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