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Nusselt number and friction factor correlation of solar air heater having twisted-rib roughness on absorber plate

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  • Kumar, Anup
  • Layek, Apurba

Abstract

A study is carried out providing integrated roughness over absorber plate of solar air heater to improve its potential for heat transfer augmentation. A number of experiments are conducted with twisted roughness to pursuit test results for heat transfer augmentation along with friction factor phenomena. The experiments stand with a relevant range of flow parameters as Reynolds number from 3500 to 21000, and geometric parameters such as relative roughness pitch from 6 to 10, rib inclination angle domain from 30° to 90° and twist ratio from 3 to 7. Finally, the correlations are developed for the Nusselt number and the friction factor in terms of flow parameter and roughness geometries and compared with experimental results which are reasonable and eventually satisfactory. The enhancement of heat transfer as well as friction factor are obtained and compared with smooth conventional duct for the same flow circumstances. The results are analyzed to pursuit optimum condition of roughness parameters to achieve the best performance.

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  • Kumar, Anup & Layek, Apurba, 2019. "Nusselt number and friction factor correlation of solar air heater having twisted-rib roughness on absorber plate," Renewable Energy, Elsevier, vol. 130(C), pages 687-699.
    • Handle: RePEc:eee:renene:v:130:y:2019:i:c:p:687-699
    DOI: 10.1016/j.renene.2018.06.076
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    References listed on IDEAS

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    Cited by:

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    10. Karmveer & Naveen Kumar Gupta & Tabish Alam & Raffaello Cozzolino & Gino Bella, 2022. "A Descriptive Review to Access the Most Suitable Rib’s Configuration of Roughness for the Maximum Performance of Solar Air Heater," Energies, MDPI, vol. 15(8), pages 1-46, April.
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    13. Nidhul, Kottayat & Yadav, Ajay Kumar & Anish, S. & Kumar, Sachin, 2021. "Critical review of ribbed solar air heater and performance evaluation of various V-rib configuration," Renewable and Sustainable Energy Reviews, Elsevier, vol. 142(C).

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