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Nusselt number and friction characteristics of solar air heater roughened with novel twisted V-shaped staggered ribs using liquid crystal thermography

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  • Kumar, Dheeraj
  • Layek, Apurba

Abstract

The objective of this study is to investigate the Nusselt number and friction characteristics of rectangular channel solar air heater (SAH) ducts roughened with staggered V-shaped ribs using the liquid crystal thermography technique. Experimentation is performed for Reynolds numbers ranges from 3000 to 21000, relative roughness pitch (P/e) of 7–11, relative roughness length (S/e) of 6.15–10.26, relative staggered distance (d/e) between 2 and 6, and fixed angle of attack (α) and relative twist length (y/e). The change in temperature of the roughened absorber surface that produced the RGB (red, green, blue) colour pattern is acquired by a charge-coupled device and converted into (Hue, Saturation, and Intensity) HSI using MATLAB. For all the varied parameters, results are discussed in terms of Nusselt number, friction factor, thermal enhancement factor, and visualization of fluid flows. Results show that the maximum augmentation ratio in Nusselt number and friction factor is 3.43 and 2.57 times more than that of a smooth duct, respectively. Among the varied roughness parameter, a maximum TEP value of 2.69 is noticed with P/e of 9, d/e of 4, and S/e of 6.15. It is concluded that inclusion of staggered twisted V-shaped ribs helps in enhancing heat transfer with the least amount of friction penalty.

Suggested Citation

  • Kumar, Dheeraj & Layek, Apurba, 2022. "Nusselt number and friction characteristics of solar air heater roughened with novel twisted V-shaped staggered ribs using liquid crystal thermography," Renewable Energy, Elsevier, vol. 201(P1), pages 651-666.
    • Handle: RePEc:eee:renene:v:201:y:2022:i:p1:p:651-666
    DOI: 10.1016/j.renene.2022.11.007
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    References listed on IDEAS

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    1. Bhuvad, Sushant Suresh & Azad, Rajnish & Lanjewar, Atul, 2022. "Thermal performance analysis of apex-up discrete arc ribs solar air heater-an experimental study," Renewable Energy, Elsevier, vol. 185(C), pages 403-415.
    2. Haldar, Ankur & Varshney, L. & Verma, Prashant, 2022. "Effect of roughness parameters on performance of solar air heater having artificial wavy roughness using CFD," Renewable Energy, Elsevier, vol. 184(C), pages 266-279.
    3. Deo, Narinderpal Singh & Chander, Subhash & Saini, J.S., 2016. "Performance analysis of solar air heater duct roughened with multigap V-down ribs combined with staggered ribs," Renewable Energy, Elsevier, vol. 91(C), pages 484-500.
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    Cited by:

    1. Rawal Diganjit & Nagaranjan Gnanasekaran & Moghtada Mobedi, 2023. "Thermohydraulic Efficiency of a Solar Air Heater in the Presence of Graded Aluminium Wire Mesh—A Combined Experimental–Numerical Study," Energies, MDPI, vol. 16(15), pages 1-32, July.
    2. Kumar, Rajneesh, 2024. "Improved solar-thermal heat exchanger for space heating with surface roughness: A numerical parametric investigation and its optimization," Renewable Energy, Elsevier, vol. 226(C).

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