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On the solar air heater thermal enhancement and flow topology using differently shaped ribs combined with delta-winglet vortex generators

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  • Zhao, Zhiqi
  • Luo, Lei
  • Qiu, Dandan
  • Wang, Zhongqi
  • Sundén, Bengt

Abstract

A numerical investigation has been conducted to study the convective heat transfer enhancement and friction loss behaviors for turbulent flow by using arrays of differently shaped ribs combined with delta-winglet vortex generators (DWVGs) pair on the absorber plate of a solar air heater. Four transverse vortex generators arrays, i.e., 90° continuous ribs, 90° truncated ribs, 60° V-shaped continuous ribs, and 60° V-shaped truncated ribs, are studied to investigate the mixing effect with the DWVGs pair. The aspect ratio (AR = Lv/Hv) of the DWVGs is 2:1 while the geometrical condition of the ribs is height of 0.003 m and pitch of 0.028 m. The Reynolds number ranges from 4000 to 20,000. Results of temperature, Nusselt number, vortical structure, topological portrait, turbulent kinetic energy (TKE), friction factor and thermal performance evaluation are included. The results show that the adoption of DWVGs and the shape type of the ribs have great impact on the heat transfer and flow structure in the solar air heater. It is found that the DWVGs combined with the 60° V-shaped continuous ribs contributes the best heat transfer performance, and the heat transfer is enhanced by 39.4% compared with the only DWVGs case.

Suggested Citation

  • Zhao, Zhiqi & Luo, Lei & Qiu, Dandan & Wang, Zhongqi & Sundén, Bengt, 2021. "On the solar air heater thermal enhancement and flow topology using differently shaped ribs combined with delta-winglet vortex generators," Energy, Elsevier, vol. 224(C).
    • Handle: RePEc:eee:energy:v:224:y:2021:i:c:s0360544221001936
    DOI: 10.1016/j.energy.2021.119944
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    References listed on IDEAS

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    1. Luo, Lei & Du, Wei & Wang, Songtao & Wang, Lei & Sundén, Bengt & Zhang, Xinhong, 2017. "Multi-objective optimization of a solar receiver considering both the dimple/protrusion depth and delta-winglet vortex generators," Energy, Elsevier, vol. 137(C), pages 1-19.
    2. Sahu, M.M. & Bhagoria, J.L., 2005. "Augmentation of heat transfer coefficient by using 90° broken transverse ribs on absorber plate of solar air heater," Renewable Energy, Elsevier, vol. 30(13), pages 2057-2073.
    3. Luo, Lei & Wen, Fengbo & Wang, Lei & Sundén, Bengt & Wang, Songtao, 2016. "Thermal enhancement by using grooves and ribs combined with delta-winglet vortex generator in a solar receiver heat exchanger," Applied Energy, Elsevier, vol. 183(C), pages 1317-1332.
    4. Singh, Sukhmeet & Singh, Bikramjit & Hans, V.S. & Gill, R.S., 2015. "CFD (computational fluid dynamics) investigation on Nusselt number and friction factor of solar air heater duct roughened with non-uniform cross-section transverse rib," Energy, Elsevier, vol. 84(C), pages 509-517.
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    Cited by:

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    2. Ravanbakhsh, Mohammad & Gholizadeh, Mohammad & Rezapour, Mojtaba, 2023. "3E thermodynamic modeling and optimization a novel of ARS-CPVT with the effect of inserting a turbulator in the solar collector," Renewable Energy, Elsevier, vol. 209(C), pages 591-607.
    3. 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.
    4. Al-Zahrani, Salman, 2023. "Thermal performance augmentation of solar air heater with curved path," Energy, Elsevier, vol. 284(C).

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