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Thermal enhancement by using grooves and ribs combined with delta-winglet vortex generator in a solar receiver heat exchanger

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  • Luo, Lei
  • Wen, Fengbo
  • Wang, Lei
  • Sundén, Bengt
  • Wang, Songtao

Abstract

A good heat transfer performance with moderate pressure drop penalty, as well as a high mixing effect contributes to the increase of a solar receiver thermal efficiency. In this study, delta-winglet vortex generators (DWVGs), and the combination of DWVGs and obstacles are numerically studied to reveal the effects on a solar receiver heat exchanger and the heat transfer, friction factor and mixing. The DWVGs are placed on the heated plate. Four different obstacles, i.e., perturbation triangular ribs, perturbation semi-cylinder ribs, triangular grooves and semi-cylinder grooves, are studied. The Reynolds number is ranging from 4000 to 40,000. Results of the flow field, heated plate Nu number, friction factor, temperature and turbulent kinetic energy (TKE) are included. A smooth channel with DWVGs is considered as the baseline. The results showed that the adoption of DWVGs induces pressure gradients on more than one direction and thus vortices are generated. The flow velocity is increased as the flow approaches the DWVGs. The perturbation semi-cylinder ribs provide the highest heat transfer augmentation as the vortex is disturbed by the smooth cylinder surface. The thermal performance indicates that the semi-cylinder grooves together with DWVGs provide the highest performance and also an augmented mixing effect is found.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:appene:v:183:y:2016:i:c:p:1317-1332
    DOI: 10.1016/j.apenergy.2016.09.077
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    References listed on IDEAS

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    Cited by:

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    2. Wang, Zhendong & Lü, Xiaoshu & Li, Qiang & Sun, Youhong & Wang, Yuan & Deng, Sunhua & Guo, Wei, 2020. "Downhole electric heater with high heating efficiency for oil shale exploitation based on a double-shell structure," Energy, Elsevier, vol. 211(C).
    3. Zhao, Xiaohuan & E, Jiaqiang & Zhang, Zhiqing & Chen, Jingwei & Liao, Gaoliang & Zhang, Feng & Leng, Erwei & Han, Dandan & Hu, Wenyu, 2020. "A review on heat enhancement in thermal energy conversion and management using Field Synergy Principle," Applied Energy, Elsevier, vol. 257(C).
    4. Varun Kumar B. & G. Manikandan & P. Rajesh Kanna & Dawid Taler & Jan Taler & Marzena Nowak-Ocłoń & Karol Mzyk & Hoong Thiam Toh, 2018. "A Performance Evaluation of a Solar Air Heater Using Different Shaped Ribs Mounted on the Absorber Plate—A Review," Energies, MDPI, vol. 11(11), pages 1-20, November.
    5. 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).
    6. 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).
    7. Rashidi, Saman & Kashefi, Mohammad Hossein & Kim, Kyung Chun & Samimi-Abianeh, Omid, 2019. "Potentials of porous materials for energy management in heat exchangers – A comprehensive review," Applied Energy, Elsevier, vol. 243(C), pages 206-232.
    8. 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.
    9. 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).
    10. Tang, Song-Zhen & Wang, Fei-Long & He, Ya-Ling & Yu, Yang & Tong, Zi-Xiang, 2019. "Parametric optimization of H-type finned tube with longitudinal vortex generators by response surface model and genetic algorithm," Applied Energy, Elsevier, vol. 239(C), pages 908-918.
    11. 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.

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