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Correlation development for Nusselt number and friction factor of a multiple type V-pattern dimpled obstacles solar air passage

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  • Kumar, Anil
  • Kumar, Raj
  • Maithani, Rajesh
  • Chauhan, Ranchan
  • Sethi, Muneesh
  • Kumari, Anita
  • Kumar, Sushil
  • Kumar, Sunil

Abstract

This article presents the outcome of experimental study of Nusselt number (Nurs) and friction factors (frs) in a solar air passage with multiple type V-pattern dimpled obstacles. Investigation has been performed to examine the thermal and hydraulic data from a solar air passage with multiple type V-pattern dimpled obstacles on the heated wall. The Reynolds number (Re) base on the hydraulic diameter of the solar air passage varied from 5,000 to 17,000, relative dimpled obstacles width (Wc/Wd) varied from 1.0 to 6.0, ratio of dimpled depth to print diameter (ed/dd) from 0.50 to 2.0, relative dimpled pitch (Pb/ed) from 8.0 to 11.0, relative dimpled height (ed/Dh) of 0.037 and the angle of attack (αa) varied from 35° to 75°. The optimum data of thermal and hydraulic performance obtained at Wc/Wd=5.0, ed/db= 1.0, Pb/ed = 9.0, ed/Dh = 0.037 and αa = 55°. The current study shows that the thermal hydraulic performance of multiple type V-pattern dimpled obstacles pattern is around 7.0% higher as compared to other obstacles shapes solar air passage. Correlations of Nurs as well as frs are established in term of Re and geometrical parameters of multiple V-pattern dimpled obstacles solar air passage can be used to predict the values of Nurs and frs with considerably good accuracy.

Suggested Citation

  • Kumar, Anil & Kumar, Raj & Maithani, Rajesh & Chauhan, Ranchan & Sethi, Muneesh & Kumari, Anita & Kumar, Sushil & Kumar, Sunil, 2017. "Correlation development for Nusselt number and friction factor of a multiple type V-pattern dimpled obstacles solar air passage," Renewable Energy, Elsevier, vol. 109(C), pages 461-479.
    • Handle: RePEc:eee:renene:v:109:y:2017:i:c:p:461-479
    DOI: 10.1016/j.renene.2017.03.030
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    References listed on IDEAS

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    Cited by:

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    2. Jin, Dongxu & Quan, Shenglin & Zuo, Jianguo & Xu, Shiming, 2019. "Numerical investigation of heat transfer enhancement in a solar air heater roughened by multiple V-shaped ribs," Renewable Energy, Elsevier, vol. 134(C), pages 78-88.
    3. Tarek Kh. Abdelkader & Qizhou Fan & Eid S. Gaballah & Shaowei Wang & Yanlin Zhang, 2020. "Energy and Exergy Analysis of a Flat-Plate Solar Air Heater Artificially Roughened and Coated with a Novel Solar Selective Coating," Energies, MDPI, vol. 13(4), pages 1-17, February.
    4. Salman, Mohammad & Park, Myeong Hyeon & Chauhan, Ranchan & Kim, Sung Chul, 2021. "Experimental analysis of single loop solar heat collector with jet impingement over indented dimples," Renewable Energy, Elsevier, vol. 169(C), pages 618-628.
    5. Singh Bisht, Vijay & Kumar Patil, Anil & Gupta, Anirudh, 2018. "Review and performance evaluation of roughened solar air heaters," Renewable and Sustainable Energy Reviews, Elsevier, vol. 81(P1), pages 954-977.
    6. Rashidi, Saman & Hormozi, Faramarz & Sundén, Bengt & Mahian, Omid, 2019. "Energy saving in thermal energy systems using dimpled surface technology – A review on mechanisms and applications," Applied Energy, Elsevier, vol. 250(C), pages 1491-1547.
    7. Şevik, Seyfi & Özdilli, Özgür & Abuşka, Mesut, 2022. "Experimental investigation of relative roughness height effect in solar air collector with convex dimples," Renewable Energy, Elsevier, vol. 194(C), pages 100-116.
    8. Kumar, Rajneesh & Sharma, Akshay & Goel, Varun & Sharma, Rajesh & Sethi, Muneesh & Tyagi, V.V., 2023. "An experimental investigation of new roughness patterns (dimples with alternative protrusions) for the performance enhancement of solar air heater," Renewable Energy, Elsevier, vol. 211(C), pages 964-974.

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