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Investigation of heat transfer augmentation and friction factor in triangular duct solar air heater due to forward facing chamfered rectangular ribs: A CFD based analysis


  • Kumar, Rajneesh
  • Goel, Varun
  • Kumar, Anoop


The rib provided over absorber plate can improve the performance of solar air heater (SAH). The effect of forward chamfered ribbed absorber plate is studied in the present article. Two new roughness parameters named as rib aspect ratio (e/w) and rib chamfered height ratio (e′/e) has been defined and their influence on the performance of triangular duct SAH is simulated using commercial ANSYS software for fixed range of Reynolds number (Re) which varies from 4000 to 17000. The e/w, relative roughness height (e/D) and e′/e ranges from 0.24 to 1.5, 0.018 to 0.043 and 0 to 1.0, respectively. The ribbed side of duct is heated with constant heat flux of 1000 Wm-2. The three-dimensional model of SAH is developed for the analysis and results are simulated using finite volume approach. The numerical methodology is validated by comparing predicted results with the available results and a close match is seen between friction factor (f) and Nusselt number (Nu). A remarkable change in f and Nu value is observed by varying both Re and roughness parameters. The maximum increase in Nu is observed in case of e/w, e/D and e′/e value of 1.5, 0.043 and 0.75, respectively, at Re value of 17000 and it is of the order of 2.88. The maximum increase of friction penalty is seen in case of e/D value of 0.043 which is of the order of 3.52 times the without ribbed duct at Re value of 4000. With the help of numerically predicted results, a generalized correlation is developed for Nu and f.

Suggested Citation

  • Kumar, Rajneesh & Goel, Varun & Kumar, Anoop, 2018. "Investigation of heat transfer augmentation and friction factor in triangular duct solar air heater due to forward facing chamfered rectangular ribs: A CFD based analysis," Renewable Energy, Elsevier, vol. 115(C), pages 824-835.
  • Handle: RePEc:eee:renene:v:115:y:2018:i:c:p:824-835
    DOI: 10.1016/j.renene.2017.09.010

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    References listed on IDEAS

    1. Alam, Tabish & Kim, Man-Hoe, 2016. "Numerical study on thermal hydraulic performance improvement in solar air heater duct with semi ellipse shaped obstacles," Energy, Elsevier, vol. 112(C), pages 588-598.
    2. Kumar, Rajneesh & Varun, & Kumar, Anoop, 2016. "Thermal and fluid dynamic characteristics of flow through triangular cross-sectional duct: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 61(C), pages 123-140.
    3. Yadav, Anil Singh & Bhagoria, J.L., 2013. "Heat transfer and fluid flow analysis of solar air heater: A review of CFD approach," Renewable and Sustainable Energy Reviews, Elsevier, vol. 23(C), pages 60-79.
    4. Chaube, Alok & Sahoo, P.K. & Solanki, S.C., 2006. "Analysis of heat transfer augmentation and flow characteristics due to rib roughness over absorber plate of a solar air heater," Renewable Energy, Elsevier, vol. 31(3), pages 317-331.
    5. Bhushan, Brij & Singh, Ranjit, 2010. "A review on methodology of artificial roughness used in duct of solar air heaters," Energy, Elsevier, vol. 35(1), pages 202-212.
    6. 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:

    1. Sivakandhan, C. & Arjunan, T.V. & Matheswaran, M.M., 2020. "Thermohydraulic performance enhancement of a new hybrid duct solar air heater with inclined rib roughness," Renewable Energy, Elsevier, vol. 147(P1), pages 2345-2357.
    2. 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, Open Access Journal, vol. 11(11), pages 1-20, November.
    3. Das, Biplab & Mondol, Jayanta Deb & Debnath, Suman & Pugsley, Adrian & Smyth, Mervyn & Zacharopoulos, A., 2020. "Effect of the absorber surface roughness on the performance of a solar air collector: An experimental investigation," Renewable Energy, Elsevier, vol. 152(C), pages 567-578.
    4. 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.
    5. Afshari, Faraz & Sözen, Adnan & Khanlari, Ataollah & Tuncer, Azim Doğuş & Şirin, Ceylin, 2020. "Effect of turbulator modifications on the thermal performance of cost-effective alternative solar air heater," Renewable Energy, Elsevier, vol. 158(C), pages 297-310.
    6. 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).


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