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Effects of tapes with double-sided delta-winglets on heat and vortex characteristics

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  • Yakut, Kenan
  • Sahin, Bayram
  • Celik, Cafer
  • Alemdaroglu, Nihal
  • Kurnuc, Aslihan

Abstract

An experimental study was carried out for tapes with double-sided delta-winglets under different geometrical and flow parameters, including angles of attack (90°, 60° and 30°), winglet heights (8, 12 and 16 mm), pitch arrangements (25, 50 and 75 mm) and Reynolds numbers (3690, 10493 and 16906). By using the Taguchi experimental-design method, the optimum parameters of the turbulator were determined by obtaining the Nusselt number, friction factor, amplitude of fluctuation pressure of the vortices and the vortex-shedding frequency. First of all, each goal was optimized, separately. Then, all the goals were optimized together, considering the priority of the goals, and the optimum results were obtained at a Reynolds number of 16906, 25 mm pitch, 8 mm height of winglet and 30° angle of attack, so that vortex-shedding frequencies are maximised. For lower frequencies, optimum conditions occurred at a Reynolds number of 16906 for 75 mm pitch, 8 mm height of winglet and 60° angle of attack.

Suggested Citation

  • Yakut, Kenan & Sahin, Bayram & Celik, Cafer & Alemdaroglu, Nihal & Kurnuc, Aslihan, 2005. "Effects of tapes with double-sided delta-winglets on heat and vortex characteristics," Applied Energy, Elsevier, vol. 80(1), pages 77-95, January.
    • Handle: RePEc:eee:appene:v:80:y:2005:i:1:p:77-95
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    References listed on IDEAS

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    1. Yakut, Kenan & Sahin, Bayram, 2004. "Flow-induced vibration analysis of conical rings used for heat transfer enhancement in heat exchangers," Applied Energy, Elsevier, vol. 78(3), pages 273-288, July.
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    1. Zhao, X.B. & Tang, G.H. & Ma, X.W. & Jin, Y. & Tao, W.Q., 2014. "Numerical investigation of heat transfer and erosion characteristics for H-type finned oval tube with longitudinal vortex generators and dimples," Applied Energy, Elsevier, vol. 127(C), pages 93-104.
    2. Gawande, Vipin B. & Dhoble, A.S. & Zodpe, D.B., 2014. "Effect of roughness geometries on heat transfer enhancement in solar thermal systems – A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 32(C), pages 347-378.
    3. Sahin, Bayram & Yakut, Kenan & Kotcioglu, Isak & Celik, Cafer, 2005. "Optimum design parameters of a heat exchanger," Applied Energy, Elsevier, vol. 82(1), pages 90-106, September.
    4. Ahmed, H.E. & Mohammed, H.A. & Yusoff, M.Z., 2012. "An overview on heat transfer augmentation using vortex generators and nanofluids: Approaches and applications," Renewable and Sustainable Energy Reviews, Elsevier, vol. 16(8), pages 5951-5993.
    5. Chamoli, Sunil & Thakur, N.S. & Saini, J.S., 2012. "A review of turbulence promoters used in solar thermal systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 16(5), pages 3154-3175.
    6. Alam, Tabish & Kim, Man-Hoe, 2018. "A comprehensive review on single phase heat transfer enhancement techniques in heat exchanger applications," Renewable and Sustainable Energy Reviews, Elsevier, vol. 81(P1), pages 813-839.
    7. Ganapathy, T. & Murugesan, K. & Gakkhar, R.P., 2009. "Performance optimization of Jatropha biodiesel engine model using Taguchi approach," Applied Energy, Elsevier, vol. 86(11), pages 2476-2486, November.
    8. Kumar, Raj & Kumar, Anil & Chauhan, Ranchan & Maithani, Rajesh, 2018. "Comparative study of effect of various blockage arrangements on thermal hydraulic performance in a roughened air passage," Renewable and Sustainable Energy Reviews, Elsevier, vol. 81(P1), pages 447-463.
    9. Yakut, Kenan & Alemdaroglu, Nihal & Sahin, Bayram & Celik, Cafer, 2006. "Optimum design-parameters of a heat exchanger having hexagonal fins," Applied Energy, Elsevier, vol. 83(2), pages 82-98, February.

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