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3D numerical investigation of flow and heat transfer characteristics in smooth wavy fin-and-elliptical tube heat exchangers using new type vortex generators

Author

Listed:
  • Lotfi, Babak
  • Zeng, Min
  • Sundén, Bengt
  • Wang, Qiuwang

Abstract

3D computational analysis was performed to investigate heat transfer and pressure drop characteristics of flow in SWFET (Smooth Wavy Fin-and-Elliptical Tube) heat exchanger with four new VGs (vortex generators), RTW (rectangular trapezoidal winglet), ARW (angle rectangular winglet), CARW (curved angle rectangular winglet) and WW (Wheeler wishbone). The numerical model was well validated with the available experimental results. Numerical results illustrate that vortex generators can bring about further heat transfer enhancement through careful adjustment of the position with respect to the elliptical tube, type and attack angle of vortex generators. The influences of the geometrical factors including attack angles of the winglets (αVG = 15∘,30∘,45∘,60∘ and 75°) and width/length aspect ratio (w/l = 0.5,1.0) of the Wheeler wishbones on enhancing the heat transfer performance of a smooth wavy fin heat exchanger with a three-row staggered elliptical tube bundle are investigated. A parametric study on the winglet vortex generators indicated that for the small attack angle, CARW vortex generators gives better thermohydraulic performance under the present conditions. The best thermal performance with winglet VGs in larger attack angle, was obtained at RTW VGs arrangement. For the SWFET heat exchangers, the WW VGs with w/l = 0.5 provide the best heat transfer performance.

Suggested Citation

  • Lotfi, Babak & Zeng, Min & Sundén, Bengt & Wang, Qiuwang, 2014. "3D numerical investigation of flow and heat transfer characteristics in smooth wavy fin-and-elliptical tube heat exchangers using new type vortex generators," Energy, Elsevier, vol. 73(C), pages 233-257.
  • Handle: RePEc:eee:energy:v:73:y:2014:i:c:p:233-257
    DOI: 10.1016/j.energy.2014.06.016
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    References listed on IDEAS

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    1. Kotcioglu, Isak & Caliskan, Sinan & Cansiz, Ahmet & Baskaya, Senol, 2010. "Second law analysis and heat transfer in a cross-flow heat exchanger with a new winglet-type vortex generator," Energy, Elsevier, vol. 35(9), pages 3686-3695.
    2. Ge, T.S. & Dai, Y.J. & Wang, R.Z. & Peng, Z.Z., 2010. "Experimental comparison and analysis on silica gel and polymer coated fin-tube heat exchangers," Energy, Elsevier, vol. 35(7), pages 2893-2900.
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    Citations

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    Cited by:

    1. Mangrulkar, Chidanand K. & Dhoble, Ashwinkumar S. & Chamoli, Sunil & Gupta, Ashutosh & Gawande, Vipin B., 2019. "Recent advancement in heat transfer and fluid flow characteristics in cross flow heat exchangers," Renewable and Sustainable Energy Reviews, Elsevier, vol. 113(C), pages 1-1.
    2. Łopata, Stanisław & Ocłoń, Paweł, 2015. "Numerical study of the effect of fouling on local heat transfer conditions in a high-temperature fin-and-tube heat exchanger," Energy, Elsevier, vol. 92(P1), pages 100-116.
    3. Zhang, Pan & Ma, Ting & Li, Wei-Dong & Ma, Guang-Yu & Wang, Qiu-Wang, 2018. "Design and optimization of a novel high temperature heat exchanger for waste heat cascade recovery from exhaust flue gases," Energy, Elsevier, vol. 160(C), pages 3-18.
    4. Lei Chai & Savvas A. Tassou, 2018. "A Review of Airside Heat Transfer Augmentation with Vortex Generators on Heat Transfer Surface," Energies, MDPI, Open Access Journal, vol. 11(10), pages 1-45, October.
    5. Lotfi, Babak & Sundén, Bengt & Wang, Qiuwang, 2016. "An investigation of the thermo-hydraulic performance of the smooth wavy fin-and-elliptical tube heat exchangers utilizing new type vortex generators," Applied Energy, Elsevier, vol. 162(C), pages 1282-1302.
    6. Khoshvaght-Aliabadi, M. & Sartipzadeh, O. & Alizadeh, A., 2015. "An experimental study on vortex-generator insert with different arrangements of delta-winglets," Energy, Elsevier, vol. 82(C), pages 629-639.

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