Journal of Mechanical Science and Technology

, Volume 26, Issue 9, pp 2949–2958 | Cite as

CFD analysis of fin tube heat exchanger with a pair of delta winglet vortex generators

  • Seong Won Hwang
  • Dong Hwan Kim
  • June Kee Min
  • Ji Hwan Jeong


Among tubular heat exchangers, fin-tube types are the most widely used in refrigeration and air-conditioning equipment. Efforts to enhance the performance of these heat exchangers included variations in the fin shape from a plain fin to a slit and louver type. In the context of heat transfer augmentation, the performance of vortex generators has also been investigated. Delta winglet vortex generators have recently attracted research interest, partly due to experimental data showing that their addition to fin-tube heat exchangers considerably reduces pressure loss at heat transfer capacity of nearly the same level. The efficiency of the delta winglet vortex generators widely varies depending on their size and shape, as well as the locations where they are implemented. In this paper, the flow field around delta winglet vortex generators in a common flow up arrangement was analyzed in terms of flow characteristics and heat transfer using computational fluid dynamics methods. Flow mixing due to vortices and delayed separation due to acceleration influence the overall fin performance. The fin with delta winglet vortex generators exhibited a pressure loss lower than that of a plain fin, and the heat transfer performance was enhanced at high air velocity or Reynolds number.


Fin-tube heat exchanger Plate and fin tube Delta winglet Vortex generators Flow separation 


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  1. [1]
    K. Chang and P. Long, An experimental study of the airside performance of slit fin-and-tube heat exchangers under dry and wet conditions, International Journal of Air-Conditioning and Refrigeration, 17(1) (2009) 7–14.Google Scholar
  2. [2]
    G. B. Schubauer and W. G. Spangenberg, Forced mixing in boundary layers, Journal of Fluid Mechanics, 8 (1960) 10–31.zbMATHCrossRefGoogle Scholar
  3. [3]
    M. Fiebig, Vortices, generators and heat transfer, Trans Institution of Chemical Engineers, 76: Part A (1998).Google Scholar
  4. [4]
    K. Torii, K. M. Kwak and K. Nishino, Heat transfer enhancement accompanying pressure-loss reduction with winglet-type vortex generators for fin-tube heat exchanger, International Journal of Heat and Mass Transfer, 45 (2002) 3795–3801.CrossRefGoogle Scholar
  5. [5]
    A. M. Jacobi and R. K. Shah, Heat transfer surface enhancement through the use of longitudinal vortices: A review of recent progress, Experimental Thermal and Fluid Science, 11 (1995) 295–309.CrossRefGoogle Scholar
  6. [6]
    M. Fiebig, A. Valencia and N. K. Mitra, Wing-type vortex generators for fin-and-tube heat exchangers, Experimental Thermal and Fluid Science, 7 (1993) 287–295.CrossRefGoogle Scholar
  7. [7]
    K. M. Kwak, K. Torii and K. Nishino, Heat transfer and pressure loss penalty for the number of tube rows of staggered finned-tube bundles with a single transverse row of winglets, International Journal of Heat and Mass Transfer, 46 (2003) 175–180.CrossRefGoogle Scholar
  8. [8]
    K. M. Kwak, K. Torii and K. Nishino, Simultaneous heat transfer enhancement and pressure loss reduction for finnedtube bundles with the first or two transverse rows of built-in winglets, Experimental Thermal and Fluid Science, 29 (2005) 625–632.CrossRefGoogle Scholar
  9. [9]
    A. Joardar and A. M. Jacobi, Heat transfer enhancement by winglet-type vortex generator arrays in compact plain-finandtube heat exchanger, International Journal of refrigeration, 31 (2008) 87–97.CrossRefGoogle Scholar
  10. [10]
    C. B. Allison and B. B. Dally, Effect of a delta-winglet vortex pair on the performance of a tube-fin heat exchanger, International Journal of Heat and Mass Transfer, 50 (2007) 5065–5072.zbMATHCrossRefGoogle Scholar
  11. [11]
    J. Min and W. Xu, Numerical prediction of the performances of the fins with punched delta winglets and the louver fins and their comparison, Journal of Enhanced Heat Transfer, 12(4) (2005) 357–371.CrossRefGoogle Scholar
  12. [12]
    B. R. Munson, D. F. Young and T. H. Okiishi, Fundamentals of fluid mechanics, 4th edition. Wiley (2002).Google Scholar
  13. [13]
    CD-adapco, Methodology manual, STAR-CD (2006).Google Scholar
  14. [14]
    F. P. Incropera, D. P. Dewitt, T. L. Bergman and A. S. Lavine, Introduction to heat transfer, 5th edition. Wiley (2007).Google Scholar
  15. [15]
    S. Kakac, H. Liu, Heat exchangers, CRC Press (1998).Google Scholar
  16. [16]
    K. J. Kim and P. A. Durbin, Observations of the frequencies in a sphere wake and drag increase by acoustic excitation. Physics of Fluids, 31 (1998) 3260–3265.CrossRefGoogle Scholar
  17. [17]
    C. C. Wang, K. Y. Chi and C. J. Chang, Heat transfer and friction characteristics of plain fin-and-tube heat exchangers, part II: Correlation. International Journal of Heat and Mass Transfer, 43 (2000) 2693–2700.CrossRefGoogle Scholar
  18. [18]
    R. K. Shah and K. London, Laminar flow forced convection in ducts, Academic Press, 1978.Google Scholar

Copyright information

© The Korean Society of Mechanical Engineers and Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • Seong Won Hwang
    • 1
  • Dong Hwan Kim
    • 1
  • June Kee Min
    • 2
  • Ji Hwan Jeong
    • 1
  1. 1.School of Mechanical EngineeringPusan National UniversityBusanKorea
  2. 2.Rolls-Royce University Technology CenterPusan National UniversityBusanKorea

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