International Journal of Air-Conditioning and Refrigeration

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
권호 표지

Local and Overall Heat Transfer Characteristics of Fin- Flat Tube Heat Exchanger with Vortex Generators

  • Published : 2003.09.01
Download PDF
⟨ Previous Next ⟩

Abstract

Local and overall heat transfer characteristics of fin-flat tube heat exchangers with and without vortex generators were investigated. Local heat transfer coefficients were measured with the heat exchanger model using naphthalene sublimation technique. In case of a fin-flat tube heat exchanger without vortex generators, only the horseshoe vortices formed around tubes augment the heat transfer. On the other hand, longitudinal vortices created artificially by vortex generators additionally enhance heat transfer in case of a fin-flat tube heat exchanger with vortex generators. Overall heat transfer coefficients were measured with the prototypes of the fin-flat tube heat exchanger with and without vortex generators in a wind tunnel and results were compared with those of a fin-circular tube heat exchanger with wavy fin. Friction losses for heat exchangers were also measured and compared. The fin-flat tube heat exchanger with vortex generators is found to be more effective than the fin-circular tube heat exchanger with wavy fin.

Keywords

References

  1. Kays, W. M. and London, A. L., 1964, Compact Heat Exchangers, McGraw-Hill
  2. Tiggelbeck, S., Mitra, N. K. and Fiebig, M.,1994, Comparison of wing-type vortex generators for heat transfer enhancement in channel flows, J. of Heat Transfer, Vol. 116, pp. 880-885
  3. Biswas, G., Mitra, N. K. and Fiebig, M., 1994, Heat transfer enhancement in fin-tube heat exchangers by winglet type vortex generators, Int. J. of Heat Mass Transfer, Vol. 37, No. 2, pp. 283-294
  4. Fiebig, M. and Chen, Y., 1998, Heat transfer enhancement by wing-type longitudinal vortex generators and their application to finned oval tube heat exchanger elements, Proc. of the NATO Advanced Study Institute on Heat Transfer Enhancement of Heat Exchangers, pp. 79-105
  5. Zhu, J. X., Fiebig, M. and Mitra, N. K., 1995, Numerical investigation of turbulent flows and heat transfer in a rib-roughened channel with longitudinal vortex generators, Int. J. of Heat Mass Transfer, Vol. 38, No. 3, pp. 495-501
  6. Yoo, S. Y., 1997, Development of high efficiency fin-flat tube heat exchanger using vortex generators, MOTI Report, 95-P-10-2
  7. Kang, H. C., Kim, M. H. and Kim, M. S., 2000, A study on the thermal characteristics of finned-tube heat exchanger by using the liquid crystal technique, Korean Journal of Air-Conditioning and Refrigeration Engineering, Vol. 12, No. 4, pp. 414-421
  8. Goldstein, R. J., Yoo, S. Y. and Chung, M. K., 1990, Convective mass transfer from a square cylinder and its base plate, Int. J. of Heat and Mass Transfer, Vol. 33, pp. 9-18