Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)

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

Performance Evaluation of Finned Tube Heat Exchanger with Vortex Generators in a Low Reynolds Number Regime

레이놀즈 수가 낮은 영역에서 와류발생기를 적용한 핀-관 열교환기 성능평가

  • Kwak Kyung-Min (School of Mechanical and Automotive engineering, Kyungil University) ;
  • Song Gil-Dal (Department of Mechanical Engineering, Yokohama National University)
  • 곽경민 (경일대학교 기계자동차학부) ;
  • 송길달 (일본 요코하마 국립대학교 기계공학과)
  • Published : 2006.02.01
Download PDF
⟨ Previous Next ⟩

Abstract

The present paper reports the method for evaluation of heat-transfer performance of finned tube heat exchangers in a low Reynolds number regime (Re = $160\~800$) and also reports the data of heat transfer and pressure loss taken from a finned tube heat exchanger with/without vortex generators (VGs) installed as a heat-transfer enhancement device. The evaluation is based on the modified single blow method conducted in a specially designed low Reynolds number duct. Three different test core geometries, i.e., fin only, fin-tube without VGs and that with VGs, are studied here. The data of heat transfer and pressure loss taken from the fin only geometry agree well with the empirical correlations, thus validating the present method as used for low Reynolds number regime. The data taken from the finned tube geometries with and without VGs are presented and compared to examine the effect of VGs in the low Reynolds number regime.

Keywords

References

  1. Fiebig, M., Mitra, N. and Dong, Y., 1990, Simultaneous heat transfer enhancement and flow loss reduction of fin-tubes, Proc., 9th Int. Heat Transfer Conference 4, Jerusalem, pp. 51-55
  2. Fiebig, M., 1995, Vortex generators for compact heat exchangers, Journal of Enhanced Heat Transfer, Vol. 2, Nos. 1-2, pp. 43-61 https://doi.org/10.1615/JEnhHeatTransf.v2.i1-2.60
  3. Fiebig, M., Valencia, A. and Mitra, N. K., 1994, Local heat transfer and flow losses in fin-and-tube heat exchangers with vortex generators: a comparison of round and flat tubes, Experimental Thermal and Fluid Science, Vol. 8, pp. 35-45 https://doi.org/10.1016/0894-1777(94)90071-X
  4. Kwak, K. M., Torii, K. and Bai, C. M., 2003, Performance evaluation in fin-tube heat exchanger by tow-in winglet pairs (in Korean), Korean J. of Air-Conditioning and Refrigeration Engineering, Vol. 15, No. 2, pp. 87-94
  5. Liang, C. Y. and Yang, W. J., 1975, Modified single-blow technique for performance evaluation on heat transfer surfaces, Trans. ASME, Journal of Heat Transfer, Vol. 97, No. 1, pp. 16-21 https://doi.org/10.1115/1.3450280
  6. Mochizuki, S., Yagi, Y. and Yang, W. J., 1998, Advances in single-blow method for performance evaluation of heat transfer surfaces, Pro. of 2nd Int. Symp, on Heat Transfer 1, Beijing, China, pp. 284-291
  7. Park, B. K, Hong, T. and Park, S. H., 1999, Performance evaluation technique of a heat exchanger using a transient response analysis (in Korean), Korean J. of Air-Conditioning and Refrigeration Engineering, Vol. 11, No. 1, pp. 81-90
  8. Kays, W. M. and London, A. L., 1964, Compact Heat Exchangers, 2nd ed., McGraw-Hill, New York, Chap. 5
  9. Shah, R. K, 1975, Thermal entry length solutions for the circular tube and parallel plates, Proc. Natl. Heat Mass Transfer Conf., 3rd, Indian Inst. Techonol., Bombay, Vol. I. Pap. No. HMT-11-75
  10. Shah, R. K, 1978, A correlation for laminar hydrodynamic entry length solutions for circular and noncircular ducts, J. Fluids Eng 100, pp. 177-179 https://doi.org/10.1115/1.3448626
  11. Stephan, K, 1959, Warmeubergang und Druckabfall bei nicht ausgebildeter Laminarstromung in Rohren und in ebenen Spalten, Chemie-Ing.-Techn. 31-12, pp. 773-779