Journal of Mechanical Science and Technology

The Korean Society of Mechanical Engineers (대한기계학회)
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Friction Factor and Heat Transfer in Equilateral Triangular Ducts with Surface Roughness

  • Ahn, Soo-Whan (School of Transport Vehicle Engineering, Gyeongsang National University, Institute of Marine Industry.)
  • Published : 2001.05.01
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Abstract

Experimental investigations were conducted to study forced convection of fully developed turbulent flows in horizontal equilateral triangular ducts with different surface roughness pitch ratios (P/e) of 4, 8, and 16 on one side. The ducts bottom wall was heated uniformly and the other surfaces were thermally insulated. To understand heat transfer enhancement mechanism, heat transfer rates were measured. Smooth triangular ducts were also tested for benchmark purposes. The results were compared with previous results for similarly configured channels, at which they were roughened by regularly spaced transverse ribs in the rectangular and circular channels.

Keywords

References

  1. Ahn, S.W., 1999a 'Structure of Turbulence of Fully Developed Flow in Concentric Annuli with Rough Outer Wall,' Korean J. of Air-Conditioning and Refrigeration Eng., Vol. 11, No. 1, pp. 1-9(in Korea)
  2. Ahn, S.W., 1999b, 'Friction Factors for Flow in Concentric Annuli with Rib-Roughened Wall,' Transactions of KSME(B), Vol. 23 No.5, pp. 587-592(in Korea)
  3. Altemani, C.A. C. and Sparrow, E.M., 1980, 'Turbulent Heat Transfer and Fluid Flow in an Unsymmetrically Heated Triangular Duct,' ASME J. of Heat Transfer, Vol. 102, pp. 590-597
  4. Bhuiyan, A., 1977, 'An Asymmetric Turbulent Fluid Flow Induced By Rectangular Ribbed Surface Roughness,' Master of Appl. Sci., Mech. Eng., Univ, of Ottawa, Ontario
  5. Hall, W.B., 1962, 'Heat Transfer in Channels Having Rough and Smooth Surfaces,' J. Mech. Engng. Sci., pp. 287-291 https://doi.org/10.1243/JMES_JOUR_1962_004_037_02
  6. Han, J.C., 1988, 'Heat Transfer and Friction Characteristics in Rectangular Channels with Rib Turbulators,' ASME J. of Heat Transfer, Vol. 110, pp. 321-328
  7. Han, J.C., Glicksman, L.R., and Rohsenow, 1978, 'An Investigation of Heat Transfer and Friction for Rib-Roughness Surfaces,' Int. J. Heat Mass Transfer, Vol. 21, pp. 1143-1156 https://doi.org/10.1016/0017-9310(78)90113-8
  8. Han, J.C., Park, J.S. and Lei, C.K., 1985, 'Heat Transfer Enhancement in Channels with Turbulence Promoters,' ASME J. of Heat Transfer, Vol. 107, pp. 321-328
  9. Hong, Y.J. and Hsieh, S.S. 1993, 'Heat Transfer and Friction factor Measurements in Ducts with Staggered and In-Line Ribs,' ASME J. of Heat Transfer, Vol. 115, pp. 58-65
  10. Kang, H,J., Wong, T.T., and Leung, C.W., 1998, 'Enhanced Forced Convection in Triangular Ducts by Roughened Surface,' Proc. of 11th IHTC, Vol. 5, pp. 375-380
  11. Kays, W.M. and Crawford, M.E., 1993, Convective Heat and Mass Transfer, 3rd Ed., McGraw-Hill Book Co.
  12. Kays, W.M. and London, A.L., 1984, Compact Heat Exchangers, 3rd Ed. McGraw-Hill Book Co.
  13. Kline, S.J., and McClintock, F.A., 1953, 'Describing Uncertainties in Single - Sample Experiment,' Mechanical Engineering, Vol. 75, pp. 3-8
  14. Kwon, H.J., Wu, S.J. and Cho, H.H., 2000, 'Effects of Discrete Rib-Turbulators on Heat/ Mass Transfer Augumentation in a Rectangular Duct,' Transations of KSME(B), Vol. 24, No.5, pp. 744-752(in Korea)
  15. Lee, Y.P. and Ahn, S.W. and Lee, Y., 1990, 'Turbulent Fluid Flow and Heat Transfer Induced by Square-Ribbed Surface Roughness in Concentric Annuli,' Proc. of 9th Int. Heat Transfer Conf., 4-MC-20, Jerusalem, pp. 466-470
  16. Shah, R.K. and London A.L., 1978, Laminar Flow Forced Convection in Ducts, Academic Press Book Co.
  17. Siegel, R. and Howell, J.R., 1981, Thermal Radiation Heat Transfer, 2nd ed., McGraw-Hill Book Co.
  18. Webb, R.L., 1995, Fundamentals of Enhanced Heat Transfer, Wiley Inter Science Book Co.
  19. Webb, R.L. and Eckert, E.R. G., 1972, 'Application of Rough Surfaces to Heat Exchanger Design,' Int. J. of Heat Mass Transfer, Vol. 15, pp. 1647-1658 https://doi.org/10.1016/0017-9310(72)90095-6
  20. Webb, R.L., Eckert, E.R. G., and Goldstein. R. J., 1971, 'Heat Transfer and Friction in Tubes with Repeated-Ribs Roughness,' Int. J. Heat Mass Transfer, Vol. 15, pp. 601-617 https://doi.org/10.1016/0017-9310(71)90009-3
  21. Wilkie, D., 1966, 'Forced Convection Heat Transfer from Surfaces Roughened by Transverse Ribs,' Proc. of 3rd IHTC, Paper I