International Journal of Air-Conditioning and Refrigeration

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Characteristics of Heat Transfer in the Ribbed Rectangular Channel with Variable Heating Condition

  • Kim Won-Cheol (School of Mechanical & Aerospace Engineering, Institute of Marine Industry, Gyeongsang National University) ;
  • Putra Ary Bachtiar Krishna (School of Mechanical & Aerospace Engineering, Institute of Marine Industry, Gyeongsang National University) ;
  • Kang Ho-Keun (School of Mechanical & Aerospace Engineering, Institute of Marine Industry, Gyeongsang National University) ;
  • Ahn Soo-Whan (School of Mechanical & Aerospace Engineering, Institute of Marine Industry, Gyeongsang National University)
  • Published : 2007.03.30
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Abstract

Surface heat transfer of a fully developed turbulent air flow in a $45^{\circ}$ inclined ribbed square duct with two and four heating walls was experimentally investigated, at which the experimental works were performed for Reynolds numbers ranging from 7,600 to 24,900. The pitch-to-rib height ratio, p/e was kept at 8 and rib-height-to-channel hydraulic diameter ratio, $e/D_h$ was kept at 0.0667. The channel length-to-hydraulic diameter ratio, $L/D_h$ was 60. The heat transfer coefficient values were decreased with the increase in the number of heating walls. Results of this investigation could be used in various applications of internal channel turbulent flow involving roughened walls.

Keywords

References

  1. Han, J. C., 1984, Heat transfer and friction in channels with two opposite rib-roughened walls, J. Heat Transfer, Vol. 106, pp.774-781 https://doi.org/10.1115/1.3246751
  2. Han, J. C., Park, J. S. and Lei, C. K., 1985, Heat transfer enhancement in channels with turbulence promoters, J. Eng. Gas Turbine Powers, Vol. 107, pp.629-635
  3. Han, J. C., 1988, Heat transfer and friction characteristics in rectangular channels with rib turbulators, J. Heat Transfer, Vol. 110, pp.321-328 https://doi.org/10.1115/1.3250487
  4. Han, J. C. and Park, J. S., .1988, Developing heat transfer in rectangular channels with rib turbulators, Int. J. Heat Mass Transfer, Vol. 31, pp. 183-195 https://doi.org/10.1016/0017-9310(88)90235-9
  5. Han, J. C., Ou, S., Park, J. S. and Lei, C. K., 1989, Augmented heat transfer in rectangular channels of narrow aspect ratios with rib turbulators, Int. J. Heat Mass Transfer, Vol. 32, pp. 1619-1630 https://doi.org/10.1016/0017-9310(89)90044-6
  6. Choi, C., Rhee, D. H. and Cho, H. H., 2002, Heat/mass transfer and pressure drop in a square duct with V-shaped ribs, Trans. KSME(B), Vol. 26, pp.1542-1551 https://doi.org/10.3795/KSME-B.2002.26.11.1542
  7. Rhee, D. H., Nam, Y. W. and Cho, H. H., 2004, Heat/mass transfer characteristics on rib-roughened surface for impingement/effusion cooling system with initial cross flow, KSME Int. J., Vol. 28, No.3, pp. 338-348
  8. Zhang, Y. M., Azad, G. M., Han, J. C. and Lee, C. P., 2000, Turbulent heat transfer enhancement and surface heating effect in square channels with wavy and twisted tape inserts with interrupted ribs, J. Enhanced Heat Transfer, Vol. 7, pp.35-49 https://doi.org/10.1615/JEnhHeatTransf.v7.i1.40
  9. Chandra, P. R., Alexander, C. R. and Han, J. C., 2003, Heat transfer and friction behaviors in rectangular channels with varying number of ribbed wails, Int. J. Heat Mass Transfer, Vol. 46, pp. 481-495 https://doi.org/10.1016/S0017-9310(02)00297-1
  10. Sieder, E. N. and Tate, C. E., 1936, Heat transfer and pressure drop of liquids in tubes, Ind. Eng. Chem., Vol. 28, pp.1249-1256
  11. Kline, S. J. and McClintock, F. A., 1953, Describing uncertainties in single sample experiments, Mech. Eng., pp.3-8
  12. Hu, Z.J. and Shen, J., 1996, Heat transfer enhancement in a converging passage with discrete ribs, Int. J. Heat Mass Transfer, Vol. 39, pp.1719-1727 https://doi.org/10.1016/0017-9310(95)00199-9