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An Experimental Studies on Heat Transfer and Friction Factor in a Square Channel with Varying Number of Ribbed Walls

Oh Se-Kyung    (School of Mechanical and Aerospace Engineering, Gyeongsang National University   ); Kim Won-Cheol    (School of Mechanical and Aerospace Engineering, Gyeongsang National University   ); Ahn Soo-Whan    (Gyeongsang National University, Institute of Marine Industry   ); Kang Ho-Keun    (School of Mechanical and Aerospace Engineering, Gyeongsang National University   ); Kim Myoung-Ho    (Department of Mechanical System Engineering, Graduate School, Gyeongsang National University  );
  • 초록

    An experimental study on the heat transfer and friction characteristics of a fully developed turbulent air flow in a square channel with $45^{\circ}$ inclined ribs on one, two, and four walls is reported. Tests were performed for Reynolds number 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 heat transfer coefficient and friction factor values were enhanced with the increase in the number of ribbed walls. Results of this investigation could be used in various applications of internal channel turbulent flows involving different number of roughened walls.


  • 주제어

    Number of ribbed walls .   Square channel .   Friction factor .   Nusselt number.  

  • 참고문헌 (12)

    1. J. C. Han, S. Ou, J. S. Park. and C. K. Lei, 'Augmented Heat Transfer in Rectangular Channels of Narrow Aspect Ratios with Rib Turbulators,' Int. J. Heat Mass Transfer. Vol. 32, pp. 1619-1630, 1989 
    2. C. Choi, D. H. Rhee, and H. H. Cho. 'Heat/Mass Transfer and Pressure Drop in a Square Duct with V-shaped Ribs.' Trans. of the KSME(B), Vol. 26, No. 11, pp. 1542-1551, 2002 
    3. D. H. Rhee, Y. W. Nam and H. H. Choi, 'Heat/Mass Transfer Characteristics on Rib-roughened Surface for Impingement/Effusion Cooling System with Initial Crossflow,' Trans. of the KSME(B), Vol. 28, No. 3, pp. 338-348, 2004 
    4. J. C. Han, J. S. Park, and C. K. Lei. 'Heat Transfer Enhancement in Channels with Turbulence Promoters,' J. Eng. Gas Turbine Powers. Vol. 107. pp. 629-635, 1985 
    5. J. C. Han and J. S. Park, 'Developing Heat Transfer in Rectangular Channels with Rib Turbulators.' Int. J. Heat Mass Transfer. Vol. 31. pp. 183-195. 1988 
    6. J. C. Han, 'Heat Transfer and Friction in Channels with Two Opposite Ribroughened Walls.' J. Heat Transfer, Vol. 106. pp. 774-781. 1984 
    7. Y. M. Zhang. G. M. Azad, J. C. Han and C. P. Lee, 'Turbulent eat Transfer Enhancement and Surface Heating Effect in Square Channels with Wavy, and Twisted Tape Inserts Plus Interrupted Ribs', Enhanced Heat Transfer, Vol. 7. pp. 35-49, 2000 
    8. S. J. Kline and F. A. McClintock, 'Describing Uncertainties in Single Sample Experiments.' Mech. Eng., Vol. 75. pp. 3-8, 1953 
    9. P. R. Chandra. C. R. Alexander and C. J. Han, 'Heat Transfer and Friction Behaviors in Rectangular Channels with Varying Number of Ribbed Walls.' Int. J. Heat Mass Transfer, Vol. 46, pp. 481-495, 2003 
    10. J. C. Han, 'Heat Transfer and Friction Characteristics in Rectangular Channels with Rib Turbulators,' J. Heat Transfer, Vol. 110, pp. 321-328, 1988 
    11. W. M. Kays and M. E. Crawford, Convective Heat and Mass Transfer, 2nd ed.. McGraw-Hill, New York, 1989 
    12. E. N. Sieder and C. E. Tate, 'Heat Transfer and Pressure Drop of Liquids in Tubes,' Ind. Eng. Chem., Vol. 28. pp. 1429-1936, 1936 
  • 이 논문을 인용한 문헌 (1)

    1. Ahn, Soo-Whan ; Kang, Ho-Keun ; Bae, Sung-Taek ; Song, Min-Ho 2006. "Effects of Baffles on Heat Transfer and Friction Factors in a Rectangular Channel" 한국마린엔지니어링학회지 = Journal of the Korean Society of Marine Engineering, 30(6): 693~701     

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  • Kim Won-Cheol (1)

  • Ahn, Soo-Whan (66)

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