Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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Effect of Number of Rough Walls on Pressure Drop and Heat Transfer in Square Channel

사각채널에서 거친 벽면의 수가 압력강하와 열전달에 미치는 효과

  • 배성택 (경상대학교 대학원 기계시스템공학과) ;
  • 김명호 (경상대학교 대학원 기계시스템공학과) ;
  • 진용수 (경상대학교 실습선) ;
  • 김성태 (경상대학교 농업시스템 공학부) ;
  • 안수환 (경상대학교 기계항공공학부, 해양산업연구소)
  • Published : 2005.03.01
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Abstract

Repeated ribs are used on heat exchange surfaces to promote turbulence and enhance convective heat transfer. Applications include fuel rods of gas-cooled nuclear reactors, inside cavities of turbine blades, and internal surfaces pipes used in heat exchangers. Despite the great number of literature papers, only few experimental data concern detailed distributions of friction factors and heat transfer coefficients in square channels varying the number of rough walls. This issue is tackled by investigating effects of different number of ribbed walls on heat transfer and friction characteristics in square channel. The rough wall have a $45{\circ}C$ inclined square rib. Uniform heat flux is maintained on whole inner heat transfer channel area. The heat transfer coefficient and friction factor values increase with increasing the number of rough walls.

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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. Lau, S. C., McMillin, R. D. and Han, J. C., 1991, 'Turbulent Heat Transfer and Friction in a Square Channel with Discrete Rib Turbulators,' J. Turbomachinery, Vol. 113, pp. 360~366 https://doi.org/10.1115/1.2927884
  7. Lau, S. C., McMillin, R. D. and Han, J. C., 1991, 'Heat Transfer Characteristics of Turbulent Flow in a Square Channel with Angled Discrete Ribs,' J. Turbomachinery, Vol. 113, pp. 367~374 https://doi.org/10.1115/1.2927885
  8. Kukreja, R. T., Lau, S. C., McMillin, R. D. and Chandra, P. R., 1991, 'Effects of Length and Configuration of Transverse Discrete Ribs on Heat Transfer and Friction for Turbulent Flow in a Square Channels,' ASME/JSME Thermal Engineering Joint Conference, Vol. 3, pp. 213~218, Reno, Nevada
  9. 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. of the KSME(B), Vol. 26, No. 11, pp. 1542~1551 https://doi.org/10.3795/KSME-B.2002.26.11.1542
  10. Rhee, D. H., Nam, Y. W. and Choi, H. H., 2004, '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 https://doi.org/10.3795/KSME-B.2004.28.3.338
  11. Nikuradse, J., 1950, 'Laws for Flow in Rough Pipes,' NACA TM, 1292
  12. Sieder, E. N. and Tate, C. E., 1936, 'Heat Transfer and Pressure Drop of Liquids in Tubes,' Ind. Eng. Chem., Vol. 28, pp. 1429∼1936 https://doi.org/10.1021/ie50324a027
  13. Kays, W. M. and Crawford, M. E., 1989, Convective Heat and Mass Transfer, 2nd ed., McGraw-Hill New York
  14. Kline, S. J. and McClintock, F. A., 1953, 'Describing Uncertainties in Single Sample Experiments,' Mech. Eng., Vol. 75, pp. 3~8
  15. Webb, R. L. and Eckert, E. R. G., 1972, 'Application of Rough Surfaces to Heat Exchanger Design,' Int. J. Heat Mass Transfer, Vol. 15, pp. 1647~1658 https://doi.org/10.1016/0017-9310(72)90095-6
  16. Chandra, P. R., Alexander, C. R. and Han, C. J., 2003, 'Heat Transfer and Friction Behaviors in Rectangular Channels with Varying Number of Ribbed Walls,' Int. J. Heat Mass Transfer, Vol. 46, pp. 481∼495 https://doi.org/10.1016/S0017-9310(02)00297-1