Characteristic of Power Consumption for Paddle Impeller in Various Agitated Vessels

여러 가지 교반조에서 Paddle 임펠러의 교반소요동력 특성

  • Lee, Young Sei (School of Applied Chemical Engineering, Sangju National University) ;
  • Kato, Yoshihito (Department of Life & Material Engineering, Nagoya Institute of Technology)
  • 이영세 (상주대학교 응용화학공학부) ;
  • Received : 2005.07.11
  • Accepted : 2005.08.04
  • Published : 2005.10.10


Power consumption for paddle impeller in spherical and cylindrical agitated vessel was measured over a wide range of Reynolds number from laminar to turbulent flow regions. The power correlation was obtained for both spherical and cylindrical vessels, where the apparent diameter of the spherical vessel was equal to the diameter of the cylindrical vessel (height equal to its diameter and had the same volume as the spherical vessel). The power consumption well correlated with the experimental results of Nagata, et al. and Hixson-Baum. Also the critical Reynolds numbers was directly related to the transition coefficient $C_{tr}$ characterizing the transition from a laminar to a turbulent flow region in the correlation proposed here.


  1. R. D. Biggs, AIChE J, 9, 636 (1963)
  2. A. B. Metzner and J. S. Taylor, AIChE J, 6, 109 (1960)
  3. J. Gardner and G. Tatterson, Biotech. Bioeng., 39, 794 (1992)
  4. R. P. Rhodes and Jr. R. P. Garden, lnd. Eng. Chem., 49, 1233 (1957)
  5. M. Kamiwano, K. Yamamoto, and S. Nagata, Kagaku Kogaku, 31, 365 (1967)
  6. Y. Sano and H. Usui, J. Chem. Eng. Japan, 18, 47 (1985)
  7. Y. S. Lee, M. G. Kim, and Y. Kato, HWAHAK KONGHAK, 39, 5, 536 (2001)
  8. Y. S. Lee, M. G. Kim, and J. S. Kim, J. Korean lnd. Eng. Chem., 7, 1, 18 (1996)
  9. S. Nagata, Mixing, Principles and Applications, Kodansha, A Halsted Press Book (1975)
  10. S. Hiraoka, J. Yamada, and K. Mizoguchi, J. Chem. Eng. Japan, 11, 487 (1978)
  11. S. Hiraoka, Y. Yamada, and K. Mizoguchi, J. Chem. Eng. Japan, 12, 56 (1979)
  12. J. L. Beckner and J. M. Smith, Trans. lnst. Chem. Engrs., 44, 224 ( 1966)
  13. A. W. Hixson and S. J. Baum, Ind. Eng. Chem., 34, 194 (1942)