skip to main content

Impeller Submergence Depth for Stirred Tanks

Thiyam T. Devi  -  Department of Civil Engineering, Indian Institute of Technology Guwahati, Guwahati 781039, India
Annu P. Sinha  -  Agriculture Engineering, JNKVV, Jabalpur, India
Meena Thakre  -  Agriculture Engineering, JNKVV, Jabalpur, India
*Bimlesh Kumar  -  Department of Civil Engineering, Indian Institute of Technology Guwahati, Guwahati 781039, India

Citation Format:

Impeller submergence governs the performance of mixing tanks employed in oxygen transfer operation. Present work experimentally investigates the effect of impeller submergence depths on oxygen transfer and corresponding power consumption. It has been found that at higher range of impeller submergence, mixing tanks consume less power and gives higher values of oxygen transfer coefficient. Optimal range of submergence depth is 0.7 to 0.9 times the impeller diameter. Copyright ©2011 BCREC UNDIP. All rights reserved.

(Received: 4th March 2011; Revised: 12nd July 2011; Accepted: 14th July 2011)

[How to Cite: T.T. Devi, A.P. Sinha, M. Thakre, and B. Kumar. (2011). Impeller Submergence Depth for Stirred Tanks. Bulletin of Chemical Reaction Engineering & Catalysis, 6 (2): 123-128. doi:10.9767/bcrec.6.2.826.123-128]

[How to Link / DOI: || or local:]

View in 

Fulltext View|Download
Keywords: oxygen transfer; power consumption; rotational speed; submerged depth;stirred tanks; two-film theory

Article Metrics:

  1. Oldshue, J.Y. 1983. Fluid Mixing Technology. McGraw-Hill, New York
  2. Ulbrecht, J.J., Patterson, G.K. 1985. Mixing of Liquids by Mechanical Agitation. Chemical Engineering Series: Concepts and Reviews, Volume 1, Gordon and Breach Science Publishers, London
  3. Assirelli, M., Bujalski, W., Eaglesham, A., Nienow, A.W. 2002. Study of micromixing in a stirred tank using a Rushton turbine: comparison of feed position and other mixing devices. Trans. IChem. 80: 855–863
  4. Ciofalo, M., Brucato, A., Grisafi, F., Torraca, N. 1996. Turbulent flow in closed and free-surface unbaffled tanks. Chem. Eng. Sci. 51: 3557-3573
  5. Li, M., White, G., Wilkinson, D., Roberts, K.J. 2004. LDA measurements and CFD modeling of a stirred vessel with a retreat curve impeller. Ind. Eng. Chem. Res. 43: 6534–6547
  6. Montante, G., Lee, K.C., Brucato, A., Yianneskis, M. 2001. Numerical simulations of the dependency of flow pattern on impeller clearance in stirred vessels. Chem. Eng. Sci. 56: 3751–3770
  7. Nagata, S. 1975. Mixing Principles and applications. John Wiley & sons, New York
  8. Nienow, A.W. 1998. Hydrodynamics of stirred bioreactors. Appl. Mech. Rev. 51: 1–32
  9. Ognean, T. 1993. Dimensionless criteria for estimating oxygen transfer in aeration systems. Biotechnol. Bioeng. 41: 1014-1020
  10. Patil, S.S., Deshmukh, N.A., Joshi, J.B. 2004. Mass transfer characteristics of surface aerators and gasinducing impellers. Ind. Eng. Chem. Res. 43: 2765-2774
  11. Rushton, J.H. 1952. Applications of fluid mechanics and similitude to scale-up problems-part1. Chem. Eng. Prog. 48: 33-38
  12. Kumar, B., Devi, T.T., Patel, A.K., Bhatla, A. 2010. Optimal Geometric Configuration for Power Consumption in Baffled Surface Aeration Tanks. Bull. Chem. React. Eng. Catal. 5 (2): 87 - 93. [" target="_blank">linked fulltext BCREC ] [Fulltext via CrossRef]
  13. Zlokarnik, M. 1979. Scale-up of surface aerators for waste water treatment. Adv. Biochem. Eng. 11:157-180
  14. Backhurst, J.R., Harker, J.H., Kaul, S.N. 1998. The performance of pilot and full-scale vertical shaft aerators. Water Res. 22: 1239-1243
  15. Takase, H., Unno, H., Akehata, T. 1984. Oxygen transfer in a surface aeration tank with square cross section. Int. Chem. Eng. 21: 128-134
  16. Hwang, H.J., Stenstrom, M.K. 1985. Evaluation of finebubble alpha factors in near-full scale equipment. J. Water Pollution Control Fed. 57 : 1142-1150
  17. Vasel, J.L. 1988. Contribution á l’étude des transferts d'oxygène en gestion des eaux. Ph.D. Thesis, Fondation Universitaire Luxemourgeoise, Luxembourg, Arlon
  18. Johnson, A.I., Huang, C. 1956. Mass transfer studies in an agitated vessel. AIChE J. 2: 412-419
  19. Walas, S.M. 1980. Chemical Process Equipment - Selection and Design. Butterworth-Heinemann, Washington Street, Newton, MA, USA
  20. King, R.L., Hiller, R.A., Tatterson, G.B. 1988. Power consumption in a mixer. AIChE J. 34: 506-509
  21. Ascanio, G., Castro, B., Galindo, E. 2004. Measurement of power consumption in stirred vessels—a review. Chem. Eng. Res. Des. 82: 1282–290
  22. Nienow, A.W., Ulbrecht, J.J. 1985. Mixing of Liquids by Mechanical Agitation. Eds. Ulbrecht, J.J. and Patterson, G.K., Gordon and Breach, New York, Chapter 6, 203-237
  23. Lewis, W.K., Whitman, W.G. 1924. Principles of gas absorption. Ind. Eng. Chem. 16: 1215-1220
  24. Brown, L.C., Baillod, C.R. 1982. Modeling and interpreting oxygen transfer data. J. Environ. Eng. 108: 607-628
  25. Deshmukh, N.A., Joshi, J.B. 2006. Surface aerators: power number, mass transfer coefficient, gas hold up profiles and flow patterns. Chem. Eng. Res. Des. 84: 1–16

Last update:

No citation recorded.

Last update:

No citation recorded.