On the main flow features and instabilities in an unbaffled vessel agitated with an eccentrically located impeller

Chemical Engineering Science

Volumn 63, Issue 18, 2008, Pages 4494-4505

  Galletti, Chiara ^a   Brunazzi, Elisabetta ^a  

^a UNIVERSITY OF PISA   (Italy)

Author keywords

Eccentric agitation; Hydrodynamics; Macro instability; Mixing; Turbulence; Unbaffled vessel

Indexed keywords

ELECTRIC GENERATORS; FLOW VISUALIZATION; FLUID MECHANICS; KINETIC ENERGY; MIXING; TURBULENCE; VORTEX FLOW; VORTEX SHEDDING;

ECCENTRIC AGITATION; FLOW FEATURES; FLOW FIELDS; FLOW INSTABILITIES; HYDRODYNAMICS; LASER-DOPPLER ANEMOMETRY; LINEARLY DEPENDENT; LOW FREQUENCIES; LOW-FREQUENCY COMPONENTS; MACRO-INSTABILITY; MICRO-MIXING; ROTATIONAL SPEEDS; RUSHTON TURBINES; TIME SCALING; TURBULENCE QUANTITIES; TURBULENT KINETIC ENERGY; UNBAFFLED VESSEL; VERTICAL PLANES; VISUALISATION;

FLUID DYNAMICS;

EID: 52049110742     PISSN: 00092509     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.ces.2008.06.007     Document Type: Article

References (32)

1. Aloi L.E., and Cherry R.S. Cellular response to agitation characterized by energy dissipation at the impeller tip. Chemical Engineering Science 51 (1996) 1523-1529
2. Álvarez M.M., Arratia P.E., and Muzzio F.J. Laminar mixing in eccentric stirred tank systems. Canadian Journal of Chemical Engineering 80 (2002) 546-557
3. Ascanio G., and Tanguy P.A. Mixing of shear-thinning fluids with dual off-centred impellers. Canadian Journal of Chemical Engineering 83 (2005) 393-400
4. Assirelli M., Bujalski W., Eaglesham A., and Nienow A.W. Macro- and micromixing studies in an unbaffled vessel agitated by a Rushton turbine. Chemical Engineering Science 63 (2008) 35-46
5. Brunazzi E., Galletti C., Paglianti A., and Pintus S. Laser-Doppler measurements of turbulent-flow parameters: comparison between baffled and unbaffled stirred tanks. AIDIC Conference Series 6 (2003) 67-76
6. Cabaret F., Fradette L., and Tanguy P.A. Gas-liquid mass transfer in unbaffled dual-impeller mixers. Chemical Engineering Science 63 (2008) 1636-1647
7. Cudak M., and Karcz J. Momentum transfer in an agitated vessel with off-centred impellers. Chemical Papers 60 (2006) 375-380
8. Cudak M., and Karcz J. Distribution of local heat transfer coefficient values in the wall region of an agitated vessel. Chemical Papers 62 (2008) 92-99
9. Ducci A., and Yianneskis M. Vortex tracking and mixing enhancement in stirred processes. A.I.Ch.E. Journal 53 (2007) 305-315
10. Galletti C., Brunazzi E., Yianneskis M., and Paglianti A. Spectral and wavelet analysis of the flow pattern transition with impeller clearance variations in a stirred vessel. Chemical Engineering Science 58 (2003) 3859-3875
11. Galletti C., Brunazzi E., Pintus S., Paglianti A., and Yianneskis M. A study of Reynolds stresses, triple products and turbulence states in a radially stirred tank with 3-D laser anemometry. Chemical Engineering Research & Design 82 (2004) 1214-1228
12. Galletti C., Paglianti A., and Yianneskis M. Observations on the significance of instabilities turbulence and intermittent motions on fluid mixing processes in stirred reactors. Chemical Engineering Science 60 (2005) 2317-2331
13. Hall J.F., Barigou M., Simmons M.J.H., and Stitt E.H. Comparative study of different mixing strategies in small high throughput experimentation reactors. Chemical Engineering Science 60 (2005) 2355-2368
14. Hall J.F., Barigou M., Simmons M.J.H., and Stitt E.H. A PIV study of hydrodynamics in gas-liquid high throughput experimentation (HTE) reactors with eccentric impeller configurations. Chemical Engineering Science 60 (2005) 6403-6413
15. Harnby N., Edwards M.F., and Nienow A.W. Mixing in the Process Industries. second ed (1997), Butterworth Heinemann, London
16. Karcz, J., Cudak, M., 2006. An effect of the type of an eccentrically located impeller on the efficiency of heat transfer process. In: Proceedings of the 12th European Conference on Mixing, Bologna, 27-30 June 2006, pp. 727-734.
17. Karcz J., Cudak M., and Szoplik J. Stirring of a liquid in a stirred tank with an eccentrically located impeller. Chemical Engineering Science 60 (2005) 2369-2380
18. Kramers H., Baars G.M., and Knoll W.H. A comparative study on the rate of mixing in stirred tanks. Chemical Engineering Science 2 (1953) 35-42
19. Lamberto D.J., Muzzio F.J., Swanson P.D., and Tonkovich A.L. Using time-dependent RPM to enhance mixing in stirred vessels. Chemical Engineering Science 51 (1996) 733-741
20. Medek, J., Fort, I., 1985. Mixing in vessel with eccentrical mixing. In: Proceedings of the Fifth European Conference on Mixing, Würzburg, West Germany, 10-12 June 1985, pp. 263-280.
21. Montante G., Bakker A., Paglianti A., and Magelli F. Effect of the shaft eccentricity on the hydrodynamics of unbaffled stirred tanks. Chemical Engineering Science 61 (2006) 2807-2814
22. Nikiforaki L., Montante G., Lee K.C., and Yianneskis M. On the origin, frequency and magnitude of macro-instabilities of the flows in stirred vessels. Chemical Engineering Science 58 (2003) 2937-2949
23. Nishikawa M., Ashiwake K., and Hashimoto S. Agitation power and mixing time in off-centring mixing. International Chemical Engineering 19 (1979) 153-159
24. Paglianti A., Montante G., and Magelli F. Novel experiments and a mechanistic model for macroinstabilities in stirred tanks. A.I.Ch.E. Journal 52 (2006) 426-437
25. Paul E.L., Atiemo-Obeng V.A., and Kresta S.M. Handbook of Industrial Mixing. Science and Practice (2004), Wiley, New York
26. Rivera C., Heniche M., Ascanio G., and Tanguy P. A virtual finite element model for centered and eccentric mixer configurations. Computers & Chemical Engineering 28 (2004) 2459-2468
27. Roshko A. Perspectives on bluff body aerodynamics. Journal of Wind Engineering and Industrial Aerodynamics 49 (1993) 79-100
28. Roussinova V., Kresta S.M., and Weetman R. Low frequency macroinstabilities in a stirred tank: scale-up and prediction based on large eddy simulations. Chemical Engineering Science 58 (2003) 2297-2311
29. Sánchez Cervantes M.I., Lacombe J., Muzzio F.J., and Álvarez M.M. Novel bioreactor design for the culture of suspended mammalian cells Part I: mixing characterization. Chemical Engineering Science 61 (2006) 8075-8084
30. Tatterson G.B. Fluid Mixing and Gas Dispersion in Agitated Tanks (1991), McGraw-Hill, New York
31. Vinci, S., 2004. Fluid dynamical characterisation with optical techniques of stirred vessels. M.S. Thesis in Chemical Engineering, Pisa (in Italian).
32. Wang B., Zhang J., He Y., and An S. Investigation on eccentric agitation in the stirred vessel using 3D-laser Doppler velocimeter. Chinese Journal of Chemical Engineering 14 (2006) 618-625