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2011 | 32 | 4 | 351-366
Article title

Numerical study of fluid flow and power consumption in a stirred vessel with a Scaba 6SRGT impeller

Content
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EN
Abstracts
EN
The present work deals with agitation of non-Newtonian fluids in a stirred vessel by Scaba impellers. A commercial CFD package (CFX 12.0) was used to solve the 3D hydrodynamics and to characterise at every point flow patterns especially in the region swept by the impeller. A shear thinning fluid with yield stress was modelled. The influence of agitator speed, impeller location and blade size on the fluid flow and power consumption was investigated. The results obtained are compared with available experimental data and a good agreement is observed. It was found that an increase in blade size is beneficial to enlargement of the well stirred region, but that results in an increased power consumption. A short distance between the impeller and the tank walls limits the flow around the agitator and yields higher power consumption. Thus, the precise middle of the tank is the most appropriate position for this kind of impeller.
Publisher
Year
Volume
32
Issue
4
Pages
351-366
Physical description
Dates
published
1 - 12 - 2011
online
15 - 2 - 2012
References
  • Anne-Archard D., Marouche M., Boisson H.C., 2006. Hydrodynamics and Metzner-Otto correlation in stirred vessels for yield stress fluids. Chem. Eng. J., 125, 15-24. DOI:10.1016/j.cej.2006.08.002.[Crossref]
  • Amanullah A., Hjorth S.A., Nienow A.W., 1997. Cavern sizes generated in highly shear thinning viscous fluids by Scaba 3SHP1 impeller. Food Bioprod. Process, 75, 232-238. DOI:10.1205/096030897531630.[Crossref]
  • Armenante P.M., Luo C., Chou C.C., Fort I., Medek J., 1997. Velocity profiles in a closed, unbaffled vessel: comparison between experimental LDV data and numerical CFD prediction. Chem. Eng. Sci., 52, 3483-3492. DOI:10.1016/S0009-2509(97)00150-4.[Crossref]
  • Arratia P.E., Kukura J., Lacombe J., Muzzio F.J., 2006. Mixing of shear-thinning fluids with yield stress in stirred tanks. AIChE J., 52, 2310-2322. DOI: 10.1002/aic.10847.[Crossref]
  • Aubin J., Naude I., Xuereb C., Bertrand J., 2000. Blending of Newtonian and shear-thinning fluids in a tank stirred with a helical screw agitator. Trans. Inst. Chem. Eng., 78(A), 1105-1114. DOI: 10.1205/026387600528382.[Crossref]
  • Bhole M., Ford C., Bennington C.P.J., 2009. Characterization of axial flow impellers in pulp fibre suspensions. Chem. Eng. Res. Des., 87, 648-653. DOI:10.1016/j.cherd.2008.11.002.[Crossref][WoS]
  • Buwa V., Dewan A., Nasser A.F., Durst F., 2006. Fluid dynamics and mixing of single-phase flow in a stirred vessel with a grid disc impeller: experimental and numerical investigations, Chem. Eng. Sci. 61, 2815-2822. DOI: 10.1016/j.ces.2005.10.066.[Crossref]
  • Couerbe G., Fletcher D.F., Xuereb C., Poux M., 2008. Impact of thixotropy on flow patterns induced in a stirred tank: Numerical and experimental studies. Chem. Eng. Res. Des., 86, 545-553. DOI: 10.1016/j.cherd.2007.11.010.[Crossref][WoS]
  • Derksen J.J., Prashant A., 2009. Simulations of complex flow of thixotropic liquids. J. Non-Newton. F. Mech., 160, 65-75. DOI:10.1016/j.jnnfm.2009.02.011.[Crossref]
  • Derksen J.J., 2011. Simulations of thixotropic liquids. App. Math. Mod., 35, 1656-1665. DOI:10.1016/j.apm.2010.09.042.[Crossref]
  • Elson T.P., 1990. The growth of caverns formed around rotation impellers during the mixing of a yield stress fluid. Chem. Eng. Commun., 96, 303-391. DOI:10.1080/00986449008911498.[Crossref]
  • Ein-Mozaffari F., Upreti S.R., 2009. Using electronic Dopller velocimetry and CFD modeling to investigate the mixing of non-Newtonian fluids possessing yield stress. Chem. Eng. Res. Des., 87, 515-523. DOI:10.1016/j.cherd.2008.12.020.[WoS][Crossref]
  • Ford C., Ein-Mozaffari F., Bennington C.P.J., Taghipour F., 2006. simulation of mixing dynamics in agitated pulp stock chests using CFD. AIChE J., 52 (10), 3562-3569. DOI: 10.1002/aic.10958.
  • Fuente B., Choplin L., Tanguy P. A., 1997. Mixing with helical ribbon impellers: effect of highly shear thinning behavior and impeller geometry. Trans. I. Chem. Eng., 75, 45-52. DOI:10.1205/026387697523381.[Crossref]
  • Galindo E., Nienow A.W., 1992. Mixing of highly viscous simulated xanthan fermentation broths with the Lightnin A-315 impeller. Biotechnol. Prog., 8, 233-239. DOI: 10.1021/bp00015a009.[Crossref]
  • Galindo E., Nienow A.W., 1993. The performance of the Scaba 6SRGT agitator in the mixing of simulated xanthan gum broths. Chem. Eng. Technol. 16, 102-108. DOI: 10.1002/ceat.270160206.[Crossref]
  • Gomez C., Derakhshandeh B., Hatzikiriakos S.G., Bennington C.P.J., 2010. Carbopol as a model fluid for studying mixing of pulp fibre suspensions. Chem. Eng. Sci., 65, 1288-1295. DOI:10.1016/j.ces.2009.09.085.[Crossref][WoS]
  • Iranshahi A., Heniche M., Bertrand F., Tanguy P.A., 2006. Numerical investigation of the mixing efficiency of the Ekato Paravisc impeller. Chem. Eng. Sci., 61, 2609-2617. DOI:10.1016/j.ces.2005.11.032.[Crossref]
  • Ihejirika P., Ein-Mozaffari F., 2007. Using CFD and ultrasonic velocimetry to study the mixing of pseudoplastic fluids with a helical ribbon impeller. Chem. Eng. Technol., 30, 606-614. DOI: 10.1002/ceat.200700006.[WoS][Crossref]
  • Kelly W., Humphrey A.E., 1998. Computational fluid dynamics model for predicting flow of viscous fluids in a large fermentor with hydrofoil flow impellers and internal cooling coils, Biotechnol. Prog., 14, 248-258. DOI: 10.1021/bp9701168.[Crossref]
  • Letellier B., Xuereb C., Swaels P., Hobbes P., Bertrand J., 2002. Scale-up in laminar and transient regimes of a multi-stage stirrer, a CFD approach, Chem. Eng. Sci., 57, 4617-4632. DOI: S0009-2509(02)00371-8.[Crossref]
  • Liang Y., Jingwei M., Shulin C., 2011. Numerical simulation of mechanical mixing in high solid anaerobic digester. Bioresource Tech., 102, 1012-1018. DOI:10.1016/j.biortech.2010.09.079.[Crossref]
  • Macosko C.W., 1994. Rheology: Principles, Measurements & Applications. Wiley-VCH, New York, 47-49.
  • Metzner B., Otto R.E., 1957. Agitation of non-Newtonian fluids. AIChE J., 3, 3-11. DOI: 10.1016/S0065-2377(08)60311-7.[Crossref]
  • Moilanen P., Laakkonen M., Aittamaa J., 2006. Modeling aerated fermenters with CFD. Ind. Eng. Chem. Res., 45, 8656-8663. DOI:10.1016/S1570-7946(05)80240-8.[Crossref]
  • Murthy S.S., Jayanti S., 2003. Mixing of power-law fluids using anchors: Metzner-Otto concept revisited. AIChE J., 49, 30-40. DOI: 10.1002/aic.690490105.[Crossref]
  • Naude I., 1998. Direct simulations of impellers in a stirred tank. Contribution to the optimization of the choice of an agitator, Ph.D. thesis, INPT, France.
  • Pakzad L., Ein-Mozaffari F., Chan P., 2007. Using computational fluid dynamics modeling to study the mixing of pseudoplastic fluids with a Scaba 6SRGT impeller. Chem. Eng. Proc., 47, 2218-2227. DOI:10.1016/j.cep.2007.12.003.[Crossref]
  • Pakzad L., Ein-Mozaffari F., Chan P., 2008. Using electrical resistance tomography and computational fluid dynamics modeling to study the formation of cavern in the mixing of pseudoplastic fluids possessing yield stress. Chem. Eng. Sci., 63, 2508-2522. DOI:10.1016/j.ces.2008.02.009.[Crossref][WoS]
  • Prajapati P., Ein-Mozaffari F., 2009. CFD investigation of the mixing of yield-pseudoplastic fluids with anchor impeller. Chem. Eng. Tech., 32, 1211-1218. DOI: 10.1002/ceat.200800511.[Crossref]
  • Saeed S., Ein-Mozaffari F., Upreti S.R., 2007. Using computational fluid dynamics modeling and ultrasonic doppler velocimetry to study pulp suspension mixing. Ind. Eng. Chem. Res., 46, 2172-2179. DOI: 10.1021/ie0607548.[WoS][Crossref]
  • Saeed S., Ein-Mozaffari F., 2008. Using dynamic tests to study the continuous mixing of xanthan gum solutions. J. Chem. Technol. Biotechnol., 83 (4), 559-568. DOI: 10.1002/jctb.1833.[WoS][Crossref]
  • Sahu A.K., Kummar P., Joshi J.B., 1998. Simulation of flow in stirred vessels with axial flow impellers: zonal modeling and optimization of parameter. Ind. Eng. Chem. Res., 37, 2116-2130. DOI: 10.1021/ie970321s.[Crossref]
  • Serrano-Carreon L., Galindo E., 1997. Studies on cavern development in mixing a yield stress fluid in a pilotscale Proto-Fermenter, In: Villermaux J., Bertrand J. (Eds.), Récents Progrès en Génie des Procédés, 11, 161-168.
  • Singh H., Fletcher D.F., Nijdam J.J., 2011. An assessment of different turbulence models for predicting flow in a baffled tank stirred with a Rushton turbine. Chem. Eng. Sci., 66, 5976-5988. DOI:10.1016/j.ces.2011.08.018.[Crossref][WoS]
  • Vishalkumar R.P., Ein-Mozaffari F., Upreti S.R., 2011. Effect of time delays in characterizing the continuous mixing of non-Newtonian fluids in stirred-tank reactors. Chem. Eng. Res. Des., 89, 1919-1928. DOI: 10.1016/j.cherd.2011.01.023.[Crossref][WoS]
  • White F.M., 1974. Viscous Fluid Flow, McGraw-Hill, New York, USA, 62-64.
  • Wichterle K., Wein O., 1975. Agitation of concentrated suspensions. CHISA, B4.6, Prague, Czechoslovakia. 2-5 July 1975, 33-39.
  • Wu B., 2011. CFD investigation of turbulence models for mechanical agitation of non-Newtonian fluids in anaerobic digesters. Water Res., 45, 2082-2094. DOI:10.1016/j.watres.2010.12.020.[Crossref][WoS]
  • ---
  • Xia J.Y., Wang Y.H., Zhang S., Chen N., Yin P., Zhuang Y., Chu J., 2009. Fluid dynamics investigation of variant impeller combinations by simulation and fermentation experiment. Biochem. Chem. Eng. J., 43, 252-260. DOI: 10.1016/j.bej.2008.10.010.[Crossref]
Document Type
Publication order reference
YADDA identifier
bwmeta1.element.-psjd-doi-10_2478_v10176-011-0028-0
Identifiers
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