Mixing performance induced by coaxial flat blade-helical ribbon impellers rotating at different speeds

Tanguy, Philippe A.; Thibault, Francis; Fuente, Edmundo Brito-de la; Espinosa-Solares, Teodoro; Tecante, Alberto

doi:10.1016/s0009-2509(97)00008-0

Cited by 62 publications

(37 citation statements)

References 6 publications

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“…Another technique, developed by Bertrand and Tanguy, 11,12 superimposes a moving-part geometry on the meshed flow domain using Lagrangian multipliers with a velocity constraint, which has been dubbed the virtual finite-element method. Results generated using this technique compared favorably with earlier experimental and fixed mesh results of Tanguy et al 13,14 and were used 18,19 and limited particle tracking, and were able to discern significant differences in the mixing and potential problem spots in the mixers.…”

mentioning

confidence: 72%

3D numerical simulation of the flow of viscous newtonian and shear thinning fluids in a twin sigma blade mixer

Connelly

Kokini

2006

Adv Polym Technol

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ABSTRACT:The flow and mixing in a 3D geometrically accurate representation of a twin sigma blade mixer is simulated using the finite element method (FEM) combined with the mesh superimposition technique as implemented by Polyflow (Fluent, Inc.) to calculate the velocity, velocity gradients, shear rates, and mixing index. The mixing conditions and material models are based on those used in the laser-Doppler anemometry (LDA) experiments of Prakash and Kokini. The simulation results are analyzed to determine the effect of increasing shear thinning on the flow and mixing, and are also compared with the experimental results of Prakash and Kokini for the This is publication no. NJAES D10544-3-05 of the New Jersey Agricultural Experiment Station.

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mentioning

confidence: 72%

3D numerical simulation of the flow of viscous newtonian and shear thinning fluids in a twin sigma blade mixer

Connelly

Kokini

2006

Adv Polym Technol

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“…The most important advantage of this technique is the knowledge of the rheological properties in situ, as, for example, measuring torque values and applying the effective viscosity concept (Metzner and Otto, 1957). This classical method has been generally used for predicting the power consumption during the mixing of non-Newtonian fluids with different geometries Espinosa-Solares et al, 1997;Tanguy et al, 1997;Aubin et al, 2000;Wang et al, 2000;Thibault and Tanguy, 2002). It is a well-known fact that the Metzner-Otto constant, K s , which express the proportionality existing between the effective shear rate and the stirrer speed, depends on impeller geometry.…”

Section: Introductionmentioning

confidence: 99%

Mixing rheometry for studying the manufacture of lubricating greases

Franco

Delgado

Valencia

et al. 2005

Chemical Engineering Science

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“…For single helical impeller, K s value of 33 was used according to Tanguy et al (1997) whose impeller configuration was similar to the present one. From the knowledge of the speed of rotation, one can estimate the effective shear rate which in turn can be used to get the corresponding effective viscosity m a (Pa s), directly from the measured rheology data.…”

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confidence: 99%

Simultaneous saccharification and ethanol fermentation at high corn stover solids loading in a helical stirring bioreactor

Zhang

Chu

Huang

et al. 2009

Biotech & Bioengineering

234

162

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The higher ethanol titer inevitably requires higher solids loading during the simultaneous enzymatic saccharification and fermentation (SSF) using lignocellulose as the feedstock. The mixing between the solid lignocellulose and the liquid enzyme is crucially important. In this study, a bioreactor with a novel helical impeller was designed and applied to the SSF operation of the steam explosion pretreated corn stover under different solids loadings and different enzyme dosages. The performances using the helical impeller and the common Rushton impeller were compared and analyzed by measuring rheological properties and the mixing energy consumption. The results showed that the new designed stirring system had better performances in the saccharification yield, ethanol titer, and energy cost than those of the Rushton impeller stirring. The mixing energy consumption under different solids loadings and enzyme dosages during SSF operation were analyzed and compared to the thermal energy in the ethanol produced. A balance for achieving the optimal energy cost between the increased mixing energy cost and the reduced distillation energy cost at the high solids loading should be made. The potentials of the new bioreactor were tested under various SSF conditions for obtaining optimal ethanol yield and titer.

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Mixing performance induced by coaxial flat blade-helical ribbon impellers rotating at different speeds

Cited by 62 publications

References 6 publications

3D numerical simulation of the flow of viscous newtonian and shear thinning fluids in a twin sigma blade mixer

3D numerical simulation of the flow of viscous newtonian and shear thinning fluids in a twin sigma blade mixer

Mixing rheometry for studying the manufacture of lubricating greases

Simultaneous saccharification and ethanol fermentation at high corn stover solids loading in a helical stirring bioreactor

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