Finite element modeling of the laminar and transition flow of the Superblend dual shaft coaxial mixer on parallel computers

Rivera, Christian; Heniche, Mourad; Takenaka, Katsuhide; Tanguy, Philippe A.

doi:10.1016/j.ces.2009.07.022

Cited by 32 publications

(29 citation statements)

References 29 publications

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“…Fig. Compared to a pitched-blade turbine [22] and Superblend mixer [4], the EG impeller forms more uniform shear rates over a wide range of Reynolds numbers. The shear number of the EG impeller is less sensitive to Re, while that of the DHR impeller depends significantly on Re.…”

Section: Shear Ratementioning

confidence: 99%

“…2 indicates a good agreement between the numerical results of the power number and the experimental measurements for EG and DHR impellers. The K p for the EG impeller is about 190, which is between the K p (110-140) for a Superblend coaxial mixer [4] and the K p (190-215) for a Maxblend impeller [20]. Re is often used to represent power and mechanical requirements of the drive.…”

Section: Power Consumptionmentioning

confidence: 99%

“…It is defined as [4]: This always limits the design and selection of an impeller system for this kind of fermentation.…”

Section: Shear Ratementioning

confidence: 99%

“…Various new impellers have been designed to meet this need [3,4]. Both standard impellers such as turbines, paddles, or hydrofoils and largescale impellers such as helical screw or helical ribbon cannot manage this large range of flow regimes.…”

Section: Introductionmentioning

confidence: 99%

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Hydrodynamics Characterization of an Ellipse Gate Impeller by Experimental and Numerical Studies

Xie

Xia

Zhou³

et al. 2012

Chem Eng & Technol

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Hydrodynamics characteristics like flow pattern, shear rate distribution, power consumption, axial pumping capacity, mixing time, and mixing efficiency of an ellipse gate (EG) impeller were investigated by experimental and numerical methods. The numerical simulation results were validated by experimental data of power consumption and mixing time. Results indicate that the axial pumping number of the EG impeller is larger than that of any other reported large-scale impeller under laminar regime, and that the shear rate formed by this impeller is less sensitive to Reynolds numbers. In-depth analysis reveals the different function of each part of the EG impeller under different flow regimes. This impeller provides an almost similar mixing efficiency like the double-helical ribbon impeller under laminar regime, but much higher mixing efficiency both under transitional and turbulent flow regimes.

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Section: Shear Ratementioning

confidence: 99%

Section: Power Consumptionmentioning

confidence: 99%

“…It is defined as [4]: This always limits the design and selection of an impeller system for this kind of fermentation.…”

Section: Shear Ratementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hydrodynamics Characterization of an Ellipse Gate Impeller by Experimental and Numerical Studies

Xie

Xia

Zhou³

et al. 2012

Chem Eng & Technol

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“…Large agitators are usually provided with wide paddles (Bertrand et al, 1999;Iranshahi et al, 2007;Rivera et al, 2009) that promote strong flow circulations and dispersion of solid phase. Also some large impellers are equipped with grids that can induce folding of fluid elements.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic Characterization of Three Axial Impellers under Gassed and Ungassed Conditions

Mancilla

Yatomi

Zenit

et al. 2016

J. Chem. Eng. Japan / JCEJ

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We investigate the hydrodynamic performance of a ba ed stirred tank for an air-water system in the turbulent regime. Comparisons among three di erent axial impellers were conducted: Maxblend impeller, two coaxial Pitched Blade Turbine (down-pumping mode) and two coaxial Intermig impellers. Measurements of the mean velocity eld and the power consumption for gassed and ungassed conditions were obtained. The gas phase was introduced in a controlled manner using a capillary bank mounted at the bottom of the tank. The measured distributions of turbulent intensities for each impeller system for both gassed and ungassed con gurations showed signi cantly di erent distributions. The ow patterns were also drastically modi ed for gassed conditions for the conventional agitators. The Maxblend impeller was observed to maintain a certain degree of homogeneity in the turbulent distribution for both gassed and ungassed conditions.

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CFD investigation of new helical ribbon mixers bottom shapes to improve pumping

Sanjuan-Galindo

Heniche

Ascanio

et al. 2011

Asia-Pacific J Chem Eng

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It is well known that helical ribbon (HR) impellers exhibit poor bottom pumping properties. Three different HR impeller geometries, varying in their bottom design, are compared in terms of their mixing performance. Particular emphasis is given to the improvement of pumping capabilities. The selected bottom geometries were a standard bottom termination, an anchor-type termination and a paddle-type termination. The investigation was based on the use of 3D finite-element simulation to assess the hydrodynamics and mixing performance using various distributive and dispersive criteria. Analysis of Poincaré maps showed that an HR with a paddle-type termination operating in a down-pumping mode offered the best performance. 

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Finite element modeling of the laminar and transition flow of the Superblend dual shaft coaxial mixer on parallel computers

Cited by 32 publications

References 29 publications

Hydrodynamics Characterization of an Ellipse Gate Impeller by Experimental and Numerical Studies

Hydrodynamics Characterization of an Ellipse Gate Impeller by Experimental and Numerical Studies

Hydrodynamic Characterization of Three Axial Impellers under Gassed and Ungassed Conditions

CFD investigation of new helical ribbon mixers bottom shapes to improve pumping

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