Flow and power characteristics of an axial discharge rotor-stator mixer

Minnick, Benjamin; Kim, Jung Won; Ko, Derrick I.; Calabrese, Richard V.

doi:10.1016/j.cherd.2018.05.015

Cited by 12 publications

(4 citation statements)

References 12 publications

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“…Turbulence was modelled using the standard k − model, which has been widely used for the simulation of rotor-stator mixers (Håkansson et al, 2017;Jasińska et al, 2015;Minnick et al, 2018;Mortensen et al, 2018;Özcan-Taşkın et al, 2011;Utomo et al, 2008Utomo et al, , 2009. All constants in the k and transport equations were left as their default values, and the standard wall function was employed to model near-wall viscosity-dependent effects.…”

Section: Cfd Modelmentioning

confidence: 99%

Linking power and flow in rotor-stator mixers

John

Panesar

Kowalski

et al. 2019

Chemical Engineering Science

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The relationship between power and flow characteristics of batch rotor-stator mixers has been studied using CFD simulations with experimental power validation. The mixer studied was the Silverson L5M batch mixer with the standard emulsor head. The size of the holes in the screen and the constriction of the base hole were changed in small increments. The MRF technique was used to model rotor rotation. A model is developed in this study which links the power and flow numbers of the mixer. Since power is easy to measure experimentally, one can use this model to predict the flow number by measuring torque. A second model is also developed which allows one to predict the flow number using solely the geometry of the mixing head. This study greatly enhances our understanding of the relationship between power, flow and mixer geometry in rotor-stator mixers.

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Section: Cfd Modelmentioning

confidence: 99%

Linking power and flow in rotor-stator mixers

John

Panesar

Kowalski

et al. 2019

Chemical Engineering Science

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“…In case of mixing in laminar regime, the effect of P L is negligible [6,16], hence, Equation (3) reduces to:…”

Section: Theorymentioning

confidence: 99%

“…Rotor-stator mixers are widely employed for the mixing of various fluids in the polymer, food, and pharmaceutical industries for the preparation of dispersions and homogenization or emulsification processes and can be used in the laminar and turbulent flow regimes and for batch or continuous (in-line) systems [1][2][3][4][5]. Rotor-stator mixers ensure a more efficient mixing process than conventionally used stirred vessels since the high rotor tip speed and a small clearance between the rotor and stator provide a high shear rate and energy dissipation rate, which improves the physical processes [1,[6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Power Input of an In-Line Rotor-Stator Mixer for Viscoplastic Fluids

2020

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In this work, the power draw and shear profile of a novel in-line rotor-stator mixer were studied experimentally and the laminar flow regime was simulated. The power draw of the rotor-stator mixer was investigated experimentally using viscoplastic shear-thinning fluid and the results of the obtained power consumptions were verified through simulations. The power draw constant and Otto-Metzner coefficient were determined from the result of experimental data and through simulations. A new method is suggested for the determination of the Otto-Metzner coefficient for the Herschel–Bulkley model and the term efficiency is introduced. It was shown that the proposed method can be applied successfully for the prediction of the Otto-Metzner coefficient for the mixing of viscoplastic shear-thinning fluids. The effect of geometry and rotor speed on power consumption and shear rate profile in the investigated mixer is discussed from the results of the simulations. It was found that numerical methods are a convenient tool and can predict the power draw of the in-line rotor-stator mixer successfully.

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“…[1,2,5]. This approach has become increasingly widespread and has recently been successfully applied to various designs of rotor-stator devices [6,7].…”

Section: Introductionmentioning

confidence: 99%

Substitution of equations for evaluation of energy consumption in rotor-stator mixers

Seminskyi

2022

Mech. Adv. Technol.

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In the presented publication, an attempt to develop the theory of mixing by considering rotor-stator mixers from the standpoint of mechanical mixing devices was made. The results of the research on energy consumption are given in the form of analytically substituted expressions for determining power and pressure difference as well as a flow rate in a stage of rotor-stator mixer composed of a pair of the perforated rotor and stator elements with a gap between them, depending on the features of the design, dynamic characteristics of the rotor and flows. The interrelationships between power, pressure difference, and flow rate in the stages of rotor-stator mixers are established. This makes it possible to define the characteristics of mixers, carry out their calculations and reasonably accept the rational design and processing parameters. The peculiarities of the components in obtained equations are indicated. Partial cases of the equations for power consumption in stages of rotor-stator-mixers operated in pulse and impulse modes are considered. The invariant form of obtained equations would help to ease the scaling of rotor-stator mixers.

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Flow and power characteristics of an axial discharge rotor-stator mixer

Cited by 12 publications

References 12 publications

Linking power and flow in rotor-stator mixers

Linking power and flow in rotor-stator mixers

Analysis of Power Input of an In-Line Rotor-Stator Mixer for Viscoplastic Fluids

Substitution of equations for evaluation of energy consumption in rotor-stator mixers

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