Measurement of Velocity Distribution in the Brabender Farinograph as a Model Mixer, Using Laser‐doppler Anemometry

Prakash, Subbalakshmi; Karwe, Mukund V.; Kokini, Jozef L.

doi:10.1111/j.1745-4530.1999.tb00498.x

Cited by 20 publications

(17 citation statements)

References 6 publications

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“…In case of 0.11% Carbopol, this tendency is stronger than for 2% CMC, which is expected since it is more shear thinning. The effect of shear thinning seen on the simulated velocity fields corresponds with the findings of Prakash et al, 7 who used LDA to experimentally determine the velocity fields. For example, on the vertical center plane, both the simulation x velocity component results in Fig.…”

Section: −28supporting

confidence: 74%

“…2b. This flow reversal can be seen in the axial velocity LDA experimental results in Prakash et al 7 In the open area of the bowl above the blades, in the 180…”

Section: −28mentioning

confidence: 79%

“…For example, on the vertical center plane, both the simulation x velocity component results in Fig. 3b and the experimental x velocity component results in Prakash et al 7 at the 180 • /270…”

Section: −28mentioning

confidence: 83%

“…with a flow behavior index of n = 0.397 and a consistency coefficient of K = 157.4 poise · s n − 1 as listed in Prakash et al 7 Note that the shear rate in 3D flows (γ ) is defined as the magnitude of the rate of deformation tensor:γ…”

Section: Problem Description and Mesh Developmentmentioning

confidence: 99%

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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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Section: −28supporting

confidence: 74%

“…2b. This flow reversal can be seen in the axial velocity LDA experimental results in Prakash et al 7 In the open area of the bowl above the blades, in the 180…”

Section: −28mentioning

confidence: 79%

Section: −28mentioning

confidence: 83%

Section: Problem Description and Mesh Developmentmentioning

confidence: 99%

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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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“…Christie et al [6] have analysed flow of a slightly non-Newtonian fluid between eccentric rotating cylinders. Prakash and Kokini [16,17,18] studied the shear-rate and velocity distribution in a model mixer using Laser-Doppler Anemometry (LDA).…”

Section: Introductionmentioning

confidence: 99%

Modelling three‐dimensional rotating flows in cylindrical‐shaped vessels

Sujatha

Webster

2003

Numerical Methods in Fluids

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This paper reports on a study concerned with the numerical simulation of dough kneading that arises in the food processing industry. The flows considered are in a complex domain setting. Two dough mixers running at various rotation speeds are studied; one with a single stirrer, the other with two stirrers.Stirrers are fixed on the lid of the vessel and the motion is driven by the rotation of the outer vessel. Two different mixer orientations are considered, generating horizontal or vertical-rotating flow fields. Three-dimensional numerical simulations are performed on the full flow equations in a cylindrical polar co-ordinates system, through a finite-element, semi-implicit time stepping, Taylor-Galerkin pressure-correction scheme. The results reflect excellent agreement against the equivalent experimental findings. The motivation for this work is to develop advanced technology to model the kneading of dough. The ultimate target is to predict and adjust the design of dough mixers, so that optimal dough processing may be achieved notably, with reference to local rate-of-work input.

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Distributive mixing in a corotating twin screw channel using Lagrangian particle calculations

Xu¹,

Yu²,

Turng

2017

Adv Polym Technol

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This work is devoted to the development of a new mapping method for the numerical simulation of melt flow in the complicated forward conveying element of a corotating twin screw extruder under the assumption of periodic boundary conditions of inlet and outlet. The mesh superposition technique (MST) provided by the commercial computational fluid dynamics (CFD) software POLYFLOW was used to deal with the internal moving screw elements, and the flow field of polymer melt obeying the Bird-Carreau constitutive model on the fixed meshes of the flow domain was further solved. After inputting the exported data of the flow field from POLYFLOW, the self-developed code was further used to characterize the mixing behavior at a finite time under different rotation speeds of the screw elements. A novel mapping method was proposed to convert the instantaneous flow field at the initial time pointinto the velocity field at any time point. Advection evolution of passive particle groups was simulated by a fourth-order Runge-Kutta tracking method, and the corresponding variance index was also calculated. The effect of screw rotation speed on distributive mixing was examined. The results showed that the mixing was highly dependent on the initial position whether the particle groups were first placed close to or far away from the intermeshing zone. K E Y W O R D Scomputer modeling, extrusion, mixing, simulation

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Measurement of Velocity Distribution in the Brabender Farinograph as a Model Mixer, Using Laser‐doppler Anemometry

Cited by 20 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

Modelling three‐dimensional rotating flows in cylindrical‐shaped vessels

Distributive mixing in a corotating twin screw channel using Lagrangian particle calculations

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