Computer simulation model of a Nauta mixer

Bergh, W.J.B. van den; Scarlett, B. Florence; Kolář, Z.

doi:10.1016/0032-5910(93)85003-r

Cited by 8 publications

(3 citation statements)

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“…In other words, the free surface rises where the impeller exists and falls in the opposite side of the blender. This pattern was also observed by Fan and Chen [28] and van den Bergh and Scarlett [32]. Since the sweeping rotation is anticlockwise, the screw agitates the red particles initially which leads to higher level of particle in this region.…”

Section: Nauta Blender Simulation Resultssupporting

confidence: 74%

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Granular mixing in nauta blenders

et al. 2017

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Flow pattern of particles and their mixing performance in a Nauta blender were studied using the discrete element method. The model was validated by experimental data obtained in a convective conical screw blender and good agreement was obtained. Flow pattern of particles was studied through velocity profiles, granular temperature and streamlines of particles. Effects of sweeping rotation speed, primary rotation speed and impeller diameter on the mixing quality and mixing rate were studied. A vertical circulation pattern in the blender was observed due to the primary rotation of the impeller that produced a convective and layered flow. In this pattern, particles are lifted to the bed surface and then descend at the opposite side of the screw. On the other hand, the sweeping rotation of the impeller pushes the particles along the direction of sweeping which leads to a tangential flow of particles. Combination of primary and sweeping rotations of the impeller results in a three dimensional particle mixing. A semi-stagnant zone is also formed temporarily near the cone axis. It was found that increasing the primary rotation speed (from 5 to 10 rad/s) and impeller diameter

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Section: Nauta Blender Simulation Resultssupporting

confidence: 74%

“…A production scale Nauta blender (3 m 3 ) and 0.2 and 0.3 mm particles were used for this purpose. Van der Bergh and Scarlett [32] conducted a set of experiments in a Nauta blender. The particles used in their work were 0.65 mm silica sand and the volume of the blender was 120 liter.…”

Section: Introductionmentioning

confidence: 99%

Granular mixing in nauta blenders

et al. 2017

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“…Radioactive particle tracking was employed in a Nauta mixer by van den Bergh [41] to study residence times and flow velocities in different regions of the mixer using Iodine 128 as the tracer particle. A Scandium 46 tracer was employed by Doucet et al [42] to study the velocity profile in a V-blender and results were used to validate simulation models.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Review of noninvasive methods to characterize granular mixing

Nadeem

Heindel

2018

Powder Technology

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Granular mixing is a common process observed in a variety of industries such as construction, chemical processing, food handling, and cosmetics and pharmaceutical manufacturing. Over the years several methods have been devised to characterize granular mixing and to provide information on the quality of the mixture as well as mixing end points. In this work, three different noninvasive measurement categories are reviewed, namely: velocimetric, spectroscopic, and tomographic techniques. Velocimetric techniques such as Particle Image Velocimetry (PIV) and Radioactive particle tracking (RPT) are able to provide the trajectories and velocities of individual particles during the mixing process. Spectroscopic techniques focus on the chemical composition of the sample and are well suited for applications where there is little difference in the physical properties of the constituents such as particle size and density. Tomographic techniques such as X-ray computed tomography (CT) and Magnetic Resonance Imaging (MRI) provide information such as the spatial distribution of the different constituents in the sample and are useful in determining dead zones and inhomogeneities. A few other techniques are also discussed, particularly passive acoustic methods which, though can neither provide spatial distribution nor individual particle trajectories, are still useful and can be employed to determine mixing end points. The objective of the work is to provide a comparative assessment of the various noninvasive techniques and discuss their ability to effectively characterize the mixing process. The reported techniques will be reviewed thoroughly based on their functionality, viability, and characterization capability. The advantages and disadvantages of the various techniques are summarized and a comparison of the utility of the techniques in various applications is discussed.

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Synthesis of bulk solids processing systems

Wibowo

1999

AIChE Journal

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Computer simulation model of a Nauta mixer

Cited by 8 publications

References 1 publication

Granular mixing in nauta blenders

Granular mixing in nauta blenders

Review of noninvasive methods to characterize granular mixing

Synthesis of bulk solids processing systems

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