Predicting the impact of adhesive forces on particle mixing and segregation

Figueroa, I.; Li, Hongming; McCarthy, Joseph J.

doi:10.1016/j.powtec.2009.06.002

Cited by 21 publications

(17 citation statements)

References 36 publications

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“…8 It can also lead to the appearance or modification of segregation patterns that are different from the ones in noncohesive cases. [9][10][11] In order to study and characterize the interparticle force effects on granular flow dynamics, different approaches have been used to introduce cohesive forces into the particulate material.The interparticle force can be chosen to reproduce the conditions found in a real process (e.g., the use of capillary force to study its impact on a wet granulation process), but also to mimick, in a more friendly environment, the cohesive behavior present in a granular application difficult to characterize with experimental measurements because of extreme operating conditions. Fluid beds that operate at high temperature are an example of one such application for which the characterization is limited to optical observations of the process.…”

Section: Introductionmentioning

confidence: 99%

Control of particle cohesion with a polymer coating and temperature adjustment

et al. 2012

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A new approach is presented that introduces interparticle forces induced by a change of temperature at which polymer coated particles are exposed. The particle cohesive flow behavior is shown for two different applications. The first one considers a dense granular flow that is typically observed for wet powder granulation using a modified spheronizer. The other application shows the possibility of mimicking the particle flow behavior observed in high‐temperature fluidized beds with the advantage of being operated at ambient conditions. For the first application, as the temperature increases, significant changes in the particle bed surface morphology were observed and an important reduction of the dynamic density was noticed. For the gas–solid fluidized‐bed application, pressure drop measurements revealed that the behavior of the particles transited from Geldart group B to Geldart group A and even Geldart group C as the temperature increased. © 2012 American Institute of Chemical Engineers AIChE J, 2012

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Section: Introductionmentioning

confidence: 99%

Control of particle cohesion with a polymer coating and temperature adjustment

et al. 2012

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“…5 Nonsymmetric Particle Rotation. To simulate nonsymmetric particles, it is necessary to know the orientation of each particle Figure 5.…”

Section: Simulation Methodologymentioning

confidence: 99%

Using Janus Particles to Control Mixing and Segregation of Adhesive Particle Systems

Figueroa

McCarthy

2010

Ind. Eng. Chem. Res.

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Processing of fine powders is a relevant operation in many industries, from pharmaceuticals to material synthesis. As the size of the particles decreases, adhesive forces become important and can have a nontrivial, but difficult to predict, impact on the mixing/segregation tendency of the material. The aim of this work is to control the final asymptotic state of adhesive systems through the addition of "helper" particles that can either promote mixing or segregation. These amphiphilic "helper" particlessalso called Janus particlessact as bridges between particles, alternatively promoting mixing in a system that would otherwise segregate (surfactant particles) or separating a specific kind of particle from a mixture (extractant particles). Phasespace diagrams of the expected behavior are analytically identified by comparing the interaction forces in the system: the strengths of those that promote mixing are compared with the ones that enhance segregation (including those interactions bridged by Janus particles), and the final state of the system is determined by the interactions that predominate. The predictions are then tested against results obtained by two-dimensional discrete element method (DEM) simulations of the system including Janus particles, which are further compared to both the binary adhesive system and the free-flowing case.

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“…By manipulating particle properties such as changing the particle size distribution and/or optimising the bulk cohesion, it is possible to reduce segregation [4, 21,22]. Jain et al [23] showed that the segregation of both binary and ternary mixtures of glass beads with different sizes could be reduced in vertically vibrated cylinders by slightly increasing the size distribution of each species or by increasing the mass fraction of the intermediate size specie…”

Section: Accepted Manuscriptmentioning

confidence: 99%