Positron emission particle tracking studies of spherical particle motion in rotating drums

Parker, D.J.; Dijkstra, A.E.; Martin, Thomas W.; Seville, Jonathan

doi:10.1016/s0009-2509(97)00030-4

Cited by 248 publications

(152 citation statements)

References 7 publications

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“…6, but the low level base values indicate intermittent dynamics with jamming and un-jamming events occurring successfully. , 1997;De Richter et al, 2012;Jain et al, 2002;Katsuragi et al, 2010). We determined the same trend for all studied rotational speeds as can be seen in Fig.…”

Section: Powder Casupporting

confidence: 54%

“…Even then, the spatial resolution is not fine enough for them to distiguish collisions between the grains. This limitation holds for other imaging techniques as well, like positron emission particle tracking (PEPT) (Lim et al, 2003;Parker et al, 1997), magnetic resonance imaging (MRI) (Nakagawa et al, 1993;Yamane et al, 1998), and X-ray microtomography (Seidler et al, 2000). Furthermore, none is fast enough to capture the high rates of the micro-collision of grains in the passive bed located in the lower part of the rotating tumbler.…”

Section: Inroductionmentioning

confidence: 99%

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Granular dynamics of cohesive powders in a rotating drum as revealed by speckle visibility spectroscopy and synchronous measurement of forces due to avalanching

Yang

Jiang

Saw

et al. 2016

Chemical Engineering Science

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We have used speckle visibility spectroscopy (SVS) and synchronized force measurements to compare the granular dynamics of two cohesive lactose powders, with Sauter mean diameters of ~29 μm and ~151 μm, in a rotating drum. A load cell (LC) was used to measure forces on the drum mounting frame and enable monitoring of bulk powder motion; SVS is a dynamic light scattering technique particularly suited for studying dynamics in dense, non-ergodic granular systems. Our results reveal that surface slumping and intermittent collisional dynamics in the bulk of the bed are correlated, especially for the fine more cohesive particles (Geldart group C/A boundary), but not as much for the less cohesive larger particles (Geldart group A/B boundary). The specific dissipation energy of the particles in the drum is similar for both powders, and increases linearly with increasing drum speed. However, the dependencies of the load cell and SVS signals on rotation speed have opposing trends for these two powders, indicating different dissipation mechanisms for the different Geldart Groups; collisional dissipation is more important for the Geldart C/A powder, while for the Geldart A/B powder avalanche dissipation is dominant.

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Section: Powder Casupporting

confidence: 54%

Section: Inroductionmentioning

confidence: 99%

Granular dynamics of cohesive powders in a rotating drum as revealed by speckle visibility spectroscopy and synchronous measurement of forces due to avalanching

Yang

Jiang

Saw

et al. 2016

Chemical Engineering Science

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“…Several experimental techniques have been developed to measure and analyze particle motions in the gas-solid fluidized bed. Parker et al [25] applied positron emission particle tracking (PEPT) to obtain the particle moving trajectories, particle velocity and circulation pattern within the bed, which has been successfully applied in bench-scale fluidized beds, wurster fluidized beds [26] and rotating drums [27]. Mostoufi et al [28] measured the axial and radial diffusion coefficients of particles in the fluidized bed by radioactive particle tracking (RPT) technique.…”

Section: Introductionmentioning

confidence: 99%

Monitoring of particle motions in gas-solid fluidized beds by electrostatic sensors

Yang

Zhang

et al. 2017

Powder Technology

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A C C E P T E D M A N U S C R I P TACCEPTED MANUSCRIPT Electrostatic charge signals in the fluidized bed contain much dynamic information on particle motions, which are poorly understood and explored. In this work, correlation velocities of Geldart B and D particles were measured, analyzed and compared by induced electrostatic sensors combined with cross-correlation method in the fluidized bed. The results indicated that the average correlation velocity of particle clouds increased and the normalized probability density distributions of correlation velocities broadened when the superficial gas velocity increased in the dense-phase region. Both upward and downward correlation velocities could be acquired in the dynamic bed level region. Under the same excess gas velocity, the average correlation velocity of Geldart D particles was significantly smaller than that of Geldart B particles, which was caused by the smaller bubble sizes caused by the dominant bubble split over coalescence and less volume of A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT 2 gas forming bubbles for Geldart D particles. The experimental results verified the reliability and repeatability of particle correlation velocity measurement by induced electrostatic sensors in the gas-solid fluidized bed, which provides definite potential in monitoring of particle motions.

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“…The granule strength is determined by single granule compression and cr ushing between two platens known as the side crushing test. The macroscopic flow field of the granulators as a function of scale is also investigated using the Positron Emission Particle Tracking (PEPT) facility of the University of Birmingham [26][27][28] and high-speed video recording and image analysis to measure particle motion at the single particle level. In order to provide a mean to interpret the experimental observations, modelling work across the length scale is carried out at macroscopic and microscopic levels.…”

Section: Introductionmentioning

confidence: 99%

Scale-up of High-Shear Mixer Granulators

Rahmanian

Hassanpour

et al. 2008

KONA

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Positron emission particle tracking studies of spherical particle motion in rotating drums

Cited by 248 publications

References 7 publications

Granular dynamics of cohesive powders in a rotating drum as revealed by speckle visibility spectroscopy and synchronous measurement of forces due to avalanching

Granular dynamics of cohesive powders in a rotating drum as revealed by speckle visibility spectroscopy and synchronous measurement of forces due to avalanching

Monitoring of particle motions in gas-solid fluidized beds by electrostatic sensors

Scale-up of High-Shear Mixer Granulators

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