The shape and behaviour of a granular bed in a rotating drum using Eulerian flow fields obtained from PEPT

Morrison, Angus J.; Govender, I.; Mainza, A.N.; Parker, David J.

doi:10.1016/j.ces.2016.06.022

Cited by 40 publications

(22 citation statements)

References 28 publications

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“…It can take on one of a number of regimes such as slumping, rolling, cascading, cataracting and centrifuging. By measuring the flowing angle or speed, all of these regimes can be characterised (MiDi, 2004;Fischer et al, 2008;Morrison et al, 2016). For cohesive powders, determining these parameters is difficult due to the irregular surface of the flow and the lack of a continuous regime.…”

Section: Rotating Drummentioning

confidence: 99%

Cohesive Powder Flow: Trends and Challenges in Characterisation and Analysis

Ghadiri

Nan

Hare

et al. 2020

KONA

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Powder processing and manufacturing operations are rate processes for which the bottleneck is cohesive powder flow. Diversity of material properties, particulate form, and sensitivity to environmental conditions, such as humidity and tribo-electric charging, make its prediction very challenging. However, this is highly desirable particularly when addressing a powder material for which only a small quantity is available. Furthermore, in a number of applications powder flow testing at low stress levels is highly desirable. Characterisation of bulk powder failure for flow initiation (quasi-static) is well established. However, bulk flow parameters are all sensitive to strain rate with which the powder is sheared, but in contrast to quasi-static test methods, there is no shear cell for characterisation of the bulk parameters in the dynamic regime. There are only a handful of instruments available for powder rheometry, in which the bulk resistance to motion can be quantified as a function of the shear strain rate, but the challenge is relating the bulk behaviour to the physical and mechanical properties of constituting particles. A critique of the current state of the art in characterisation and analysis of cohesive powder flow is presented, addressing the effects of cohesion, strain rate, fluid medium drag and particle shape.

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Section: Rotating Drummentioning

confidence: 99%

Cohesive Powder Flow: Trends and Challenges in Characterisation and Analysis

Ghadiri

Nan

Hare

et al. 2020

KONA

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“…[ 2 ] introduced PEPT for engineering flow assessment. Since that time PEPT has been used to evaluate flow in milling equipment [ 3 ], hydrocyclones [ 4 ], and dishwashers [ 5 ], among other engineering apparatuses but has not been extensively used for biomedical purposes. The majority of PEPT evaluations have used the Birmingham method [ 2 ] and tracked a single particle.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional spatiotemporal tracking of fluorine-18 radiolabeled yeast cells via positron emission particle tracking

Langford¹,

Wiggins²,

Santos³

et al. 2017

PLoS ONE

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A method for Positron Emission Particle Tracking (PEPT) based on optical feature point identification techniques is demonstrated for use in low activity tracking experiments. A population of yeast cells of approximately 125,000 members is activated to roughly 55 Bq/cell by 18 F uptake. An in vitro particle tracking experiment is performed with nearly 20 of these cells after decay to 32 Bq/cell. These cells are successfully identified and tracked simultaneously in this experiment. This work extends the applicability of PEPT as a cell tracking method by allowing a number of cells to be tracked together, and demonstrating tracking for very low activity tracers.

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“…Research outcomes of the transverse solids motion in rotating cylinders can be used as references. Various types of behavior that a bed of solids can exhibit, as described by Mellmann, 28 Ding et al 38 and Morrison et al, 39 may similarly appear in a domestic tumble dryer. Textile motion in rotating drums will experience sliding, rolling, cascading, cataracting (falling) and centrifuging (rotating) under various drying conditions.…”

mentioning

confidence: 97%

“…A large number of researches have found that these modes are mostly determined by the Froude number (Fr, ! 2 R=g), the load fraction (f load , V m =V d ) and the critical wall friction coefficient ( w,c , 2 sin 3 25,26,29,39 The textile macroscale, at the level of a single textile piece, is concerned with the mixing textile interactions and the forces acting on textiles due to their dynamics in the rotating drum. Much of the work on the mixing behavior of particles is applicable at this scale, among which the most relevant chemical engineering processes are granular flow [40][41][42] and tumbling ball mills.…”

mentioning

confidence: 99%

Dynamics of cotton textile motion in a domestic tumble dryer and its effect on drying performance

Ding

2020

Textile Research Journal

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A high-speed video camera was used to track a tracer textile as it is tumbled among other textiles in a domestic tumble dryer under different operating conditions, with the aim of investigating the mechanisms by which the mechanical action is imposed on textiles and affects drying performance during drying. These mechanisms were first recognized by comparing the clothes drying process to other well-researched chemical engineering processes. From the observation of the recorded motion processes, cotton textile transverse motion can be divided into three categories and a motion index system was derived to characterize the type of motion undergone. The impact of textile transverse motion on drying performance was numerically discussed based on the results of an analysis of variance and regression analysis. Results indicated that textile dynamics with more complexity and flexibility tended to have more mixing, shortened distance of moisture migration inside the fabric layer and fewer wrinkles formed, resulting in higher potential to have a better drying performance.

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The shape and behaviour of a granular bed in a rotating drum using Eulerian flow fields obtained from PEPT

Cited by 40 publications

References 28 publications

Cohesive Powder Flow: Trends and Challenges in Characterisation and Analysis

Cohesive Powder Flow: Trends and Challenges in Characterisation and Analysis

Three-dimensional spatiotemporal tracking of fluorine-18 radiolabeled yeast cells via positron emission particle tracking

Dynamics of cotton textile motion in a domestic tumble dryer and its effect on drying performance

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