David Armour-Chelu
University of Greenwich
ParticleInductive sensorNuclear engineeringElectrical engineeringEngineeringElectrical contactsCharge densityHumidityRelative humidityChemical physicsComposite materialFlow measurementNanotechnologySuspension (vehicle)Pipeline transportChemistryParticle sizeCharge (physics)Materials scienceElectrostatic dischargeParticulatesAluminium oxideRubbingAluminium hydroxideRange (particle radiation)PopulationMeasurement testTest rigGranular materialCharged particleElectric chargePipeline (software)Active ingredientCoalMechanicsFlow (psychology)Mechanical engineeringTriboelectric effectElectric dischargePolarity (physics)
6Publications
6H-index
94Citations
Publications 6
Newest
#1Tariq Hussain (University of Greenwich)H-Index: 7
#2Tong Deng (University of Greenwich)H-Index: 14
Last. Waseem Kaialy (University of Wolverhampton)H-Index: 23
view all 6 authors...
Electrostatic charge due to inter-particle and particle-to-wall contacts may generate significant hazards during the processing of particulates within the pharmaceutical industry. Although charge behaviour of particulates is erratic and not easy to predict, it would be desirable to characterise the tendency of tribocharging prior to manufacturing. The work reported in this study concentrates on a new and novel technique for the detection of the active ingredient and excipient in a bipolar materi...
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#1Tariq Hussain (University of Greenwich)H-Index: 7
#2Waseem Kaialy (Medway School of Pharmacy)H-Index: 23
Last. David Armour-Chelu (University of Greenwich)H-Index: 6
view all 6 authors...
Electrostatic charge is generated during powder handling due to particle–particle and particle–wall collisions, rubbing, sliding, and rolling. In case of bipolar charge generation, the electrostatic forces may significantly change the inner forces and increase powder adhesion and cause a serious problem in material handling process. Therefore, the knowledge of distribution of charge across the individual particles is helpful to identify the role of triboelectrification and the effects of various...
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#1Stephen WoodheadH-Index: 1
#2John Denham (University of Greenwich)H-Index: 1
Last. David Armour-Chelu (University of Greenwich)H-Index: 6
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This paper describes the development of a number of electric charge sensors. The sensors have been developed specifically to investigate triboelectric charge transfer which takes place between particles and the pipeline wall, when powdered materials are conveyed through a pipeline using air. A number of industrial applications exist for such gas–solids pipelines, including pneumatic conveyors, vacuum cleaners and dust extraction systems. The build-up of electric charge on pipelines and powdered ...
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#1Steve Woodhead (University of Greenwich)H-Index: 11
#2David Armour-Chelu (University of Greenwich)H-Index: 6
Abstract This paper reports work undertaken to explore the influence of air relative humidity, temperature and particle size on the electric charging characteristics of particulate aluminium hydroxide during transport in a pneumatic pipeline. Limited data with regard to the influence of flow suspension density and velocity is also reported. Values of air relative humidity from 35% to 50% and temperatures of 19°C and 30°C are investigated, along with mean particle sizes ranging from 49 to 98 μm. ...
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#1David Armour-Chelu (University of Greenwich)H-Index: 6
#2Steve Woodhead (University of Greenwich)H-Index: 11
Abstract The charging trends of particulate materials in gas–solid flows in pipelines are of considerable interest to designers of such flow systems, particularly with regard to flow instruments based on electrostatic measurement principles. Such data may also be useful to other researchers in associated fields. The authors of this paper, therefore, set about obtaining such data empirically. In order to achieve this, a small-scale test rig was designed incorporating a 26.5 mm bore pipeline, part...
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#1David Armour-Chelu (University of Greenwich)H-Index: 6
#2Steve Woodhead (University of Greenwich)H-Index: 11
Last. R.N. Barnes (University of Greenwich)H-Index: 1
view all 3 authors...
The charging of particulate materials due to contact with the inside surface of a pipeline wall (triboelectrification) during pneumatic conveying is common in bulk solids handling equipment. Electrostatic discharge from particulate materials in a transport line can lead to fire and explosion hazards. Conversely, the phenomenon of electrostatic charge can be utilized to measure particle flow. At present there is only a very limited amount of experimental data available to describe the triboelectr...
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