IMFTF Keynote Meeting (14) Schedule
Date & Time: Wed, 23 Nov. 2022, 19:30
Chair:
Professor Raffaella Ocone, Heriot-Watt University, UK
Opening:
(19:30-19:35 Beijing Time)
Programme:
Keynote Speech
(19:35 – 20:15 Beijing Time)
Professor Mojtaba Ghadiri
University of Leeds
Q&A
(20:15 – 20:55 Beijing Time)
Discussions, closing
(20:55 – 21:00 Beijing Time)
TBD
Platform: Zoom
https://us02web.zoom.us/j/89280772070?pwd=cG1IWEVvejdUdUVjQVMzTHpPVjQ0UT09
Meeting ID: 892 8077 2070
Passcode: 1123
Organizer
International Multiphase Flow Technology Forum
China University of Petroleum-Beijing
Chinese Society of Particuology
View Live
Channel(视频号)
Bilibili(b站)
Keynote Speech
Triboelectrification of Powders and Grains: Effect of Surface Functional Groups
Mojtaba Ghadiri
Professor
University of Leeds, School of Chemical and Process Engineering, UK
Conveying, handling and processing of powders and grains could give rise to tribo-electrification, causing segregation and adhesion of particles to the containing walls and, in extreme cases, fire and explosion. Prediction of charge transfer is highly challenging. Its measurement is also prone to charge leakage, thereby leading to underestimating the charge content of a given material.
In this presentation, a novel method of measurement of charge transfer by aerodynamic dispersion is introduced: a simple and fast experimental technique, in which the net charge on the particles is measured immediately following dispersion of the particles by a pressure pulse of air. The technique has been extensively analysed and recently used to study of the effect of surface functional groups on tribo-electric charging. For this purpose, the surfaces of glass beads are made hydrophilic by acid washing or hydrophobic by silanisation. They are then coated with aluminium mono-, di-, or tri--stearates to investigate the effectivity of the aluminium ion in such structures on charge transfer. The functionalised and also aluminium-stearate-coated surfaces are charged by collisions against stainless steel, copper, aluminium and PTFE surfaces providing a portfolio of charge transfers for consideration by triboelectric series. Some surprising trends are observed which will be reported.
References:
Ali, M. and Ghadiri, M., (2017). Analysis of triboelectric charging of particles due to aerodynamic dispersion by a pulse of pressurised air jet. Advanced Powder Technology, 28(10), pp.2735-2740.
Zafar, U., Alfano, F. and Ghadiri, M., (2018). Evaluation of a New Dispersion Technique for Assessing Triboelectric Charging of Powders. International journal of pharmaceutics, 543(1-2), pp.151-159.
Alfano, F.O., Di Renzo, A., Di Maio, F.P. and Ghadiri, M. 2021. Computational analysis of triboelectrification due to aerodynamic powder dispersion. Powder Technology. 382, pp.491–504.
Speaker Information
Education：
BSc, Faculty of Engineering, University of Tehran
MSc, Imperial College London
PhD, Cambridge
Awards：
• Iinoya Award 2010 for international cooperation, the Society of Powder Technology, Japan
• Kona Award 2019 for contributions to research on powders, particle science and technology, Japan
• Chemistry for Industry Award of the Society of Chemical Industry, UK
Work Experience:
• Scientist, Unilever Research, Port Sunlight
• Lecturer, Reader, Professor of Particle Technology, University of Surrey
• Shell Research, Amsterdam, Visiting Scientist
• ERC University of Florida, Visiting Professor
• Professor of Chemical Engineering, University of Leeds
• Head of Institute of Particle Science and Engineering, University of Leeds
• University of Salerno, Visiting Professor
• University of Calabria, Visiting Professor
• Consultant of the International Fine Particle Research Institute in the size reduction area
Selected Publications:
2021 Publications:
• Alfano, F.O., Di Renzo, A., Di Maio, F.P. and Ghadiri, M. 2021. Computational analysis of triboelectrification due to aerodynamic powder dispersion.
Powder Technology. 382, pp.491–504.
• Bhonsale, S., Scott, L., Ghadiri, M. and Van Impe, J. 2021. Numerical Simulation of Particle Dynamics in a Spiral Jet Mill via Coupled CFD-DEM.
Pharmaceutics. 13(7).
• Bonakdar, T., Ali, M. and Ghadiri, M. 2021. Particle breakability assessment using an Aero S disperser. International Journal of Pharmaceutics.
597(120365).
• Calvert, G., Ahmadian, H. and Ghadiri, M. 2021. Analysis of contact force distribution in a moving granule bed subjected to shear deformation by a set of rollers. Advanced Powder Technology. 32(8), pp.3016–3022.
• Goh, W.P., Sanavia, A.M. and Ghadiri, M. 2021. Effect of Mixer Type on Particle Coating by Magnesium Stearate for Friction and Adhesion Modification. Pharmaceutics. 13.
• Hare, C., Ghadiri, M. and Wu, C.-Y. 2021. Discrete element modelling of ribbon milling: A comparison of approaches. Powder Technology. 388, pp.63– 69.
• Nan, W., Pasha, M. and Ghadiri, M. 2021. Rheology of a dense granular bed penetrated by a rotating impeller. Powder Technology. 386, pp.60–69.
• Nezamabadi, S., Ghadiri, M., Delenne, J.Y. and Radjai, F. 2021. Modelling the compaction of plastic particle packings. Computational Particle Mechanics.
• Sardar, S., Kale, G. and Ghadiri, M. 2021. Microstructure and impedance spectroscopy of high density holmium hafnate (Ho2Hf2O7) from nanoparticulate compacts. Materials Science and Engineering: B. 265(114989).
• Scott, L., Borissova, A., Burns, A. and Ghadiri, M. 2021. Influence of holdup on gas and particle flow patterns in a spiral jet mill. Powder Technology. 377, pp.233–243.
• Zafar, U., Hare, C., Hassanpour, A. and Ghadiri, M. 2021. Assessing powder flowability at low stresses using ball indentation method: Evaluation of constraint factor. Powder Technology. 387, pp.287–294.
For more details of the current projects, collaborators and publications please see the
Group’s web page: http://ghadiri-group.leeds.ac.uk/
Email:
m.ghadiri@leeds.ac.uk
