IMA Conference on Dense Granular Flows
Date: Monday 5 - Friday 9 January 2009 Location: Issac Newton Institute, Cambridge Videos of the talks are available at http://sms.cam.ac.uk/collection/521697. Flows involving solid particulates are ubiquitous in nature and industry alike. Such flows are found in pharmaceutical production, the chemical industry, the food and agricultural industries, energy production and the environment. Many unsolved problems remain, however. For example, the rejection rate by US pharmaceutical manufacturers is around 5% with the cost of losing a single batch of medication ranging from £50,000 to £500,000. In order to be able to solve such problems, granular flows need to be understood so that their behaviour can be controlled and predicted. To date, we are able to describe rapid granular flows, where the particles are highly agitated and there has been some success describing static systems. The intermediate regime, where these two phases meet and coexist, is not as well understood and yet is the most commonly observed behaviour of granular flow. The objective of this meeting will be to interface the two ends of the particulate flow spectrum – those working to understand the fundamentals of granular flows and those attempting to control particulate flows in an industrial setting - to develop solutions to the complex problems presented by dense granular flows.Organising Committee
Ricky Wildman, Loughborough University (Chair) Nico Gray, University of Manchester Jonathon Huntley, Loughborough University Jim McElwaine, University of Cambridge Christine Hrenya, University of Colorado, USAInvited Speakers
Bob Behringer, Duke University, North Carolina, USA Statistics of Dense Granular Materials Abstract: Dense granular materials present a number of interesting challenges. They are many-body systems with dissipative interactions. As suggested by Edwards et al., one would like to have a statistical approach analogous to Boltzmann statistics for energy-conserving systems. But the dissipative character of dense granular materials challenges conventional notions. New approaches require a careful examination, and suggest a number of experiments. This talk will focus on recent experiments that seek to characterize the statistics of dense granular systems and to test recent models. In particular, we have carried out experiments to determine the microscopic distributions of contact forces, the nature of jamming, the effect of stress anisotropy, the role of affine and non-affine motion in sheared granular systems, the effect of particle rotation, and the importance of particle shape. Many of these experiments use photoelastic particles. This allows the tracking of particle motion, and perhaps most importantly, the determination of the contact forces by the solution of a nonlinear inverse problem. Our results are consistent with predictions from the force ensemble approach, but much more needs to be done. Thomas C. Halsey, ExxonMobil Upstream Research, Houston, Texas Motion of frictional grain packings Jim Jenkins, Cornell University, USA Dense Granular Flows Down Inclines Abstract: We'll show how kinetic theory, slightly extended to include an additional length scale in the rate of collisional dissipation that is associated with clusters and/or correlated collisions, can predict the observed features of inclined flows of inelastic, frictional spheres over a rigid bumpy base in the absence of side walls and over the surface of a heap when side walls are present. Biography: James T. Jenkins is the Walter S. Carpenter, Jr. Professor of Engineering in the Department of Theoretical and Applied Mechanics at Cornell University. His recent research has focused on the formulation of constitutive relations for dense, dissipative, collisional flows; analytical descriptions of debris flows; and the modeling of wind-blown sand. Raffaella Ocone, Department of Chemical Engineering, Heriot-Watt University Investigating the Intermediate Granular Flow Regime Biography: Raffaella Ocone is Professor of Chemical Engineering at Heriot-Watt University, Edinburgh, UK. She received her MEng in Chemical Engineering from the University of Naples, Italy, and MA and PhD from Princeton University, USA. She was elected Fellow of the Royal Society of Edinburgh in 2006 and Cavaliere of the Order of Merit of the Italian Republic in 2007. She is a Chartered Engineer, a Chartered Scientist and a Fellow of the Institution of Chemical Engineers. Her research interests are in modelling complex systems, spanning from the hydrodynamics of solid/gas suspensions, to complex reaction networks. Recent work includes the modelling of biological systems. Dr Philippe Rogueda FRSC CChem CSci EurIng, Novartis UK Multiphase flow enigmas in inhalation delivery Biography: Philippe Rogueda is a world expert on formulation science, especially on the formulation of medicinal aerosols. His expert lies in the field of colloid and physical chemistry, in relation to particle engineering and non aqueous formulations. Professor Jonathan Seville, School of Engineering, University of Warwick Granular Flows at the Single Particle Level Biography: Jonathan Seville is Dean of Engineering at the University of Warwick, UK. He holds degrees in Chemical Engineering from the Universities of Cambridge and Surrey and has held visiting appointments at the University of British Columbia and the Technical University of Denmark. He is a Chartered Engineer, a Fellow of the Institution of Chemical Engineers and a Fellow of the Royal Academy of Engineering. His research includes a wide range of solids processing activities, including particle formation, agglomeration, compaction and coating; fluidisation and reactor design; positron emission particle tracking; discrete element method modelling; and supercritical fluid processes.
Posters (during Tuesday afternoon coffee break)
Mathematical Modelling of Dense Granular Flow in Cone Crushers
John Billingham, Oliver Bain, Ian Lowndes and Sam Kingman
Recirculating Inclined Chute at DAMTP, Cambridge
Alex Holyoake
Acoustic Signals of Sand Flowing Down Inclined Slope
Danielle Tan, Steve Keast, Prof. Wolfgang Sachse and Prof. Jim Jenkins
A Constitutive Relation for Dense Suspensions
Luigi La Ragione and J.T. Jenkins
Please note that the conference dinner is NOT included in the conference fee and that you will need to pay for this separately if you wish to attend.
Conference Dinner £45.00 (per person).
Conference Fees
Conference fees include lunch and refreshments on 5 - 9 January 2009 and the welcome reception.| Non IMA Member: | £410.00 |
| IMA Member: | £340.00 |
| Student: | £200.00 |
