Plenary Speakers

Kevin Galvin

Kevin Galvin

ARC Centre of Excellence for Enabling Eco-Efficient Beneficiation of Minerals, University of Newcastle, Callaghan, NSW Australia

Title of the talk:

Geometry Matters – How Inclination Shifts the Drift Flux and the Process

Kevin Galvin is the inventor of the RefluxTM Classifier, a novel fluidized bed used in gravity separation of fine particles. With over 240 installations around the world, the technology has been used to beneficiate iron ore, mineral sands, potash, chromite, spodumene, manganese and other base metal oxides. New innovative systems incorporating gas bubbles are emerging including the Reflux Flotation Cell and CoarseAIR through collaboration with FLSmidth. Kevin Galvin obtained his PhD from Imperial College and is a Laureate Professor at the University of Newcastle, Australia. He is a Fellow of the Australian Academy of Science and Australian Academy of Technology and Engineering and previous recipient of numerous awards including the Antoine Gaudin Award in mineral processing. He is Director of the ARC Centre of Excellence for Enabling Eco-Efficient Beneficiation of Minerals.

Newcastle, Callaghan, NSW Australia When the vertical free-board elutriation zone of a fluidized bed is replaced by a system of parallel inclined channels, a powerful feed-back ensues thereby producing a shift in the drift flux and process intensification. The particle/bubble transport through the system of inclined channels brings new complexity to the fluidized bed system, featuring enhanced segregation, shear induced inertial lift, and the decoupling of previous process constraints. This presentation explores the effects of this simple change to the physical geometry, covering several arrangements and applications, including the Reflux Flotation Cell. The so-called Valley of Death which stands between the laboratory and achieving real world industrial impact is also explored.
Michael Schlüter

Michael Schlüter

Institute of Multiphase Flows, Hamburg University of Technology, Hamburg, Germany

Title of the talk:

The Journey of Reacting Species through Multiphase Reactors: From Eulerian to Lagrangian View

Michael Schlüter studied Process Engineering at the University of Bremen and received is PhD at the Institute of Environmental Process Engineering. After his habilitation in the field of multiscale transport phenomena in multiphase flows he changed to the Hamburg University of Technology where he owns the chair of „Fluid Mechanics for Multiphase Systems“ and is head of the Institute of Multiphase Flows. He serves as coordinator of the DFG Priority Program „Reactive Bubble Columns“ and is chair of the Working Party „Multiphase Fluid Flow“ in the European Federation of Chemical Engineering. Since May 2023 he is Spokesperson of the DFG Collaborative Research Center 1615 “SMART Reactors”. His research interest is primarily in the field of multiscale transport phenomena in chemical and bioprocess engineering, reactor development, design and scaleup.

For the design and operation of multiphase reactors, temporally and spatially averaged data from an Eulerian perspective are generally used, such as dispersion coefficients, residence time distributions or energy dissipation rates. With this assumption of a homogeneous mixed system, inhomogeneities, as they usually occur in multiphase reactors, are not captured. Nevertheless, these inhomogeneities are important from the point of view of a reacting species, such as a catalytic particle or a cell, as they are ex-posed to changing conditions in such inhomogeneities on their trajectory through the reactor, such as changing temperatures, concentrations, or shear stresses. New experimental methods with 4D Particle Tracking Velocimetry or Lagrangian Sensor Particles as well as new analytical methods with Lagrangian Coherent Structure Analysis or Mean Age Theory open up new possibilities to track reactive species in multiphase reactors on their individual paths. This Lagrangian perspective allows deep insights into reactor performance and the possibilities and limits of scaling up. In the lecture, the new possibilities will be presented, compared and discussed with regard to their use in chemical, biochemical and pharmaceutical applications.

Vivek Ranade

Vivek Ranade

Bernal Chair Professor of Process Engineering at Bernal Institute
University of Limerick, Ireland

Title of the talk:

Hydrodynamic cavitation for intensifying multiphase processes:
State of the art, challenges, and path forward

Vivek Ranade is a Bernal Chair Professor of Process Engineering at Bernal Institute, University of Limerick, Ireland. He leads ‘Multiphase Reactors and Process Intensification’ group. Vivek and his group use experiments, computational flow modelling, population balance models and machine learning to generate new insights in multiphase flows, multiphase reactors, and process intensification. The group is developing novel fluidic devices, intensified processes and ‘factory in a box’ platforms for decentralised manufacturing, personalised products, responsible resource usage, decarbonisation as well as mitigation and valorisation of waste. https://bernalinstitute.com/our_people/vivek-ranade/; https://scholar.google.co.uk/citations?user=zJqVCsUAAAAJ&hl=en

Multiphase processes are used in a wide range of applications and are of great economic and ecological importance. Hydrodynamic cavitation is a phenomenon of formation, growth and collapse of vapour filled cavities that generates highly localised extreme conditions (temperatures > 103 K, pressures > 102 MPa, energy dissipation rates > 107 m2/s3, and highly oxidising radicals). Harnessing such localised extreme conditions hold tremendous promise for intensifying a wide range of multiphase processes and thereby enhancing resource efficiency and facilitating decarbonisation throughout the value chain and across the economy. In recent years, hydrodynamic cavitation has been used for intensifying wastewater treatment, ozonation, microbial disinfection, descaling, desulphurisation of fuels, biomass pre-treatment, biodiesel synthesis, food and beverage production, multiphase reactions, crystallisation, and many other applications. Despite the intense research and several start-up companies, the full potential of hydrodynamic cavitation is not yet realised. One of the key reasons for this is inadequate understanding of inception as well as resulting physico-chemical effects of cavitation. Systematic methodology for designing hydrodynamic cavitation devices and generalised framework for development, scale-up and optimisation of hydrodynamic cavitation processes is still not adequately established. In this talk, I will critically review the state of the art on applications of hydrodynamic cavitation including types and performance of different cavitation devices. In addition, the current state of fundamental understanding of complex physico-chemical processes occurring in hydrodynamic cavitation will be reviewed. This will include the inception of cavitation, collapsing cavities, media properties like viscosity, dissolved gases, presence of dispersed phase particles, operating parameters (temperature, pH, concentrations) as well as device design and scale. Various prevailing approaches for modelling of hydrodynamic cavitation including empirical, phenomenological, and multi-scale models will be discussed in light of personal experience of their application. Key challenges and potential ways of overcoming these challenges will be highlighted. At the end, some thoughts on the path forward and prospects will be shared. I believe that hydrodynamic cavitation has a great potential to beneficially impact resource efficiency, new products, and decarbonisation across many sectors. I hope that the talk will stimulate further research on hydrodynamic cavitation and facilitate wider applications of hydrodynamic cavitation to realise its true potential.

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Important dates

30th November 2023
Abstract deadline

28 February 2024
Notification of
abstract acceptance

March 2024
Registration opens

31st March 2024
Deadline Awards Nominations

30th April 2024
Registration Deadline for
Presenting Authors

30th April 2024
Special Issue full
manuscript due date

01st May 2024
Notification of GLS-16 Awardees

31st May 2024
Early Registration Deadline

2nd – 5th September 2024
Conference