Juray De Wilde
Recent publications

Works in the field of reaction engineering and chemical reactor analysis and design. His research expertise includes kinetic modeling, the use of dynamic methods, the multi-scale modeling and simulation of complex single- and multiphase flows with reactions, and process intensification.
His research focuses on novel reactor concepts allowing process intensification and alternative processing routes. Detailed numerical and experimental studies in specially designed lab-scale equipment and pilot plants are combined to develop and validate models and simulation tools that facilitate reactor optimization and scale-up. Technologies and applications studied include steam methane reforming using structured catalytic reactors, chemical looping combustion and reforming, advanced surface coating using a low-temperature atmospheric-pressure plasma enhanced chemical vapor deposition reactor, and production, coating, agglomeration and drying of particles in high-G operated vortex chambers.

IMMC main research direction(s):
Fluid mechanics
Chemical engineering

reacting flows
reaction engineering
process intensification
two-phase flows

Research group(s): IMAP


PhD and Post-doc researchers under my supervision:

Vortex Chamber Spray Dryer
Thomas Tourneur

High-G operations in vortex chamber allow to intensify transfer of mass, heat and momentum. This technology can be applied for treating particles (solid powder or liquid droplets in a precursor state) with, preferably, a rotating fluidized bed in various industrial fields like coating, granulation or spray drying. In the presented work, a first pilot unit is designed with the objective to create a multi-zone environment with axial separation in order to fed air into the reactor at different temperatures to improve the process of drying. Numerical simulations are run simultaneously to validate the model used and once accepted to predict new design effect without going through the experimental study. Different designs for the vortex chamber are tested to study their effect on the vortex flow pattern.

auto-thermal Chemical Looping Reforming
Zirui He

This project aims at developing a simulation model and tool, coupling detailed reaction kinetics and a detailed gas-solid flow model. The optimization and scale-up of a-CLR process requires a fundamental understanding of the technology by rigorous modeling and simulation. As well the detailed reaction mechanism and the complex gas-solid hydrodynamics have to be accounted for.

DNS of reacting particle flows for mesoscale modeling
Baptiste Hardy

Gas-solid flows are encountered in many natural and industrial phenomena. Fluidized beds are the most well known application of gas-solid reactors in the chemical industry (catalytic cracking, biomass conversion,...).
However, the simulation of such equipments at large scale is still an issue due to the tracking of billions of particles carrying the reaction while interacting with the gas flow. Eulerian-Eulerian models are currently very popular because they describe the solid phase as a continuum, hence drastically lowering the computational cost. Though, these models require closure relations for momentum, heat and mass transfer, often obtained on empirical bases.
The goal of this research is to extract closure laws from Direct Numerical Simulations at particle scale using the Immersed Boundary Method in order to provide new mesoscale models built on physical grounds.

Multi-scale modeling of a structured catalytic reactor for steam methane reforming
Florent Minette

Methane reforming is the most widely practiced process for the production of hydrogen and syngas. The process is however strongly limited by heat transfer between the furnace and the process gas, pressure drop and intra-particle diffusion limitations. Structured catalytic reactors are promising in order to intensify the process and deal with the limitations encountered in conventional reformers.
The multi-scale modeling of ZoneFlow structured catalytic reactors is addressed. The intrinsic reaction kinetics is experimentally studied in a micro-packed bed reactor. The Langmuir-Hinshelwood-Hougen-Watson-type rate equations are derived and non-linear regression is applied to estimate the rate parameters. A pseudo-continuum approach description of the catalyst coating is used to account for intra-catalyst diffusion limitations. The complex flow pattern is described by means of a CFD model. To bridge the scales of turbulence, the RANS approach is adopted and the k-epsilon turbulence model is applied. Thermal conduction and radiative heat transfer are included. The reactor model is validated using specific experiments including cold flow pressure drop, inert heat transfer and pilot plant tests under reactive conditions.
The developed model is then used to study and optimize the performance of ZoneFlow reactors under commercial operating conditions.

Reaction kinetics and reactor design in regenerative non-oxidative coupling of methane
Edward Nicol

Validation of the performance of an innovative catalyst for methane steam reforming under near-industrial conditions
Philippe Eliaers

The role of UCL in the project is to set up and operate a pilot plant for testing an innovative structured catalyst developed for methane steam reforming (SMR). This reactor will allow achieving near-industrial conditions with the aim of comparing the performance of this new catalyst to those of a conventional SMR catalyst.

Process intensification through vortex technology
Abhishek Dutta

Process intensification is a promising pathway in the development of sustainable chemical process systems which places greater emphasis on the micro-mechanisms of intensification and experimental validation of transfer phenomena. Using vortex mechanism, the hydrodynamics is controlled for a higher mixing efficiency in which process intensification acts as a guiding principle.

Recent publications

See complete list of publications

Journal Articles

1. Hardy, Baptiste; De Wilde, Juray; Winckelmans, Grégoire. A penalization method for the simulation of weakly compressible reacting gas-particle flows with general boundary conditions. In: Computers & Fluids, Vol. 190, p. 294-307 (2019). doi:10.1016/j.compfluid.2019.06.016.

2. Minette, Florent; Lugo-Pimentel, Michael; Modroukas, Dean; Davis, Andrew W.; Gill, Rajinder; Castaldi, Marco J.; De Wilde, Juray. Intrinsic kinetics of steam methane reforming on a thin, nanostructured and adherent Ni coating. In: Applied Catalysis B: Environmental, Vol. 238, p. 184-197 (2018). doi:10.1016/j.apcatb.2018.07.015.

3. Ratan, Sanjiv; De Wilde, Juray. Structured catalyst for steam reforming. A catalyst system for steam methane reforming for improved heat transfer, pressure drop and catalyst effectiveness. In: ePTQ.COM, Vol. Q3, p. 111-113 (2018).

4. Ratan, Sanjiv; De Wilde, Juray. Gearing up for future steam reforming. In: Nitrogen + Syngas, Vol. 353, p. 44-48 (2018).

5. Parente, Alessandro; De Wilde, Juray. Bridging Scales in Modelling and Simulation of Non-Reacting and Reacting Flows. Part I. In: Advances in Chemical Engineering, Vol. 52, p. 2-192 (2018).

6. Parente, Alessandro; De Wilde, Juray. Bridging Scales in Modelling and Simulation of Non-Reacting and Reacting Flows. Part II. In: Advances in Chemical Engineering, Vol. 53, p. 2-245 (2018).

7. Weber, Justin M.; Stehle, Richard C.; Breault, Ronald W.; De Wilde, Juray. Experimental study of the application of rotating fluidized beds to particle separation. In: Powder Technology, Vol. 316, p. 123-130 (2017). doi:10.1016/j.powtec.2016.12.076.

8. Rosales Trujillo, Waldo; De Wilde, Juray. Influence of solids outlets and the gas inlet design on the generation of a gas-solids rotating fluidized bed in a vortex chamber for different types of particles. In: Chemical Engineering Science, Vol. 173, p. 74-90 (2017). doi:10.1016/j.ces.2017.07.031.

9. Verma, Vikrant; Li, Tingwen; De Wilde, Juray. Coarse-grained discrete particle simulations of particle segregation in rotating fluidized beds in vortex chambers. In: Powder Technology, Vol. 318, p. 282-292 (2017). doi:10.1016/j.powtec.2017.05.037.

10. De Wilde, Juray; Lorant, Christophe; Descamps, Pierre. 2D modeling and simulation of the flow dynamics, electric field and reactions in a low-temperature, atmospheric-pressure nitrogen plasma sharp-end plate-to-plane configuration and CVD reactor. In: Journal of Physics D: Applied Physics, Vol. 50, no.13, p. 135202 (2017). doi:10.1088/1361-6463/aa5c1d.


1. De Broqueville, Axel; De Wilde, Juray; Tourneur, Thomas. Device for treating particles in a rotating fluidized bed.

Conference Papers

1. Hardy, Baptiste; De Wilde, Juray; Winckelmans, Grégoire. A penalization method for DNS of weakly compressible reacting gas- solid flows.

2. He, Zirui; Minette, Florent; De Wilde, Juray. Numerical simulation of industrial scale autothermal Chemical Looping Methane Reforming for syngas production in a dual fluidised bed reactor.

3. Minette, Florent; De Wilde, Juray. Multi-scale modeling of an annular structured catalytic reactor: application to steam methane reforming.

4. Minette, Florent; De Wilde, Juray; Marco Castaldi; Michael Lugo. Experimental study of the intrinsic kinetics of steam methane reforming on a thin and adherent Ni coating.

5. Minette, Florent; De Wilde, Juray. Multi-scale modeling of an annular structured catalytic reactor for steam methane reforming.

6. Hardy, Baptiste; Winckelmans, Grégoire; De Wilde, Juray. A penalization method for the Direct Numerical Simulation of low-Mach reacting gas-solid flows.

7. Lugo, Michael; Tiliakos, Nickolas; De Wilde, Juray; Gill, Rajinder; W. Davis, Andrew; Soltani, Elaine C.; Modroukas, Dean; Castaldi, Marco J. Enhanced hydrogen production from methane steam reforming using a new thin layered structural coating on a metal substrate.

8. De Wilde, Juray; Eliaers, Philippe. Measurements and Flow Visualization Techniques for Multiphase Systems. Low-Temperature, Wet Coating of Cohesive Particles in a Vortex Chamber Generated High-G Fluidized Bed.

9. Benyahia, Sofiane; De Wilde, Juray; Torres , Jessica. Understanding Particulate Flow Physics by Means of Large Simulation Data Sets.

10. Lorant, Christophe; Descamps, Pierre; De Wilde, Juray. Simulation of low-temperature, atmospheric-pressure plasma enhanced chemical vapor deposition reactors.

Book Chapters

1. Rosales Trujillo, Waldo; De Wilde, Juray. High-Gravity Operation in Vortex Chambers for the Generation of High-Efficiency Fluidized Beds. In: Alternative Energy Sources for Green Chemistry (Green Chemistry Series; xxx), Georgios Stefanidis, Andrzej Stankiewicz, 2016, p. 360-404. 978-1-78262-140-9. doi:10.1039/9781782623632.

2. De Wilde, Juray. Rotating Fluidized Bed Reactors. In: Novel Reactor Concepts , Van Sint Annaland M, Gallucci F., Metcalfe I.: Imperial Colege Press, UK, 2013.

3. De Wilde, Juray. Gas-Solid Heat and Mass Transfer Intensification in Rotating Fluidized Beds in a Static Geometry. In: Heat Transfer. Theoretical analysis, Experimental investigations and Industrial Systems , Intech: Rijeka, Croatia, 2011, p. 593-634. 978-953-307-226-5.

Working Papers

1. De Wilde, Juray. The Filtered Description of Gas-Solid Momentum Transfer: from a Drag Type Description to an Apparent Distribution of the Filtered Gas Phase Pressure Gradient over the Phases (xxx), 2007.


1. Froment, Gilbert F.; Bischoff, Kenneth B.; De Wilde, Juray. Chemical Reactor - Analysis and Design. John Wiley & Sons, 2011. 978-0-470-56541-4. 867 (book); 247 (solution manual); 4 simulation codes pages.


1. Benyahia, Sofiane; De Wilde, Juray. Centrifugal Force Improves Chemical Looping Reactor Performance, 2015.