A5101601205- Fluid Dynamics and Turbulent Flows
- Navier-Stokes equation solutions
- Solar and Space Plasma Dynamics
- Particle Dynamics in Fluid Flows
- Cyclone Separators and Fluid Dynamics
- Granular flow and fluidized beds
- Advanced Thermodynamics and Statistical Mechanics
- Fluid Dynamics and Mixing
- Catalytic Processes in Materials Science
- Catalysis and Oxidation Reactions
- Mineral Processing and Grinding
- Chemical Looping and Thermochemical Processes
- Thermochemical Biomass Conversion Processes
- Iron and Steelmaking Processes
- Optical Polarization and Ellipsometry
- Nanofluid Flow and Heat Transfer
- Electrohydrodynamics and Fluid Dynamics
- Graphite, nuclear technology, radiation studies
- Environmental and Industrial Safety
- Carbon Dioxide Capture Technologies
- Heat and Mass Transfer in Porous Media
- Material Properties and Failure Mechanisms
- Industrial Gas Emission Control
- Astro and Planetary Science
- Heat transfer and supercritical fluids
Ghent University
2019-2022
Universidad de Valladolid
1999-2018
Abstract The gas–liquid vortex reactor (GLVR) has substantial process intensification potential for multiphase processes. Essential in this respect is the micromixing efficiency, which of great importance fast reaction systems such as crystallization, polymerization, and synthesis nanomaterials. By creating a flow taking advantage centrifugal force field, liquid can be intensified GLVR. Results show that introducing into gas‐only unit results suppression primary secondary gas flow....
Heat management problems often prevail in reactors when highly exothermic chemical reactions occur. In these situations, fluidised bed are preferred due to their excellent heat transfer capabilities. However, the design, scale-up and operation of is still challenging complex hydrodynamics. To gain a better understanding on transport reactors, degree temperature non-uniformity for several fluidisation regimes pseudo-2D was quantified using Infra-Red Thermography. The Probability Density...
The high gas–solid slip velocity and the resulting intensified heat mass transfer make vortex reactors (GSVR) a promising reactor technology for oxidative coupling of methane (OCM). short gas residence time solid in GSVR require highly active catalyst with strong attrition resistance. Conventional Sr/La2O3 catalysts possess sufficient activity; however, these materials lack mechanical strength. In this study, novel mechanically is developed by supporting conventional OCM on porous SiC...
Abstract To develop cost‐effective CO 2 capture technology process intensification will play a vital role. In this work, the capabilities of gas–liquid vortex reactor (GLVR) as novel equipment are evaluated by studying its interphase mass transfer parameters to build up fundamentals for future application example, capture. The NaOH‐CO chemisorption system and Danckwerts' model applied obtain effective interfacial area liquid‐side coefficient. Results show that contact in GLVR is capable both...
Abstract Vortex units are commonly considered for various single and multiphase applications due to their process intensification capabilities. The transition from gas‐only flow gas–solid remains largely unexplored nonetheless. During this transition, primary phenomenon, jets, secondary phenomena, counterflow backflow, substantially reduced, before a rotating solids bed is established. This transitional regime referred as the vortex suppression regime. In present work, identified validated...
Liquid injection in fluidized beds occurs well-established industrial processes as fluid coking, spray fluidzed bed granulation and condensed mode gas-phase polymerisation. These still suffer performance issues due to their complex nature, where liquid adds even more complexity. In this work, the effect of on temperature uniformity a pseudo-2D was studied using Infra-Red Thermography. The images were also qualify agglomeration behaviour. Injecting smaller droplets (∼90 μm affects than...
It is generally assumed that the study of spectrum linearized Navier-Stokes equations around a static state will provide information about stability equilibrium. This obvious for inviscid barotropic compressible fluids by self-adjoint character relevant operator, and rather easy viscous incompressible compact resolvent. The system, both periodic homogeneous Dirichlet boundary problems, satisfies neither condition, but it does turn out to be generator an immediately continuous, almost stable...
The boundary layer created by parallel flow in a magnetized fluid of high conductivity is considered this paper. Under appropriate conditions, self-similar solutions analogous to the ones studied Blasius for hydrodynamic problem may be found. It proved that these stable, size Alfven velocity at outer must smaller than velocity, fact has ready physical explanation. process which transverse and thickness grow with detailed.
Electron magnetohydrodynamics (EMHD) models the flow of electrons in fast time scalesin an inhomogeneous plasma, by considering ions as stationary. A number numerical studieshas shown interesting phenomenology, but so far no proof exists existence solutionsfor main equation. This equation is similar to vorticity inviscidflows, techniques used prove local that case do not work wellin a bounded domain. However,the formulation Cauchy solution for certain transport equationsplus estimates on...
Reflection and refraction of magnetosonic waves in domains different sound Alfvén speeds have been often studied by means the linearized magnetohydrodynamic equations, obtaining a more complex version Fresnel laws. However, these are intrinsically nonlinear this method does not describe adequately wave interaction. We consider high-frequency geometric optics approximation to follow evolution until interface is reached, where procedure fails because variation spatial scales faster than...
It is commonly assumed that the alpha effect of mean-field magnetohydrodynamics essentially stops acting wherever size reaches a certain value. We show if mean velocity approximately constant, regions where field such threshold tend to shrink in or tends become constant there. The rate this process also estimated.
We present a simplified form of the magnetohydrodynamic system which describes evolution plasma where small-scale velocity and magnetic field are aligned in Alfvén waves, such as happens several turbulent situations. Bounds on dimension global attractor found, shown to be an improvement standard ones for full equations.
The equations of mean field magnetohydrodynamics with constantmean velocity are proved to posses solutions bounded in the$H^{1}$-norm for all time, and a compact attractor whose dimensionis estimated. It is shown that depending on the functional form ofthe so-called alpha term may reduce zero or be alarger set. If, as usual physical situations, there exists aset minimum size $N$, dimension thisset decreases rapidly increasing $N$. Finally, dependenceof magnetic diffusivity...
The kinetic energy of a fluid located between two plates at different temperatures is easily bounded by classical inequalities. However, experiments and numerical simulations indicate that when the convection turbulent, volume domains in which speed large, rather small. This could imply maximum speed, contrast with its quadratic mean, does not admit an priori upper bound. It proved that, provided pressure remains bounded, uniform estimate for indeed exist, it depends on maxima certain ratios...
A study of the distribution energy among different scales is performed for several systems in fluid mechanics, including Navier–Stokes, magnetohydrodynamics and active scalars equations. It found that all these possess a common structure which enables us to deduce how introduced by forcing transferred present flow. also shown special cases an cascade will occur. The limits this method are considered.