Single‐particle Motion And Heat Transfer In Fluidized Beds

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Predicting Product Properties of Fluidized Bed Spray

fluidized beds • Evaporation of surface liquid, droplet motion and deposition can be tracked for every particle • Track fate of single particle • Track properties of droplets and impact parameters • Goal: Predict particle structure from simulations directly Microprocesses in Layering Spray Granulation

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major problems with jet phenomena in fluidized beds is the possibility of wear on bed walis and internals by the sand-blasting effect caused by high-speed transport of particles. Accurate prediction of jet penetration length is consequently of great importance. Gas discharge from an orifice into a fluidized bed is commonly studied visually through

Particle Scale Simulation of Heat Transfer in Fluid Bed

and inserts in a fluidized bed (Di Maio et al , 2009; Zhao et al., 2009). But in those studies, the heat transfer mode by particle-particle conduction is only partially considered. The analysis of heat transfer mechanisms has not been performed seriously. More recently, Zhou et al. (2009; 2010a) proposed a comprehensive model taking into

A SINGLE PARTICLE VIEW OF FLUIDIZATION

simulating fluidized beds, such as discrete element methods. INTRODUCTION Both fundamental understanding and practical design of fluidized beds requires the solids motion to be understood, preferably on a single particle level. While many single particle tracking methods have been used, radioactive tracers have distinct advantages in opaque systems.

University of Groningen Particle Transport in Fluidized

fluidized beds and transport lines could be operated stably for a satisfactory catalytic cracking process (Kunii and Levenspiel, 1991). Esso engineers concentrated on this idea and built a large-scale pilot plant of an up-flow cracking unit (Geldart, 1986). The Fluid Catalytic Cracking (FCC) process was then on track.

PTirtacelmtiascaltearfppormlicaat tduionrch Klicken

motion. Wheel mass is m=10 kg, moments of inertia are Ixx=1.0, contact heat transfer Convective fluid-particle heat transfer Simulation ist mehr als Software 70. Single particle Fixed or fluidized beds Simulation ist mehr als Software. ROCKY and ANSYS: Fluent Coupling:

Graduate Students Associated with the - U of T

Heat Transfer Modeling of Cooling Meat Products CFD Modeling of Slurry Jet Erosion (co-supervisor M. Papini, Ryerson Univ.) High Strain-rate Fracture Prediction of Microelectronic Solder Joints Surrounded by Adhesive Underfill 2014 M.A.Sc. N. Tamannaee Slurry-jet and Water-jet Machining of Plastics (co-supervisor M. Papini, Ryerson Univ.)

EVALUATION OF A SUB-GRID MODEL IN A TURBULENT …

scale structures in a circulating gas-solid fluidized bedand compare to a well characterized fluidized bed experiment performed by van den Moortel et al. (1998). In what follows, we discuss some background on the averaged equations for two-phase gas-solid flows and present the sub-grid model used and the results compared with experiment. 2.

Numerical and experimental study of a novel compact micro

32 resistance and superior mass and heat transfer characteristics. Fluidized beds are likely to be 33 superior to the fixed and moving beds [11]. 34 Fluidized beds have been applied widely in a variety of industrial processes at 35 conventional scales ranging from …

Three-Dimensional Turbulent Particle Dispersion Submodel

and coal slurry combustion, fluidized beds, sorbent injection, and hazardous waste incineration. The interactions of the condensed phases with turbulent environments in such applications have not been well described. Such a description is complicated by the difficulty of describing turbulence in general, even in the absence of particles or

OXFORD LONDON • NEW YORK • PARIS

heat transfer rate per unit volume from particles to fluid peculiar velocity components of single particle peculiar temperature of single particle, also: angle measured from initial Mach line particle distribution function fluidized beds and other two-phase flow phenomena of interest in chemical process

AFFILIATED INSTITUTIONS ANNA UNIVERSITY, CHENNAI

Mass and heat transfer coefficients in packed beds, Equation of motion for a single particle, calculation of drag, motion of a particle in two-dimensions, The Fluidized state, Nature of hydrodynamic suspension, particle forces, species of Fluidization,

Thermal Radiation in Packed and Fluidized Beds

22, 1988. Keywords: Packed and Fluidized Beds, Radiation, Radiation Interactions. reviewed by Saxena et al. (1978). Glicksman and Decker (1982) examined the role of radiation and particle packing on the heat transfer from immersed surfaces to particles in fluidized beds. Combined wall-to-fluidized bed heat transfer was studied by Flamant and Menigault (1987). Brewster and

Detailed One-Dimensional Model for Steam-Biomass

Detailed One-Dimensional Model for Steam-Biomass Gasification in a Bubbling Fluidized Bed Cornelius E. Agu,*,† Christoph Pfeifer,‡ Marianne Eikeland,† Lars-Andre Tokheim,† and Britt M.E. Moldestad† †Department of Process, Energy and Environmental Technology, University of South-Eastern Norway, 3918 Porsgrunn, Norway ‡Department of Material Sciences and Process Engineering

Fundamental Particle Fluidization Mechanism and Handling

Figure 2 illustrates the powder flow mechanism in the rotating fluidized bed. In a conventional fluidized bed, air distributor is horizontally mounted and powder samples are introduced onto the air distributor. Powders are lifted up by a vertical airflow (drag force and buoyancy against the gravity force). In a rotating fluidized

Fluidization of elongated particles - effect of multi

Fluidized beds are irreplaceable equipment in industry as they offer the highest contact between solid particles and gas, together with rapid mixing of particles and most efficient heat transfer between gas and solids. Due to their industrial importance, fluidized beds have been subject of numerous experimental and numerical research over

Hydrodynamic Behavior of Particles in a Jet Flow of a Gas

Fluidized beds with jets have found applications in many industrial processes to involving drying, gran-ulation, coating, and strong endothermic/exothermic reactions such as gasification and combustion of coal. The use of a jet can increase the overall solids circulation and hence enhance heat and mass transfer. How ever the

Doctoral Theses Supervision

• Verma A. K., “Studies on the mechanism of wall to bed mass transfer in liquid fludized bed: A single particle approach,”(1984). • Rama O. P., “An experimental technique for the study of enhanced heat transfer due to motion of a particle,” “Role of single particle in heat transfer in fluidized beds,”(1970). 2.

Introduction to Particle Technology – Second Edition

7.5 Expansion of a Fluidized Bed 178 7.5.1 Non-bubbling Fluidization 178 7.5.2 Bubbling Fluidization 180 7.6 Entrainment 182 7.7 Heat Transfer in Fluidized Beds 186 7.7.1 Gas–Particle Heat Transfer 186 7.7.2 Bed–Surface Heat Transfer 188 CONTENTS vii

PARTICLE MIXING IN GAS-SOLID BUBBLING BED

Mixing of particles is an important factor in fluidized bed combustors. The horizontal mixing of fuel particles affects the performance of the beds. The mixing has a great influence on the distribution of heat release from the fuel. In a bubbling fluidized bed the particle movement is caused by rising bubbles.

EXPERIMENTAL AND COMPUTATIONAL STUDY OF THE BED …

fluidized bed is the motion of two phases where the interface is unknown and transient, numbers. However, when a single particle moves in a dispersed two-phase mixture, the The kinetic theory model clearly explains why fluidized beds are such good heat transfer devices. Their thermal conductivity,

Publications (Journals and Conferences)

transfer between two coaxially rotating disks” Numerical Heat Transfer (Part-A), 39, 285-305, “Effect on heat transfer due to a particle in motion through thermal boundary layer over a flat plate,” I & EC “Fluid convective transfer in fluidized beds-A model based on single …

PARTICLES, BUBBLES & DROPS - GBV

3.1.1 Heat-mass transfer analogy 65 3.1.2 Mass, momentum and heat transfer - Transport coefficients 66 3.2 Steady motion and heat/mass transfer at creeping flow 69 3.3 Transient, creeping flow motion 74 3.3.1 Notes on the history term 76 3.3.2 Hydrodynamic force on a viscous sphere 80 3.3.3 Equation of motion with interfacial slip 81

Packed Bed Combustion: An Overview - Engineering

- bed not fluidized, particles remain at rest. Packed Bed Combustion - University of Ottawa heat transfer to/from surface particle motion gas flow heat conduction in solid species diffusion and heat Two-dimensional beds - tranverse gas mixing, heat transfer - particle motion and mixing on inclined grate Research Frontiers.

Modeling Of Rice Husks Gasification In A Fluidized Bed Reactor

Figure 1: Fluidized bed gasifier reactor Table 1: Major specifications for fluidized bed rice husks gasifier Object Parameter Unit Reactor Height (m) 5.0 Diameter (m) 0.3 Wall material thickness (mm) Rice husks Mass flow rate (kg/hr) 40 Feed material density (kg/m3) 389 Porosity 0.64 Particle size ( m) 856

Particle-scale modeling of heat transfer in a double screw

USDA REE Energy Summit. 2. Fast pyrolysis reactors. Fluidized bed reactors are commonly used. • High heat transfer rate • Relatively mature design experience • Simple geometry • Capability for scale-up • Ease of operation • High bio-oil yield. Drawback: Large amount of hot inertial fluidized gas is …

Heat Transfer and Hydrodynamics in Stirred Tanks with

12/5/2021  Abstract: The heat transfer and hydrodynamics of particle flows in stirred tanks are investigated numerically in this paper by using a coupled CFD–DEM method combined with a standard k-e turbulence model. Particle–fluid and particle–particle interactions, and heat transfer processes are considered in this model.

NUMERICAL SIMULATION OF GAS-SOLID FLOW IN AN

for the fluid-solid and solid-solid momentum transfer and both for fluid and solid phase stress tensors. In general in a gas-solid system, the mechanisms and formulation of interaction forces have been investigated, starting from studies on the dynamics of a single particle, by many au-thors[7-10].

Chemical Engineering Science - Pharma Excipients

tion motion on the particles, the drying capacities of the gases in different regions can be adjusted to control the overall coating per-formance (Peglow et al., 2011; Bück et al., 2016). The uniformity of the coating layer among particles (inter-particle) and on a single particle (intra-particle), the integrity, and

CFD-DEM Simulation of a Coating Process in a Fluidized Bed

2/9/2020  Fluidized Bed Rotor Granulator Philipp Grohn 1,*, Marius Lawall 1, The equations describing the heat, mass, and momentum transfer in the gas phase can be written as a general equation: @ [26], the motion of each single particle is calculated using motion equations for translation and rotation, according to Newton and Euler

THREE PHASE EULERIAN-GRANULAR MODEL APPLIED ON …

heat transfer is characteristic for fluidized bed (FB). Two approaches are frequently used for CFD modeling of gas–solid fluidized beds: the Euler-Lagrange (EL) approach and the Euler-Euler treated as discrete particles, and described by Newton's laws of motion on a single particle scale (discrete particle modeling - DPM) [3-5].

Particle Tracking in Fluidized Beds with Secondary Gas

tracking (PEPT) is used to investigate the solids distribution as well as the motion of a single particle in a fluidized bed with secondary gas injection. This non-invasive technique is based on labeling one single particle, randomly selected from the bulk, radioactively, which allows tracking its motion with high temporal and spatial resolution.

Simulations of solid-liquid suspensions from dilute to dense

•heat and mass transfer Micro-scale physics •primary nucleation •growth •agglomeration •attrition (secondary nucleation) (G)LS example: industrial crystallization 1100 L draft tube, baffled crystallizer feed fines removal fines inlet boiling zone product collisions (particle-particle and particle -impeller) particle-turbulence interaction

RÉSUMÉ MIRYAN CELESTE CASSANELLO FERNANDEZ

Biotechnol., Chem. Eng Proc, Chem Eng Science, Env Science and Technol, I&EC Research, Int. Comm Heat & Mass Transfer, LAAR, J. of Solid Dynamics from Experimental Trajectory Time-Series of a Single Particle Motion in Gas-Spouted Beds, M.C Flow structure of the Solids in a Three-Dimensional Gas-Liquid-Solid Fluidized Bed, F

Introduction to Particle Technology

5.7 Heat Transfer in Fluidized Beds 115 5.7.1 Gas-Particle Heat Transfer 115 5.7.2 Bed-Surface Heat Transfer 116 5.8 Application of Fluidized Beds 119 5.8.1 Physical Processes 119 5.8.2 Chemical Processes 120 5.9 A Simple Model for the Bubbling Fluidized Bed Reactor 122 5.10 Some Practical Considerations 127 5.10.1 Gas Distributor 127

Control of the Reaction Zone in Bubbling Fluidized Beds by

particles. In order to investigate the motion of single particles, a particle is selected from the bulk and labeled radioactively. Thus, by means of PEPT the location of the labeled particle within the fluidized bed can be tracked in real-time (9, 10 ). In the following the residence time …

Introduction to Particle

7.5 Expansion of a Fluidized Bed 178 7.5.1 Non-bubbling Fluidization 178 7.5.2 Bubbling Fluidization 180 7.6 Entrainment 182 7.7 Heat Transfer in Fluidized Beds 186 7.7.1 Gas–Particle Heat Transfer 186 7.7.2 Bed–Surface Heat Transfer 188 CONTENTS vii

3D Eulerian simulation of a gas-solid bubbling fluidized

Fluidized beds have been widely used in power generation and in the chemical, biochemical, and petroleum industries. The 3D simulation of commercial scale fluidized beds has been computationally impractical due to the required memory and processor speeds. …

EFFECT OF OPERATING PRESSURE ON PARTICLE …

The effect of elevated pressure on gas-solid heat transfer in an olefin polymerization fluidized bed was numerically analysed by using an in-house developed 3-D computational fluid dynamics code coupled with a discrete element model p(CFD-DEM). To mimic the heat production due to the polymerization reaction, a constant

DOE Workshop on Roadmap for Multiphase flow, University of

¾Development of averaged equations of motion and -impact on heat transfer Two-fluid models-effects of fluid inertia at particle scale-boundary -e.g., in vibrated & fluidized beds-segregation - segregation models (density, size, shape) - effect of cohesion - role of interstitial fluid - mixing and segregation Contact force models

Granular Simulations in LAMMPS

Fluid Mechanics and Heat Transfer of the JKU. Our research focus covers: (a) solids charging, (b) offgas scrubbing, (c) industrial dust recycling, (d) sedimentation & erosion and (e) trickling beds Current Industrial partners: Siemens VAI Metals Technologies, voestalpine Stahl, voestalpine Donawitz, Polysius (ThyssenKrupp group)

NY - UNT Digital Library

where p and pp are, respectively, the densities of the gas and the material of the particles, E is the voidage, p is the gas pressure, ui and vi are the velocities of the gas and solids, respectively, 24 is the gas stress tensor and T is the particle relaxation time.For the solid phase, where Sij is the solid phase stress tensor and g is the gravitational acceleration.

Role of Hydrodynamics on Chemical Reactor Performance

‣ Then follow a textbook analysis of transport and reaction in a single particle where one uses these effective transfer coefficients ‣ The cluster-corrected external transfer coefficients can be smaller than those one would get in equivalent homogeneous systems by several orders of magnitude1,2 1) Dong, et al., Chem. Eng. Sci., 2008, 63

Rapid Heating of Gas/Small-Particle Mixture

The study of heat transfer for a mixture of par­ ticles and gas has been of interest in areas such as airborne aerosol in pollution problems, particle forma­ tion in clouds, fluidized beds in. combustion chambers, etc. Hunt (1978) proposed the concept of using small

Effective diameter for group motion of polydisperse

performance. In particular, fluidized coal beds typically involve a complex polydisperse mixture of solids with gases for which the relative velocity determines such aspects as bed expansion, fluidization velocity, and various mass and heat transfer properties. In addition, several other environ-mental and energy-related systems including

Modeling the Gas-solid Flow in the Reduction Shaft of COREX

sible change of a given system due to heat transfer and chemical reactions. The sticking force is here assumed in the range of 0–25 mg. This is based on the previous finding that agglomeration becomes significant when the sticking force between particles is over 15 mg in fluidized beds30) and the knowledge that the sticking forces for the

“Essentially, all models are wrong, but some are useful” G

boilers, heat exchangers, internal combustion engines, liquid propellant rockets, fire sprinkler suppression systems. • Liquid–liquid flows: • Industrial: emulsifiers, fuel-cell systems, micro-channel applications, extraction systems. • Gas–liquid–solid flows: • Industrial: air lift pumps, fluidized beds, oil transportation

Simulations of scalar dispersion in fluidized solidliquid

esses carried out in liquid-fluidized beds in many cases rely on scalar (heat, species) transfer brought about and enhanced by the relative, erratic motion of solid and liquid.3–6 In solid–liquid scalar transfer, roughly two stages can be identi-fied. (1) Release of the scalar in the liquid through diffusion at the solid–liquid interface.