CFD-DEM study on agglomeration and spout-assisted …
Here, the size of an agglomerate is defined as the number of original particles within this agglomerate body, represented by different colours. At a lower cohesion strength (e.g., ... Those large agglomerates can be effectively broken up by the high spouted gas velocity in a spouted bed, ...
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Oblique impact breakage unification of nonspherical particles …
There have been a few DEM studies of impact breakage for nonspherical particles. For example, a DEM study of agglomerate impact breakage was carried out considering three shapes, i.e. spherical, cuboidal and cylindral (Liu et al., 2010).It was found that internal damage of particle is closely tied to the particle deceleration adjacent to the impact site.
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Nanoparticle processing: Understanding and controlling aggregation
Commercial dry samples of NP are often aggregates (3 μm) and commercial TiO 2 particles (500 nm aggregates) could not be broken up into the primary particles (
Numerical Simulation of the Collision Breakage Process …
The breakage energy efficiency η 1 when the agglomerate is broken in the hammer crusher is, therefore, ... by DEM simulation is the percent of the number of broken bonds after breakage over the number of bonds between particles forming the agglomerate before breakage, it indicates a really-broken degree with the particle size forming the ...
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Aggregate Morphology Evolution by Sintering: Number
Besides particle transport, also energy (heat) transfer is determined by primary particle size and agglomerate/aggregate morphology (Filippov et al., 2000). The light scattering and absorption of open-structured aerosol agglomerates (D f < 2) is a function of structure and primary particle size (Sorensen, 2001). Some of the chemically most ...
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Chapter 19 Analysis of Agglomerate Breakage
In this chapter, we present the breakage characteristics of agglomerates subjected to two types of loading scenarios, namely (i) agglomerates impact against a wall and (ii) …
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Numerical modelling of breakage and adhesion of loose fine-particle …
The loose agglomerate was made of spherical elastic particles of 5 μm diameter with physical properties corresponding to lactose monohydrate.This component can be regarded as the model drug of the formulation, and fine lactose is also used as an additive in dry powders for inhalation (de Boer et al., 2012). 10 000 particles with a mean size of 5 μm were randomly …
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How do agglomerates break? | Request PDF
Granular dynamics (DEM) simulations of a polydisperse cuboidal agglomerate impacting with a target wall are reported. The paper focuses on identifying the physical …
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Mechanistic analysis and computer simulation of impact breakage …
(18) relates the number of broken contacts in the agglomerate with the primary particle properties (particle density, ρ; particle diameter, D; and particle elastic modulus, E), the interparticle interaction, the agglomerate properties (the number of particles in the agglomerate, N) and the characteristics of the test (i.e., impact velocity, V).
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Break-Up and Bounce of TiO2 Agglomerates by Impaction
In this study, the impaction behavior of titanium dioxide (TiO 2) agglomerates is evaluated, and the described method allows for the break-up and bounce of the particles to be …
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Particle Agglomeration
Nanotechnology from particle size reduction to enhancing aqueous solubility. Doaa Hasan Alshora, ... Fars Kaed Alanazi, in Surface Chemistry of Nanobiomaterials, 2016. 6.5.2.1.2 Agglomeration. Decreasing the particle size leads to an increase in the surface area and to elevation of the surface energy, which might induce particle agglomeration. The particles tend …
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Discrete element modelling of agglomerate impact using …
Typical time evolutions of the force generated at the agglomerate-wall interface, the kinetic energy of the system of primary particles composing the agglomerate and the proportion of initial interparticle bonds broken during the impact are shown in Fig. 4 (the impact velocity of the particle system is 2 m/s, the interface energy between the ...
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Analysis, modelling and simulation of the fragmentation of agglomerates
The results of each simulation are summarised in Fig. 5, showing the fraction of broken-off primary particles due to the fragmentation as a function of the dimensionless collision intensity and particle properties. ... The agglomerate-particle has a diameter of d A = 60 ...
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Particle design via spherical agglomeration: A critical …
The agglomeration rate distribution can be broken down into its agglomeration rate (r agg), a function of the meeting probability (f), the ... system is the ability to tailor both stages individually to create particles tailored to both primary particle and agglomerate particle specifications. Peña et al. [59] extended the work of ...
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A Review of the Terms Agglomerate and Aggregate with a …
The terms "agglomerate" and "aggregate" are widely used by powder technologists to describe assemblages of particles that are found in dry powders and powders in liquid suspensions. Each term has a specific meaning but, unfortunately, they are frequently interchanged at will and this has resulted in universal confusion.
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Agglomerate | Properties, Composition, …
Composition: Agglomerate rocks consist of three main components:. Clasts: These are the larger rock fragments or particles that make up the bulk of the rock.Clasts in agglomerate rocks can be made of a variety of …
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Collision and Breakup of Fractal Particle Agglomerates …
observation that the flow field induced by a particle agglomerate rotating in a shear flow has the form of two tilted vortex rings with opposite sign circulation. ... which then need to be broken up to release the small drug particles at time of use. Alternatively, ice particles can form tightly-packed aggregates in planetary rings (Schäfer et ...
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Evaluating Resonant Acoustic Mixing as a Wet Granulation …
A liquid binder is sprayed from the top, interacting with the particles in the bed volume. As particles agglomerate, they gain mass and thus are more likely to settle to the bottom of the bed, where they can be removed, providing a method to separate agglomerates once they reach a critical size. ... the doughball is broken up through further ...
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Primary Particles â Agglomerates â Aggregates
For example, five primary particles form an agglomerate by adhesion. When crystal growth begins, the agglomerate is converted into a new larger formed particle (aggregate) . Although the original geometry of the primary particles is still visible in the aggregate, the particles are firmly fused together. The surface
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Unraveling agglomeration and deagglomeration in aqueous …
The formation of fractal-like agglomerates of primary particles may already occur during the synthesis of NPs, e. g. in gas phase processes [10], [11].The primary particles are bound within the agglomerate either only by van der Waals forces ('soft' agglomerate) or are sintered together with chemical bonds through sinter necks ('hard' agglomerate) [12].
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Agglomerates of nanoparticles
Nanoparticles tend to agglomerate. The process of agglomeration is ruled by thermodynamics. Depending on the sign of the enthalpy of interaction, ensembles consist of (repelling) poorly …
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Fragmentation and bond strength of airborne diesel soot …
Although a rigorous link between the fragmentability of agglomerate particles in the airborne state and their behavior in liquid suspension (such as cellular or other body fluids) remains to be established, these findings suggest that the smallest units to which diesel particles can be broken down are probably on the order of the size of ...
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Impact breakage of particle agglomerates
Numerical simulations of polydisperse spherical agglomerates impacting orthogonally on a target wall have been performed to study the effects of impact velocity, solid …
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Design of sustained release fine particles using two-step …
The obtained cake was broken through a 150-μm sieve to produce FD coating powder (FD-Eud). Download: Download high-res image (254KB) ... Two coating powders consisting of Eud-RL nanoparticle agglomerate having different particle structures were obtained using the FD and SFD methods. To investigate coating effectiveness of these powders ...
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Solar steam generation enabled by carbon black: The impact of particle
The agglomerate and primary particle diameter, d p, specific surface area, SSA, and nanostructure vary between different CB grades and depend on the combustion conditions used for their synthesis. 15 During incomplete combustion of gaseous or liquid hydrocarbon fuels, CB nanoparticles are incepted and grow by surface reactions and coagulation ...
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Impact dynamics and power-law scaling behavior of wet …
As a wet agglomerate falls down and impacts on a rigid plane at a high speed, the capillary bond between particles may be broken when the separation distance between particles exceeds their rupture distance, the liquid is then immediately shared proportional to the particle size due to the lubrication effects of the liquid, and this liquid ...
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Study of nanoparticles aggregation/agglomeration in polymer …
Both aggregation and agglomeration are assemblies of nanoparticles where the strong and dense particle collectives are referred to aggregation. Also, agglomeration is when particles are combined loosely which can be simply broken by mechanical forces. ... and aggregate/agglomerate diameter ...
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Collision and breakup of fractal particle agglomerates in a …
The agglomerate rotates in the shear flow, but at a slower rate than the ambient fluid elements. In the computations with two colliding agglomerates, we observed cases resulting in agglomerate …
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Numerical study of agglomerate abrasion in a tumbling mixer
Bonds broke when stress applied exceeded the critical stress of the bond. In bonded particle model, a broken bond would not be formed again. All particle–particle interactions without ... Agglomerate size is defined as the number of particles in an agglomerate. The clusterization code was developed in-house and was executed in Matlab ...
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Agglomerates, smoke oxide particles, and carbon …
Jayaraman [5] and Anand [6] adopted the same set-up for agglomerate quench-collection. The ethanol bath was placed just 3 ... The third type is solid spherical particle. A broken particle is purposely shown in Fig. 6 to tell that the particle is solid inside. The content of this type in spherical agglomerates seems to be quite large compared ...
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