A settling tube to determine the terminal velocity and size distribution of fluidized nanoparticle agglomerates

Martín, Lilian de; Sánchez-Prieto, J.; Hernández-Jiménez, F.; Ommen, J. Ruud van

doi:10.1007/s11051-013-2183-3

Cited by 15 publications

(19 citation statements)

References 24 publications

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“…The size distribution of the fluidized agglomerates was experimentally determined from the images taken by the settling tube technique [29]. For all the powders, the agglomerate size varies between 76 µm and 462 µm, which is in good agreement with values found in literature using a high speed camera [10,11,13,21,22].…”

Section: Size Distributionsupporting

confidence: 82%

“…The settling tube is a black box with an opening at the top to catch falling agglomerates, and two openings on the side for agglomerate recording and tube cleaning purposes (Fig.1). A rigid borescope (Olympus R040-021-000-60 S5) and high speed camera (Phantom v9.1) system are used for the recordings, enabling a visible size range from 30 µm to 4 mm [29].…”

Section: Methodsmentioning

confidence: 99%

“…The movies are analyzed using a MATLAB script by dividing them into frames, and later processing each frame for light correction, and agglomerate recognition, tracking, filtering, and measurements. More details on the technique can be found in the papers by de Martin et al [29,30].…”

Section: Methodsmentioning

confidence: 99%

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Modeling the size distribution in a fluidized bed of nanopowder

Fabre

Clemente

Balas

et al. 2017

Environ. Sci.: Nano

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Section: Size Distributionsupporting

confidence: 82%

Section: Methodsmentioning

confidence: 99%

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Modeling the size distribution in a fluidized bed of nanopowder

Fabre

Clemente

Balas

et al. 2017

Environ. Sci.: Nano

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“…They analyzed the shape and formation mechanism of agglomerates to reveal that most of the agglomerates have a branching structure with a well-defined center. De Martin et al proposed an in situ technique to determine continuously and accurately the agglomerate size of TiO 2 nanoparticles [6]. They found that the agglomerate size distribution is similar to the one for other nanoparticles whose averaged agglomerate diameter is 100 to 200 μm [5,[7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Gas‐Solid Behavior in Fluidized Beds with Superfine Particles

et al. 2017

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Fluidized beds are commercially utilized in gas‐solid contacting processes such as the fluid catalytic cracking (FCC) process. Attempts have been made for bubbling fluidized beds to enhance the gas exchange between the bubble phase and the emulsion phase as well as to increase bubble holdup. Low‐density superfine particles 5070S were selected with average diameters of about 10 μm. Unlike agglomerate particulate fluidization of superfine particles on which other researchers have reported, the smaller bubbles, whose diameter is less than 10 mm, uniformly dispersed in the whole bed. Additionally, the gas exchange rate with 5070S became larger than with the FCC particles. Such a unique gas‐solid behavior is probably due to the proper density difference between particle aggregate and fluidizing gas.

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“…Since agglomerates of nanoparticles which are formed during fluidization are very light and fragile in nature, agglomerate sampling techniques have recently received attention from researchers . However, there are some studies in which particle samples were physically removed from the bed and then were prepared for microphotograph examination.…”

Section: Methodsmentioning

confidence: 99%

Size of nanoparticle agglomerates in fluidization

et al. 2016

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A model based on force balance was proposed to estimate the equilibrium size of agglomerates formed in the fluidization process of nanoparticles. This model was derived based on the balance between drag, collision, and gravity forces as separation forces, and the van der Waals force as an adhesion force. The effects of permeability of agglomerates and addition of isopropanol to the gas-solid suspension on the agglomerate size were investigated for the first time. Results showed that the average size of agglomerates decreased when increasing the gas velocity. In addition, the average agglomerate sizes decreased in the presence of isopropanol due to the weakening of van der Waals adhesion force. An overall agreement with an average error of 20 % was observed between the estimated agglomerate sizes and the experimental data.

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A settling tube to determine the terminal velocity and size distribution of fluidized nanoparticle agglomerates

Cited by 15 publications

References 24 publications

Modeling the size distribution in a fluidized bed of nanopowder

Modeling the size distribution in a fluidized bed of nanopowder

Experimental Investigation on Gas‐Solid Behavior in Fluidized Beds with Superfine Particles

Size of nanoparticle agglomerates in fluidization

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