Fluidization of titania nanoparticle agglomerates in a bench-scale conical vessel

Bahramian, Alireza; Grace, John R.

doi:10.1016/j.powtec.2017.01.018

Cited by 9 publications

(15 citation statements)

References 42 publications

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“…For example, Wang et al 5 reported that Re in the settling processes of NP agglomerates with different sizes may reach up to 250. Bahramian and Grace 15 found that Re could be larger than 500 for the fluidization of the agglomerates of titania NPs. Only a few studies have been carried out for porous particles or grains at moderate Re until now.…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Analysis on the Hydrodynamic Behaviors of Nanoparticle Agglomerates at Moderate Reynolds Numbers

Liu

2020

Ind. Eng. Chem. Res.

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In this study, the hydrodynamic characteristics of agglomerates are studied experimentally for the Reynolds numbers (Re) up to ∼200, and their fluid dynamic behaviors are analyzed numerically taking their nonhomogeneous structures into account as 50 ≤ Re ≤ 400. The results show that both the Reynolds number and the fractal dimension (D f) of agglomerates significantly affect the flow field around and through the agglomerate. The drag ratios obtained from the numerical simulation show good agreement with the experimental data. The values of drag ratios are all lower than 1 at Re < ∼100 and are all larger than 1 for D f = 2.6 and 2.7 as Re > ∼100. A peak value in drag ratio is observed for D f = 2.6 as Re > 100. A new formula of drag ratio as a function of Re and D f is derived based on the simulated results. Comparisons with the homogeneous permeable sphere show that the effect of the radial variation of permeability on the drag force seems almost negligible in this range of moderate Reynolds numbers.

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Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Analysis on the Hydrodynamic Behaviors of Nanoparticle Agglomerates at Moderate Reynolds Numbers

Liu

2020

Ind. Eng. Chem. Res.

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“…It seems that fine particles occupy the voids between larger ones in the bed, and therefore, PSD becomes wider. However, a decrease in the void fraction of the bed caused by a wide PSD leads to a homogeneous fluidization regime . In contrast, a narrow-type PSD enhances bed stability and reduces the segregation of particles by size across the bed …”

Section: Resultsmentioning

confidence: 99%

“…A parallel three-fiber optical device with a probe tip diameter of 200 μm was used to measure the expanded bed heights h / h 0 of the bed by determining the mean solid volume fraction across the bed. A solid-state Nd:YAG laser was used as a light source with a frequency of 50 Hz and a beam voltage of 12 V. More details of the experimental procedure can be found in the literature. , …”

Section: Methodsmentioning

confidence: 99%

“…A solid-state Nd:YAG laser was used as a light source with a frequency of 50 Hz and a beam voltage of 12 V. More details of the experimental procedure can be found in the literature. 5,17 2.2. Particle Characterization.…”

Section: Methodsmentioning

confidence: 99%

“…Conical fluidized beds designed with a lower conical part and an upper cylindrical part have suitable fluidization characteristics of fluidized and spouted beds. − The conical fluidized beds can provide a suitable mixing of powders, creating homogeneity in heat and mass transfer in both chemical and physical techniques. − In addition, conical fluidized beds have been extensively employed in drying and mixing processes of fine, sticky, high-density and coarse particles in the chemical, pharmaceutical, and food industries. , The fluidization behavior of fine particles in conical fluidized beds is similar to that seen in the spouted beds, where particles move upward in the spout zone located around the axis of the bed, then reach the top of the bed material known as the fountain zone, and finally move downward in the region between the spout zone and wall, the so-called annular zone. − Based on the potential industrial applications, the conical fluidized beds facilitate the fluidization of bed materials containing a broad particle size distribution (PSD). ,,− …”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Particle Adhesion Effects on Particle Size Distribution of Titania Nanoparticle Agglomerates in a Conical Fluidized Bed: A Computational Fluid Dynamics and Discrete Element Method Adhesive Approach

Bahramian,

Olazar

2023

Ind. Eng. Chem. Res.

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Fluidization and Application of Carbon Nano Agglomerations

Chen,

Jiang,

Zhu

et al. 2023

Advanced Science

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Carbon nanomaterials are unique with excellent functionality and diverse structures. However, agglomerated structures are commonly formed because of small‐size effects and surface effects. Their hierarchical assembly into micro particles enables carbon nanomaterials to break the boundaries of classical Geldart particle classification before stable fluidization under gas‐solid interactions. Currently, there are few systematic reports regarding the structural evolution and fluidization mechanism of carbon nano agglomerations. Based on existing research on carbon nanomaterials, this article reviews the fluidized structure control and fluidization principles of prototypical carbon nanotubes (CNTs) as well as their nanocomposites. The controlled agglomerate fluidization technology leads to the successful mass production of agglomerated and aligned CNTs. In addition, the self‐similar agglomeration of individual ultralong CNTs and nanocomposites with silicon as model systems further exemplify the important role of surface structure and particle‐fluid interactions. These emerging nano agglomerations have endowed classical fluidization technology with more innovations in advanced applications like energy storage, biomedical, and electronics. This review aims to provide insights into the connections between fluidization and carbon nanomaterials by highlighting their hierarchical structural evolution and the principle of agglomerated fluidization, expecting to showcase the vitality and connotation of fluidization science and technology in the new era.

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Fluidization of titania nanoparticle agglomerates in a bench-scale conical vessel

Cited by 9 publications

References 42 publications

Numerical and Experimental Analysis on the Hydrodynamic Behaviors of Nanoparticle Agglomerates at Moderate Reynolds Numbers

Numerical and Experimental Analysis on the Hydrodynamic Behaviors of Nanoparticle Agglomerates at Moderate Reynolds Numbers

Particle Adhesion Effects on Particle Size Distribution of Titania Nanoparticle Agglomerates in a Conical Fluidized Bed: A Computational Fluid Dynamics and Discrete Element Method Adhesive Approach

Fluidization and Application of Carbon Nano Agglomerations

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