Experimental Investigation of Particle Size Effect on Agglomeration Behaviors in Gas–Solid Fluidized Beds

Wang, Jingdai; Shi, Qiang; Huang, Zhengliang; Gu, Yubin; Lungu, Musango; Yang, Yongrong

doi:10.1021/acs.iecr.5b02548

Cited by 19 publications

(25 citation statements)

References 23 publications

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“…8(a-c), that the collision frequency, 0 / N N col , the collision efficiency, 0 / N N agg , and the agglomeration rate, col agg N N / , all decrease with an increase in particle size, p d . These results are in qualitative agreement with theory and with observations reported elsewhere 2,21,24,45,46 .…”

Section: Effect Of Particle Size On Particle-particle Interactionssupporting

confidence: 93%

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Simulation of deterministic energy-balance particle agglomeration in turbulent liquid-solid flows

Njobuenwu

Fairweather

2017

Physics of Fluids

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An efficient technique to simulate turbulent particle-laden flow at high mass loadings within the four-way coupled simulation regime is presented. The technique implements large-eddy simulation, discrete particle simulation, a deterministic treatment of inter-particle collisions and an energy-balanced particle agglomeration model. The algorithm to detect inter-particle collisions is such that the computational costs scale linearly with the number of particles present in the computational domain.On detection of a collision, particle agglomeration is tested based on the pre-collision are more frequent and efficient in forming agglomerates than those of coarser particles.The particle-particle interaction events show a strong dependency on the shear Reynolds number Re , while increasing the particle concentration effectively enhances particle collision and agglomeration whilst having only a minor influence on the agglomeration rate. Overall, the sensitivity of the particle-particle interaction events to the selected simulation parameters is found to influence the population and distribution of the primary particles and agglomerates formed.2

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Section: Effect Of Particle Size On Particle-particle Interactionssupporting

confidence: 93%

“…According to theory 21,46 , the kinetic energy between colliding coarse particles is high, whilst that between fine and coarse particles is slightly less, and that between fine…”

Section: Effect Of Particle Size On Particle-particle Interactionsmentioning

confidence: 99%

Simulation of deterministic energy-balance particle agglomeration in turbulent liquid-solid flows

Njobuenwu

Fairweather

2017

Physics of Fluids

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“…Porosity of particles can enhance their aerosol performance (45). F4 and F5 were small and spherical with apparently smooth surfaces and evidence of particle agglomeration (Figure 1d, e), possibly due to high surface energy of the particles, which commonly increases cohesiveness and compromises flowability (46)(47)(48).…”

Section: Morphology Of Spray-dried Proliposome Particlesmentioning

confidence: 99%

Spray-Dried Proliposome Microparticles for High-Performance Aerosol Delivery Using a Monodose Powder Inhaler

et al. 2018

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Proliposome formulations containing salbutamol sulphate (SS) were developed using spray drying, and the effects of carrier type (lactose monohydrate (LMH) or mannitol) and lipid to carrier ratio were evaluated. The lipid phase comprised soy phosphatidylcholine (SPC) and cholesterol (1:1), and the ratios of lipid to carrier were 1:2, 1:4, 1:6, 1:8 or 1:10 w/w. X-ray powder diffraction (XRPD) revealed an interaction between the components of the proliposome particles, and scanning electron microscopy (SEM) showed that mannitol-based proliposomes were uniformly sized and spherical, whilst LMH-based proliposomes were irregular and relatively large. Using a two-stage impinger (TSI), fine particle fraction (FPF) values of the proliposomes were higher for mannitol-based formulations, reaching 52.6%, which was attributed to the better flow properties when mannitol was used as carrier. Following hydration of proliposomes, transmission electron microscopy (TEM) demonstrated that vesicles generated from mannitol-based formulations were oligolamellar, whilst LMH-based proliposomes generated 'worm-like' structures and vesicle clusters. Vesicle size decreased upon increasing carrier to lipid ratio, and the zeta potential values were negative. Drug entrapment efficiency (EE) was higher for liposomes generated from LMH-based proliposomes, reaching 37.76% when 1:2 lipid to carrier ratio was used. The in vitro drug release profile was similar for both carriers when 1:6 lipid to carrier ratio was used. This study showed that spray drying can produce inhalable proliposome microparticles that can generate liposomes upon contact with an aqueous phase, and the FPF of proliposomes and the EE offered by liposomes were formulation-dependent.

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“…control the local air velocity for a circulated fluidized bed (CFB). For a gas-solid fluidized bed (FB), Wang et al [9] found that small particles caused agglomerates more easily than common particles and the collisions among small-small particles or small-common particles were very regular and effective than that of common-common particles. Johari and Taib [10] found that fluidization quality was affected by the mean sand size being used and by the column size but it was not affected by the shape of the column being used.…”

Section: Introductionmentioning

confidence: 99%

Performance Study of an Inclined Bubbling Fluidized Bed Dryer During Cashew Nut Drying

Das¹,

Mahanta²,

Sinha³

et al. 2021

Lecture Notes in Mechanical Engineering

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Raw cashew nuts were dried in a bubbling fluidized bed dryer at ambient temperature (an average of 32 °C) with bed inclinations of 0°, 15°and 30°using perforated (18.85%) and semi-circular (50%) opening distributor plates. The superficial velocity ranged from 1.4 m/s to 3.2 m/s for batch sizes of 0.5, 1, 2 and 2 kg raw cashew nuts + 2 kg sand. Raw cashew nuts alone and cashew nuts mixed with sand were taken for finding different hydrodynamic behaviour and energy consumptions. Samples were collected at 0, 30, 60 and 90 min intervals for moisture content removal measurement with air velocity of 2.5 m/s. When fluidized alone, the highest fluidization height of raw cashew nuts was 0.31 m for 2 kg inventory but when mixed with sand it was found 0.48 m at 15°bed inclination with air velocity as 2.5 m/s in 50% opening distributor plate. Average moisture removal was found to be 14.097 and 16.422% in semi-circular and perforated distributor plates respectively.

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Experimental Investigation of Particle Size Effect on Agglomeration Behaviors in Gas–Solid Fluidized Beds

Cited by 19 publications

References 23 publications

Simulation of deterministic energy-balance particle agglomeration in turbulent liquid-solid flows

Simulation of deterministic energy-balance particle agglomeration in turbulent liquid-solid flows

Spray-Dried Proliposome Microparticles for High-Performance Aerosol Delivery Using a Monodose Powder Inhaler

Performance Study of an Inclined Bubbling Fluidized Bed Dryer During Cashew Nut Drying

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