Characteristic Features of Heat and Mass Transfer in a Fluidized Bed in a Vortex Chamber

Volchkov, É. P.; Dvornikov, N. A.; Yadykin, A. N.

doi:10.1615/heattransres.v34.i7-8.40

Cited by 12 publications

(8 citation statements)

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“…Particles will leave the bed with the gas through the central outlet if the drag force imparted by the gas flow overcomes the centrifugal force of the rotating particles. Fluid and particle dynamics in non-reacting flows in GSVRs have been studied by several researchers [17][18][19][20][21][22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Modeling fast biomass pyrolysis in a gas–solid vortex reactor

Ashcraft

Heynderickx

Marin

2012

Chemical Engineering Journal

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Section: Introductionmentioning

confidence: 99%

Modeling fast biomass pyrolysis in a gas–solid vortex reactor

Ashcraft

Heynderickx

Marin

2012

Chemical Engineering Journal

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“…The centrifugal forces in the VC can be much higher than the gravitational forces, resulting in high gas-solid slip velocities and the formation of a dense particle bed. These intensify the heat, mass, and momentum transfer [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Numerical Study toward Optimization of Spray Drying in a Novel Radial Multizone Dryer

et al. 2021

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In this paper, an intensified spray-drying process in a novel Radial Multizone Dryer (RMD) is analyzed by means of CFD. A three-dimensional Eulerian–Lagrangian multiphase model is applied to investigate the effect of solids outlet location, relative hot/cold airflow ratio, and droplet size on heat and mass transfer characteristics, G-acceleration, residence time, and separation efficiency of the product. The results indicate that the temperature pattern in the dryer is dependent on the solids outlet location. A stable, symmetric spray behavior with maximum evaporation in the hot zone is observed when the solids outlet is placed at the periphery of the vortex chamber. The maximum product separation efficiency (85 wt %) is obtained by applying high G-acceleration (at relative hot/cold ratio of 0.75) and narrow droplet size distribution (45–70 µm). The separation of different sized particles with distinct drying times is also observed. Smaller particles (<32 µm) leave the reactor via the gas outlet, while the majority of big particles leave it via the solids outlet, thus depicting in situ particle separation. The results revealed the feasibility and benefits of a multizone drying operation and that the RMD can be an attractive solution for spray drying technology.

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“…So taking as an example interfacial mass transfer with the amount of species A transferred between gas and particles per m³ reactor and per second written as k G •a V •(C A -C A s,s ), where k G is the coefficient of mass transfer in m³ fluid per m² interface per second, high-G operation allows increasing both k G and a V . Application to drying of granular materials, including biomass, was studied by Kochetov et al, 4 Volchkov et al 5,6 and Eliaers and De Wilde. 7 Eliaers et al 8 numerically studied optimization of the vortex chamber dryer design to improve the product quality/uniformity and the air usage efficiency.…”

Section: Introductionmentioning

confidence: 99%

Qualitative numerical study of simultaneous high-G-intensified gas–solids contact, separation and segregation in a bi-disperse rotating fluidized bed in a vortex chamber

Wilde

Richards

Benyahia

2016

Advanced Powder Technology

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Demonstration of simultaneous high-G-intensified gas-solids contact, gas-solids separation and segregation in a bi-disperse rotating fluidized bed in a vortex chamber by means of coupled discrete particle method -computational fluid dynamics simulations. Left: Gas entering through the tangential gas inlets slots and strong vortex in the near-chimney region; Right: Dense and uniform rotating fluidized bed of large/heavy particles against the cylindrical wall and somewhat less dense and faster rotating fluidized bed of small/light particles radially more inward. Black tracer to visualize the flow path of gas injected via one of the slots.

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Characteristic Features of Heat and Mass Transfer in a Fluidized Bed in a Vortex Chamber

Cited by 12 publications

References 0 publications

Modeling fast biomass pyrolysis in a gas–solid vortex reactor

Modeling fast biomass pyrolysis in a gas–solid vortex reactor

Numerical Study toward Optimization of Spray Drying in a Novel Radial Multizone Dryer

Qualitative numerical study of simultaneous high-G-intensified gas–solids contact, separation and segregation in a bi-disperse rotating fluidized bed in a vortex chamber

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