Investigation on the Drying Kinetics in a Pulsed Fluidized Bed

Li, Zhanyong; Kobayashi, Noriyuki; Deguchi, Seiichi; Hasatani, Masanobu

doi:10.1252/jcej.37.1179

Cited by 16 publications

(12 citation statements)

References 9 publications

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“…The simulated pressure drop at minimum spouting velocity is 3000 Pa, which also agrees well with the measured data of 3.0 kPa. The details of other comparisons between the predicted and experimental results can be found in Li et al [20] and Simons. [21] Hence, the above CFD model was fully validated in this work.…”

Section: Results and Discussion Model Validationmentioning

confidence: 97%

“…In our previous work, [20,21] the above CFD model was used to investigate the gas-particle flow behaviors in cylindrical spouted beds [39,40] and a 3D spout-fluid bed. [41,42] The predicted axial and radial velocity distribution, bed pressure drop, mass flow rate, etc., are in good agreement with the published experimental data.…”

Section: Results and Discussion Model Validationmentioning

confidence: 99%

“…[6] Carrot cubes and spent grains from breweries are examples of materials that are not easily fluidized but can be dried under pulsed fluidization. [7] Due to these merits, many research efforts have been devoted to various aspects associated to pulsed fluidization; e.g., hydrodynamic characteristics, [8] mass oscillation [9] and transfer, [10] heat transfer, [11] numerical models [3,12,13] and simulation, [6,14] and many other industrial applications such as drying, [15][16][17][18][19][20] etc. There have been many experimental studies of pulsed fluidized beds, but the theoretical understanding of pulsed fluidized beds is far from complete.…”

Section: Investigation Of Flow Behaviors and Bubble Characteristics Omentioning

confidence: 99%

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Investigation of Flow Behaviors and Bubble Characteristics of a Pulse Fluidized Bed via CFD Modeling

Zong-hua

et al. 2009

Drying Technology

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The bubbling flow in a 2D pulsed fluidized bed is simulated using a developed Eulerian-Eulerian two-fluid modeling approach. Parametric studies are carried on for pulsed inflow of the gas phase with rectangular and sawtooth patterns where three pulsating frequencies of 0.4, 4, and 40 Hz are used. The flow instabilities are observed to develop in the pulsed fluidized bed and the mechanisms leading to the instabilities are discussed. The formation, coalescence, split-up of air bubbles, and their trailing wakes inside the bed are described and discussed in detail. Bubble rising velocity and size are obtained and analyzed. Bed expansion and fluctuation ratio are calculated to evaluate the pulsed fluidization quality. Numerical results improve the understanding of the pulsed fluidization.

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Section: Results and Discussion Model Validationmentioning

confidence: 97%

Section: Results and Discussion Model Validationmentioning

confidence: 99%

Section: Investigation Of Flow Behaviors and Bubble Characteristics Omentioning

confidence: 99%

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Investigation of Flow Behaviors and Bubble Characteristics of a Pulse Fluidized Bed via CFD Modeling

Zong-hua

et al. 2009

Drying Technology

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“…Akhavan et al [14] showed that gas pulsation is useful in overcoming plug formation and channelling in the fluidization of nanoparticles. Akhavan et al [15] and Li et al [16] report that the drying of either porous pharmaceutical granules or large particles in a cylindrical fluidized bed become enhanced by pulsating the inlet gas flow. For cooling and drying operations of granules in a pulsed fluidized bed (PFB) with a relocated gas stream, Gawrzynski and Glaser [17] have shown that the gas consumption gets substantially reduced while achieving the uniform bed structure and increased stability of the product in the system.…”

Section: Introductionmentioning

confidence: 99%

Computational fluid dynamic simulations of regular bubble patterns in pulsed fluidized beds using a two‐fluid model

et al. 2021

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This simulation study explores the two-fluid model's (TFM) capability to reproduce the alternating bubble patterns in a sinusoidal pulsed fluidized bed (PFB). Simulations were performed with frictional limits ranging between 0.58-0.62 with the inlet gas frequency being varied in the range of 3-6 Hz. The preliminary investigations showed that the Johnson and Jackson frictional model with a frictional limit of 0.61 yields a regular bubble pattern. The inference of this regular bubble pattern was based on the discrete Fourier analysis of the temporal pressure signals obtained at different spatial locations inside the PFB. Although the one-dimensional temporal pressure signals character-Zhizhong Ding and Shashank S. Tiwari have contributed equally.

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“…Besides relying on improving the design of gas distributors and operated at high flow rates, pulsation and vibration have been commonly used in granulation, coating and drying of sticky powders and irregularly shaped agricultural products [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27]. Pulsed fluidized beds, in which the gas flow rate oscillates periodically with time, have been proven effective in transforming random and chaotic bubble behavior into regular and ordered patterns, improving the fluidization quality of coarse particles greatly [28].…”

Section: Introductionmentioning

confidence: 99%

Fluidization and drying of biomass particles in a vibrating fluidized bed with pulsed gas flow

Jia

Cathary

Peng

et al. 2015

Fuel Processing Technology

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a b s t r a c tFluidization of biomass particles in the absence of inert bed materials has been tested in a pulsed fluidized bed with vibration, with the pulsation frequency ranging from 0.33 to 6.67 Hz. Intermittent fluidization at 0.33 Hz and apparently 'normal' fluidization at 6.67 Hz with regular bubble patterns were observed. Pulsation has proven to be effective in overcoming the bridging of irregular biomass particles induced by strong inter-particle forces. The vibration is only effective when the pulsation is inadequate, either at too low a frequency or too low in amplitude. Drying of biomass has been carried out to quantify the effectiveness of gas pulsation for fluidized bed dryers and torrefiers in terms of gas-solid contact efficiency and heat and mass transfer rates. The effects of gas flow rate, bed temperature, pulsation frequency and vibration intensity on drying performance have been systematically investigated. While higher temperature and gas flow rate are favored in drying, there exists an optimal range of pulsation frequency between 0.75 Hz and 1.5 Hz where gas-solid contact is enhanced in both the constant rate drying and falling rate drying periods.

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Investigation on the Drying Kinetics in a Pulsed Fluidized Bed

Cited by 16 publications

References 9 publications

Investigation of Flow Behaviors and Bubble Characteristics of a Pulse Fluidized Bed via CFD Modeling

Investigation of Flow Behaviors and Bubble Characteristics of a Pulse Fluidized Bed via CFD Modeling

Computational fluid dynamic simulations of regular bubble patterns in pulsed fluidized beds using a two‐fluid model

Fluidization and drying of biomass particles in a vibrating fluidized bed with pulsed gas flow

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