Flow pattern transition in a large jetting fluidized bed with double nozzles

Guo, Qingjie; Tao, Zhi; Yue, Guangxin; Liu, Zhenyu; Zhang, Jiyu

doi:10.1002/aic.690470609

Cited by 18 publications

(15 citation statements)

References 11 publications

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“…Guo, Tang, Yue, Liu, and Zhang (2001) distinguished the flow patterns as separated jets, flow transition, and jet coalescence based on the frame-by-frame analysis, which was supported by numerical simulation by Hong et al (2003) for two jets with equal velocities. Here a detailed description of the flow pattern in wider computational conditions is presented.…”

Section: Flow Patternmentioning

confidence: 99%

CFD simulation of a gas–solid fluidized bed with two vertical jets

et al. 2010

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Section: Flow Patternmentioning

confidence: 99%

CFD simulation of a gas–solid fluidized bed with two vertical jets

et al. 2010

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“…[35] The jet penetration depth is a key parameter to characterize the spouted gas flow, which increases with increasing jet gas velocity in the spout fluidized bed. The discrepancies among various models for predicting the jet penetration depth were essentially due to the different definitions of the jet boundary.…”

Section: Effect Of Particle Mass On Particle Circulation Patternmentioning

confidence: 99%

“…The flow pattern in a long vacuum cavity could be considered as a single jet, flow transition, and flow coalescence based on the frame-by-frame analysis, [35,36] which was simplified as a pseudo-2D cavity in this study.…”

Section: Effect Of Particle On Flow Stabilitymentioning

confidence: 99%

Numerical Investigation on Effect of Food Particle Mass on Spout Elevation of a Gas–Particle Spout Fluidized Bed in a Microwave–Vacuum Dryer

et al. 2014

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The effect of food particle mass on the instantaneous fluid dynamic characteristics of a gas-particle spout fluidized bed in a pulsed spouted microwave-vacuum drying (PSMVD) system was investigated by a numerical method. The spout fluidization process in a pseudo-2D spout fluidized bed was simulated by computational fluid dynamics (CFD) using the inviscid two-fluid theory method (TFM) based on the kinetic theory of granular flow. The effect of particle mass on the particle flow pattern, jet penetration depth, and pressure drop was evaluated. Under a specific particle mass, the spout velocity was an important factor controlling particle status in the spout fluidized bed and a critical velocity was identified for effective transition of the flow pattern. With an increase in particle mass, the spout velocity tended to increase to obtain the expected gas-particle flow pattern and the correlation between the particle mass and particle flow pattern was revealed. This research on the fluid dynamic characteristics of a gas-particle spout fluidized bed could be used to improve the uniformity of particle mixing and microwave heating.

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“…Such simplifications have included e.g. (i) a single central orifice [4][5][6][7][8][9][10][11], (ii) even gas distribution through a porous frit distributor [12,13] or (iii) two neighboring orifices [14][15][16]. Studies using setup (i) have focused largely on the lengths of the jets formed [2,4,5,11,[17][18][19] and have allowed to study the effect of aspect (1) on the geometry and dynamics of the void formed.…”

Section: Introductionmentioning

confidence: 99%

Regimes of jetting and bubbling in a fluidized bed studied using real-time magnetic resonance imaging

Penn

Boyce

Pruessmann

et al. 2020

Chemical Engineering Journal

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Real-time magnetic resonance imaging was used to study the different flow regimes which occur in a fluidized bed containing a gas injection system. The gas flow rates through the main distributor and a central orifice were varied independently. We identified six different regimes of bubbling and jetting behavior: (1) freely bubbling, (2) permanent jet, (3) spouting, (4) pulsating jet, (5) pulsating jet with bubble collapse and ( 6) pulsating jet and freely bubbling. While regimes (1-4) have been described previously in the literature, regimes ( 5) and ( 6) are described here for the first time. To construct a regime map, the Froude number (Fr) and the ratio of the superficial gas velocity to the minimum fluidization velocity (U/U mf ) were used to describe the system. We observed that bubbles formed predominantly, when U/U mf > 1. Further, we propose an empirical model that predicts the length of jets in the permanent jet regime as a function of Fr and background gas flow as. The proposed model is in good agreement with tomographic measurements in smaller 3D systems reported in the literature, indicating that the non-dimensionalized description of jet length using a Fr number is valid throughout a large range of system diameters. Moreover, the bubble breakoff frequency of the pulsating jet regime was assessed by Fourier analysis, demonstrating that the frequency increases with increasing Fr before plateauing.

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Flow pattern transition in a large jetting fluidized bed with double nozzles

Abstract: An experimental study was conducted in a 500 mm ID, 8,

Cited by 18 publications

References 11 publications

CFD simulation of a gas–solid fluidized bed with two vertical jets

CFD simulation of a gas–solid fluidized bed with two vertical jets

Numerical Investigation on Effect of Food Particle Mass on Spout Elevation of a Gas–Particle Spout Fluidized Bed in a Microwave–Vacuum Dryer

Regimes of jetting and bubbling in a fluidized bed studied using real-time magnetic resonance imaging

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