Detailed measurements of flow structure inside a dense gas–solids fluidized bed

He-hua, Zhu; Zhu, Jianbo; Li, Guozheng; Li, Fengyun

doi:10.1016/j.powtec.2007.02.043

Cited by 109 publications

(64 citation statements)

References 19 publications

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“…Using an optical probe, Zhu et al (2008) determined the solid concentration (the inverse of gas holdup) in a gas-solid system for bubbling and turbulent fluidization regimes.…”

Section: Gas Holdupmentioning

confidence: 99%

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Bed height and material density effects on fluidized bed hydrodynamics

Escudero

Heindel

2011

Chemical Engineering Science

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“…Using an optical probe, Zhu et al (2008) determined the solid concentration (the inverse of gas holdup) in a gas-solid system for bubbling and turbulent fluidization regimes.…”

Section: Gas Holdupmentioning

confidence: 99%

“…Moreover, Zhu et al (2008) studied the effects that changing the static bed height have on the solid concentration. Results showed that increasing the static bed height produced an increase in the solid concentrations mainly in the central region of the bed, while the wall region had no significant changes.…”

Section: Gas Holdupmentioning

confidence: 99%

Bed height and material density effects on fluidized bed hydrodynamics

Escudero

Heindel

2011

Chemical Engineering Science

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“…Laser Doppler velocimetry (LDV) can be employed to simultaneously obtain the velocity profiles of both gas and solid phases [31,32]. By inserting the optical fiber probes [33,34] into the fluidized bed, the received light reflected by moving particles is converted into voltage signals. The solids concentration can be obtained by calibrating the relationship between the output signals and the solids volume concentration, and the two sub-probes enable to measure the instantaneous local particle velocity with cross-correlation method [34].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…By inserting the optical fiber probes [33,34] into the fluidized bed, the received light reflected by moving particles is converted into voltage signals. The solids concentration can be obtained by calibrating the relationship between the output signals and the solids volume concentration, and the two sub-probes enable to measure the instantaneous local particle velocity with cross-correlation method [34]. Acoustic emission (AE) method has been applied to monitor the particle fluidization pattern and the activity of particle motions in the fluidized bed [35,36].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Monitoring of particle motions in gas-solid fluidized beds by electrostatic sensors

Yang

Zhang

et al. 2017

Powder Technology

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A C C E P T E D M A N U S C R I P TACCEPTED MANUSCRIPT Electrostatic charge signals in the fluidized bed contain much dynamic information on particle motions, which are poorly understood and explored. In this work, correlation velocities of Geldart B and D particles were measured, analyzed and compared by induced electrostatic sensors combined with cross-correlation method in the fluidized bed. The results indicated that the average correlation velocity of particle clouds increased and the normalized probability density distributions of correlation velocities broadened when the superficial gas velocity increased in the dense-phase region. Both upward and downward correlation velocities could be acquired in the dynamic bed level region. Under the same excess gas velocity, the average correlation velocity of Geldart D particles was significantly smaller than that of Geldart B particles, which was caused by the smaller bubble sizes caused by the dominant bubble split over coalescence and less volume of A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT 2 gas forming bubbles for Geldart D particles. The experimental results verified the reliability and repeatability of particle correlation velocity measurement by induced electrostatic sensors in the gas-solid fluidized bed, which provides definite potential in monitoring of particle motions.

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“…Two benchmark cases, namely the experimental measurements presented by Dubrawski et al [9] and Zhu et al [10], are considered. For the case of Dubrawski (case A, Figure 3(a)), the lower section bed is 0.96 m high and 0.133 m of diameter, and the upper section is 0.59 m high and 0.19 m of diameter, Dubrawski using different advanced experimental techniques in the "Traveling fluidized bed" to determine local voidage, bed expansion and so on.…”

Section: The Benchmark Simulation Setupmentioning

confidence: 99%

Triple Phase Simulation of Bubbling Fluidized Beds of Geldart “A” Particles with a Bubble-Based Drag Model

Wang¹,

Chen²

2017

dtcse

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Abstract.A triple-phase numerical model was developed for the simulations of gas-solid bubbling fluidized beds with Geldart "A" particles. In the model, the gas-solids suspension was modeled as a primary gas phase presented in the emulsion, a secondary gas phase presented in the bubble, and a third phase consisting of solids. A bubble-based drag model was derived taking into account of the heterogeneous flow structures of the emulsion phase. The KTGF model was used to describe the solid phase stresses. Simulations were conducted for two different scales bubbling fluidized beds of Group "A" particles. Mesh independences were confirmed up to a radial grid size of 200 times particle diameter, and the sensitivity of the transitional results on the time-steps was investigated. The predicted bed expansion and the voidage distribution, axial and radial solids volume fraction profiles, and the solids velocity vectors have been validated against literature data.

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Detailed measurements of flow structure inside a dense gas–solids fluidized bed

Cited by 109 publications

References 19 publications

Bed height and material density effects on fluidized bed hydrodynamics

Bed height and material density effects on fluidized bed hydrodynamics

Monitoring of particle motions in gas-solid fluidized beds by electrostatic sensors

Triple Phase Simulation of Bubbling Fluidized Beds of Geldart “A” Particles with a Bubble-Based Drag Model

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