Computational fluid dynamics and electrostatic modeling of polymerization fluidized-bed reactors

Rokkam, Ram G.; Fox, Rodney O.; Mühle, Michael

doi:10.1016/j.powtec.2010.04.002

Cited by 111 publications

(78 citation statements)

References 44 publications

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“…This phenomenon of charge accumulation on the particles is usually unavoidable and undesirable in most dry particulate systems [1], which can lead to sparks, explosions, particle sheeting, agglomeration and even defluidization. Besides, the electrostatic charge generation will also affect the bubble dynamic behavior (such as size, shape) and the particle elutriation rates [2,3]. Although such phenomenon is unavoidable and usually acts as a disadvantage of fluidized bed operation, we can still try to utilize it and convert the harms to benefits.…”

Section: Introductionmentioning

confidence: 99%

“…Numerical simulation provides a viable alternative to study the electrostatic effects in gas-solid fluidized bed. Rokkam et al [2,24] used the Eulerian-Eulerian multi-fluid model coupled with electrostatic model to simulate the bipolar charging phenomenon in a gas-solid fluidized bed. The magnitude of electrostatic force was calculated based on the Lorentz force equation.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of external electric field on bubble and charged particle hydrodynamics in a gas–solid fluidized bed

Sun

Yang

Zhu

2015

Advanced Powder Technology

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of external electric field on bubble and charged particle hydrodynamics in a gas–solid fluidized bed

Sun

Yang

Zhu

2015

Advanced Powder Technology

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“…The predictions of the electrostatic model [59] the fluidized-bed depending upon the local potential, particle charge, particle polarity (bipolar charge effects) and can result in process upsets. CFD simulations can be used to predict regions of sheet formation and help reduce such process upsets.…”

Section: Discussionmentioning

confidence: 99%

Computational fluid dynamic modeling of fluidized-bed polymerization reactors

Rokkam

2012

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“…Electrostatic charge generation and accumulation on insulated particles are almost unavoidable due to repeated particle-particle and particle-wall frictions in the gas-solid fluidized bed. An excess accumulation of electrostatic charges will cause problems such as wall sheeting [2], particle agglomeration [3,4], and even spark generation or explosion hazards [5][6][7]. The generation and variation of electrostatic charge signals are significantly affected by bubble and particle motions inside the fluidized bed, which contain much dynamic information related to hydrodynamic behaviors.…”

Section: Introductionmentioning

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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Computational fluid dynamics and electrostatic modeling of polymerization fluidized-bed reactors

Cited by 111 publications

References 44 publications

Effects of external electric field on bubble and charged particle hydrodynamics in a gas–solid fluidized bed

Effects of external electric field on bubble and charged particle hydrodynamics in a gas–solid fluidized bed

Computational fluid dynamic modeling of fluidized-bed polymerization reactors

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

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