Motion of solids, jetting and bubbling dynamics in a large jetting fluidized bed

Ettehadieh, B.; Yang, W.‐C.; Haldipur, G.B.

doi:10.1016/0032-5910(88)80054-8

Cited by 10 publications

(6 citation statements)

References 11 publications

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“…In this study, only the spout has bubble formation frequencies near 5−8 Hz. The bubble frequency measured by Ettehadieh et al in the upper portion of an 8-m-high, 3-m-diameter jetting fluidized bed was in the range 0−1 Hz, which is near the bubble frequency in the jet flow pattern of the present work. The lower bubble frequency measured in this study and in Ettehadieh's work 17 can be attributed to the dominant effect of the larger bed diameter and larger nozzle diameter.…”

Section: Resultssupporting

confidence: 67%

“…The bubble frequency measured by Ettehadieh et al 17 in the upper portion of an 8-m-high, 3-m-diameter jetting fluidized bed was in the range 0-1 Hz, which is near the bubble frequency in the jet flow pattern of the present work. The lower bubble frequency measured in this study and in Ettehadieh's work 17 can be attributed to the dominant effect of the larger bed diameter and larger nozzle diameter. As discussed above, higher jet gas velocities and lower static bed heights often cause spouts, short circuiting much of the reaction gas and steam.…”

Section: Effect Of Jet Gas Velocity and Static Bedsupporting

confidence: 66%

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Gas Discharge Patterns in a Large Jetting Fluidized Bed with a Vertical Nozzle

Guo

Yue

Liu

2001

Ind. Eng. Chem. Res.

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The gas discharge patterns, a jet and a spout, generated by a vertical nozzle in an 8-m-high, 0.5-m-diameter jetting fluidized bed were investigated using frame-by-frame analysis and Sth VCD software analysis. The static bed height was varied from 0.38 to 0.66 m, and the nozzle jet velocity was varied from 16.1 to 64.26 m/s. A correlation was developed using experimental data to predict the transition of the flow pattern from a jet to a spout. The study shows that the major frequency in the power spectrum density function agrees with the jet collapse frequency measured by frame-by-frame analysis and Sth VCD software analysis. The major frequency in the power spectrum density function increases with increasing jet gas velocity. In addition, the jet velocity at the critical point in the curve of the major frequency versus the jet gas velocity corresponds to the gas velocity for the transition from a jet to a spout.

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Section: Resultssupporting

confidence: 67%

Section: Effect Of Jet Gas Velocity and Static Bedsupporting

confidence: 66%

Gas Discharge Patterns in a Large Jetting Fluidized Bed with a Vertical Nozzle

Guo

Yue

Liu

2001

Ind. Eng. Chem. Res.

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“…The jet formation frequency in a large jetting fluidized bed with a Ž . single nozzle was reported by Ettehadieh et al 1988 and Ž . Guo et al 1999 to be much smaller than the 5᎐8 Hz mea-Ž .…”

Section: Experimental Apparatusmentioning

confidence: 87%

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

et al. 2001

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“…Jetting has been studied extensively in the gas-solid fluidized bed literature; see for example Yang and Keairns [1] , Ettehadieh et al [2], Guo et al [3,4], Chen et al [5], or Muller et al [6]. However, most of the studies focused on jetting produced by using a central vertical nozzle or focused on jetting produced by a horizontal nozzle penetrating a lightly fluidized bed.…”

Section: Introductionmentioning

confidence: 99%

Characterizing Jetting in an Acoustic Fluidized Bed Using X-Ray Computed Tomography

Escudero

Heindel

2015

Journal of Fluids Engineering

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Understanding the jetting phenomena near the gas distributor plate in a fluidized bed is important to gas–solid mixing, heat and mass transfer, and erosion to any bed internals, which can all affect the performance of the bed. Moreover, acoustic vibration in a fluidized bed can be used to enhance the fluidization quality of the particulate matter and influence the jetting behavior. Characterizing the jetting structure using X-ray computed tomography (CT) in a three-dimensional (3D) fluidized bed, with and without acoustic intervention, is the focus of this study. A 10.2 cm ID fluidized bed filled with glass beads and ground walnut shell, with material densities of 2500 kg/m3 and 1440 kg/m3, respectively, and particle sizes ranging between 212 and 600 μm, is used in these experiments. X-ray CT imaging is used to determine local time-average gas holdup. From this information, qualitative and quantitative characteristics of the hydrodynamic structure of the multiphase flow system are determined. Local time-average gas holdup images of the fluidized bed under acoustic intervention at a high superficial gas velocity show that jets produced near the aeration plate merge with other jets at a higher axial position of the bed compared to the no acoustic condition. Acoustic fluidized beds also have a fewer number of active jets than the no acoustic fluidized bed, which allowed for a more homogeneous gas holdup region deep in the bed. Hence, the acoustic presence has a significant effect on the jetting phenomena near the aeration plate in a fluidized bed.

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Motion of solids, jetting and bubbling dynamics in a large jetting fluidized bed

Cited by 10 publications

References 11 publications

Gas Discharge Patterns in a Large Jetting Fluidized Bed with a Vertical Nozzle

Gas Discharge Patterns in a Large Jetting Fluidized Bed with a Vertical Nozzle

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

Characterizing Jetting in an Acoustic Fluidized Bed Using X-Ray Computed Tomography

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