Minimum fluidization velocity in a 3D fluidized bed modified with an acoustic field

Escudero, David R.; Heindel, Theodore J.

doi:10.1016/j.cej.2013.07.011

Cited by 24 publications

(24 citation statements)

References 22 publications

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“…Further studies of the effect of vibration on the fluidization behavior showed similar conclusions, in that both amplitude and frequency have crucial impacts on the fluidization of fine powder materials (Marring et al 1994;Barletta et al 2008). Escudero and Heindel (2013) claimed that the existence of a sound field could also effectively promote fluidization, and an increase in sound pressure and frequency could decrease the Umf values. The effect of high pressure on jetting bubble and solids behavior in a two-dimensional jetting fluidized bed was investigated by Li et al (2013), indicating that the excess gas velocity (U0 -Umf) and the jetting bubble size both became smaller along with the increase of pressure and solid holdup of the bubble increased at high pressure.…”

Section: Introductionmentioning

confidence: 58%

“…Sand samples with sizes of 30 to 40 mesh, 40 to 60 mesh, and 60 to 80 mesh were sieved and selected to study the influence of the particle size on fluidization and to determine the optimal amount of inert particles for biomass fluidization. The bed bulk density was determined according to the material mass and the static bed volume (Escudero and Heindel 2013). The properties of bed materials are shown in Table 1.…”

Section: Methodsmentioning

confidence: 99%

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Fluidization Behavior of Biomass Particles and its Improvement in a Cold Visualized Fluidized Bed

Wu¹,

Li²,

Song³

et al. 2017

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The fluidization behavior in a fluidized bed was visualized at room temperature under different conditions for two typical lignocellulosic biomass materials (rice husk and walnut shell) as representative samples of herbage and xylophyta, respectively. The effects of initial bed height, moisture content, and addition of sand particles on the quality of fluidization were analyzed, and the optimal operating parameters were determined. The initial bed height had a negligible effect on the minimum fluidization velocity but an obvious influence on bed stability. In addition, with an increase in moisture content, the minimum fluidization velocity showed the growth of an S-shaped curve and a constant decrease in the fluidization index in the fluidized region. Fluidization when performed on binary mixtures indicated that the proportion of sand-3 (60 to 80 mesh) in biomass and sand-3 in mixtures is a main factor contributing to the fluidizing quality of a bed. With larger proportions of sand-3, the fluidizing quality of the bed improved. Meanwhile, the differences in fluidization behavior between rice husk and walnut shell have been determined.

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Section: Introductionmentioning

confidence: 58%

Section: Methodsmentioning

confidence: 99%

Fluidization Behavior of Biomass Particles and its Improvement in a Cold Visualized Fluidized Bed

Wu¹,

Li²,

Song³

et al. 2017

BioResources

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“…Sound assisted fluidized beds have been studied in the literature because it has been shown that the inclusion of sound vibrations can help overcome fluidization problems in certain material types. Different behavior under sound vibrations have been observed by Leu et al [11], Guo et al [12], Kaliyaperumal et al [13], Levy et al [14], and Escudero and Heindel [15].…”

Section: Fedsm2014-21161mentioning

confidence: 82%

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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“…In order to determine the minimum fluidization velocity accurately, the widely used method [23] is performed. As shown in Fig.…”

Section: Fluidization Behaviorsmentioning

confidence: 99%

Experimental study on the fluidization behaviors of the superfine particles

Liu

Zhang

Chen

et al. 2015

Chemical Engineering Journal

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Minimum fluidization velocity in a 3D fluidized bed modified with an acoustic field

Cited by 24 publications

References 22 publications

Fluidization Behavior of Biomass Particles and its Improvement in a Cold Visualized Fluidized Bed

Fluidization Behavior of Biomass Particles and its Improvement in a Cold Visualized Fluidized Bed

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

Experimental study on the fluidization behaviors of the superfine particles

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