Comparison of three vibrational modes (twist, vertical and horizontal) for fluidization of fine particles

Mawatari, Yoshihide; Koide, Tetsu; Tatemoto, Yuji; Takeshita, Takenari; Noda, Katsuji

doi:10.1163/15685520052384998

Cited by 26 publications

(8 citation statements)

References 20 publications

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“…Vibration is commonly used to improve fluidization behavior, particularly for cohesive powders. Horizontal, twist or vertical vibrations can be applied [120]. In a vertically vibrated bed, oscillating the bottom distributor or the entire vessel transmits mechanical energy into the bottom of the bed, from which it propagates into the bulk.…”

Section: Pulsed and Vibro-fluidizationmentioning

confidence: 99%

Dynamically structured fluidization: Oscillating the gas flow and other opportunities to intensify gas-solid fluidized bed operation

Francia

Coppens

2021

Chemical Engineering and Processing - Process Intensification

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Section: Pulsed and Vibro-fluidizationmentioning

confidence: 99%

Dynamically structured fluidization: Oscillating the gas flow and other opportunities to intensify gas-solid fluidized bed operation

Francia

Coppens

2021

Chemical Engineering and Processing - Process Intensification

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“…Thereby, powders can be granulated with larger particles in order to enhance the fluidization, drying and coating process in the fluidized bed [13]. Otherwise, fluidization can also be assisted by a variety of mechanisms such as vibration, mechanical agitation, sound and magnetic force to improve the flowability of cohesive particles [6,14,15]. Such approaches are effective in the formation of coating layers, but they also have the disadvantage of limited application ranges.…”

Section: Introductionmentioning

confidence: 99%

Novel Technique for Coating of Fine Particles Using Fluidized Bed and Aerosol Atomizer

2020

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Fine particles are widely used in many industrial fields, and there are many techniques applied for these particles, like electroplating, and chemical and physical vapor deposition. However, in the food and pharmaceutical industries, most coating processes conducted with fluidized bed use core particles with a diameter larger than 200 μm, otherwise agglomerates are formed. This study contributes to the development of a new coating process for fine particles with diameters of around 50 μm. The innovation lies in the combined use of a Wurster fluidized bed and a novel aerosol atomizer. The feasibility of the operation is based on the application of the aerosol atomizer, which generates droplets smaller than 1 μm in diameter. A series of experiments with different coating solutions and glass beads in a 150 mm fluidized bed fed with droplet aerosol supplied from the cone chamber bottom is presented. The quality of the coating product is analyzed by scanning electron microscopy and CAMSIZER®. In this way, the influence of different conditions and core material properties on the product quality were determined. Experimental results showed the coating layer quality getting worse as coating solution viscosity became lower, meanwhile moderate process temperature was found to enhance coating layer formation and quality of that. It was also observed that lower aerosol feed rates help improve the yield of the process.

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“…Some works have also investigated the effect of different vibration modes (e.g. vertical, horizontal and twist vibrations) in a fluidized bed [12,30,40], revealing that both vertical and horizontal vibrations change the flow patterns and the bubble behavior in the bed. However, to the authors' best knowledge, experimental studies analyzing the bubble behavior in a vertically vibrated bed still remain scarce [28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Effect of vertical vibration and particle size on the solids hold-up and mean bubble behavior in a pseudo-2D fluidized bed

Cano-Pleite

Shimizu

Acosta-Iborra

et al. 2016

Chemical Engineering Journal

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The solids hold-up and mean bubble behavior in a vertically-vibrated fluidized bed are experimentally studied in the present work by means of Digital Image Analysis (DIA) for four different powders with Geldart classifications A, B and A/B. The bed has a small thickness (i.e. pseudo-2D bed) and operates in bubbling regime subject to a wide range of gas superficial velocities, vibration frequencies and vibration amplitudes.Mean parameters of the bed and the bubbles, such as solids hold-up, bubble fraction, bubble number density and bubble diameter and velocity, are characterized here by averaging the results over time and space. The results reveal that vibration of the bed promotes a confinement of the bubble path to the central section of the bed. This bubble confinement is more intense for the smallest particles tested and for high vibration strengths and creates two different bubble regimes in the bed. In particular, close to the distributor, the bubble velocity decreases when increasing the vibration amplitude of the bed vessel because bubbles are smaller and less confined, and they behave like isolated bubbles. The behavior of bubbles changes when they are far from the distributor, where the interaction between bubbles becomes greater due to their bigger size and the confinement of bubbles induced by vibration. This confinement promotes coalescence of bubbles.It is shown that consideration of these two different regimes of bubble dynamics allows to shed light on understanding the apparently contradictory results encountered in the literature regarding bubble behavior in bubbling vibrated fluidized beds.

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Comparison of three vibrational modes (twist, vertical and horizontal) for fluidization of fine particles

Cited by 26 publications

References 20 publications

Dynamically structured fluidization: Oscillating the gas flow and other opportunities to intensify gas-solid fluidized bed operation

Dynamically structured fluidization: Oscillating the gas flow and other opportunities to intensify gas-solid fluidized bed operation

Novel Technique for Coating of Fine Particles Using Fluidized Bed and Aerosol Atomizer

Effect of vertical vibration and particle size on the solids hold-up and mean bubble behavior in a pseudo-2D fluidized bed

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