The influence of the frequency of acoustic waves on sound-assisted fluidization of beds of fine particles

Russo, Paola; Chirone, Riccardo; Massimilla, L.; Russo, S.

doi:10.1016/0032-5910(94)02931-d

Cited by 60 publications

(37 citation statements)

References 17 publications

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“…[15]. Both studies revealed the same trends shown in Figure 4 -a reduction in the Umr value until a certain frequency, and then an increase in the minimum fluidization.…”

Section: Effect Of Frequency On the Minimum Fluidizationsupporting

confidence: 69%

“…Leu et al [9] and Russo et al [15] proved that as the weight of the bed changed in a sound-assisted fluidized bed, the minimum fluidization velocity over the entire frequency range of their studies changed (Figure 7). Also, they showed that the change in the bed weight does not influence the trend exhibited by the minimum fluidization velocity as a function of frequency, and their results showed similar trends as the ones shown in Figure 8.…”

Section: Effect Of Frequency On the Minimum Fluidizationmentioning

confidence: 97%

“…Also, they showed that the change in the bed weight does not influence the trend exhibited by the minimum fluidization velocity as a function of frequency, and their results showed similar trends as the ones shown in Figure 8. The possible explanation for this behavior is that the increase in the sound attenuation due to the larger amount of solids decreases the average SPL under which beds of different weights are operated [ 15].…”

Section: Effect Of Frequency On the Minimum Fluidizationmentioning

confidence: 99%

“…Cranfield and Geldart [7] studied the fluidization characteristics of large particles (1000-2000 f!m) of alkalized alumina in a fluidized bed with a cross-sectional area of 61 x61 em at different bed heights (5,10,15,20,25, and 30 em). They showed that for 3D beds, the minimum fluidization velocity remained constant no matter the bed height used in the experiments.…”

Section: Introductionmentioning

confidence: 99%

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Acoustic Field Effects on Minimum Fluidization Velocity in a 3D Fluidized Bed

Escudero

Heindel

2012

Volume 2: Fora

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Fluidized beds are used in a variety of process industries because they provide uniform temperature distributions, low pressure drops, and high heat/mass rates. Minimum fluidization velocity is an important factor in understanding the hydrodynamic behavior of fluidized beds, and this characteristic may be modified through high frequency (sound) vibrations. The effects caused by sound wave frequency on the minimum fluidization velocity in a 3D fluidized bed are investigated in this study. Experiments are carried out in a 10.2 cm ID cold flow fluidized bed filled with glass beads with material density of 2600 kg/m 3 , and particles sizes ranging between 212-600 μm. In this study, four different bed height-to-diameter ratios are examined: H/D = 0.5, 1, 1.5, and 2. Moreover, the sound frequency of the loudspeaker used as the acoustic source ranges between 50-200 Hz, with a sound pressure level fixed at 110 dB. Results show that the minimum fluidization velocity is influenced by the frequency change. As the frequency increases, the minimum fluidization velocity decreases until a specific frequency is reached, beyond which the minimum fluidization velocity increases. Thus, acoustic fields provide an improvement in the ease of fluidization of these particles. ABSTRACT Fluidized beds are used in a variety of process industries because they provide uniform temperature distributions, low pressure drops, and high heat/mass rates. Minimum fluidization velocity is an important factor in understanding the hydrodynamic behavior of fluidized beds, and this characteristic may be modified through high frequency (sound) vibrations. The effects caused by sound wave frequency on the minimum fluidization velocity in a 3D fluidized bed are investigated in this study. Experiments are carried out in a 10.2 em ID cold flow fluidized bed filled with glass beads with material density of 2600 kg/m 3 , and particles sizes ranging between 212-600 J.lm. In this study, four different bed height-todiameter ratios are examined: HID = 0.5, 1, 1.5, and 2. Moreover, the sound frequency of the loudspeaker used as the acoustic source ranges between 50-200 Hz, with a sound pressure level fixed at 110 dB. Results show that the minimum fluidization velocity is influenced by the frequency change. As the frequency increases, the minimum fluidization velocity decreases until a specific frequency is reached, beyond which the minimum fluidization velocity increases. Thus, acoustic fields provide an improvement in the ease of fluidization of these particles.

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“…[15]. Both studies revealed the same trends shown in Figure 4 -a reduction in the Umr value until a certain frequency, and then an increase in the minimum fluidization.…”

Section: Effect Of Frequency On the Minimum Fluidizationsupporting

confidence: 69%

Section: Effect Of Frequency On the Minimum Fluidizationmentioning

confidence: 97%

Section: Effect Of Frequency On the Minimum Fluidizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Acoustic Field Effects on Minimum Fluidization Velocity in a 3D Fluidized Bed

Escudero

Heindel

2012

Volume 2: Fora

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“…Russoetal. [7] reported the effects of bed weight and intensity of the acoustic field (from no sound to sound pressure level-SPL,at140dB).The maintained constant frequency 120 Hz in all the experiments. The results of the experiment showed, for a certain bed weight, an acoustic field of appropriate SPL changes the channeling typically observed with group C cohesive powders into the homogeneous bubble free bed.…”

confidence: 99%

Sound Assisted Fluidized Bed and its Effects on Micro Particles

Shakebuddin¹

2018

IJRASET

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The aim of this research work is to improve the quality of fluidization of fine powders (cohesive powder) with the help of sound assisted fluidization. The work presents the main results obtained in the field of sound assisted fluidization of fine particles. Our aim is to emphasize on the role of acoustic fields in enhancing the gas-solid contact efficiency, we have characterized the fluidization behavior of bentonite powders in terms of pressure drops, minimum fluidization, bed expansion, and velocity as affected by acoustic fields of different intensity and frequency. Remarkable effect was noted after application of sound intensity with decrease in minimum fluidization velocity and with good bed expansion.

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