Effect of particle diameter on fluidization under vibration

Mawatari, Yoshihide; Koide, Tetsu; Tatemoto, Yuji; Uchida, Shigeo; Noda, Katsuji

doi:10.1016/s0032-5910(01)00432-6

Cited by 61 publications

(29 citation statements)

References 15 publications

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“…electromagnetic field, acoustic and mechanical agitation and centrifugal field [6]. Among those, mechanical vibration can significantly reduce the occurrence of channelling compared to that in the conventional fluidised beds [7][8][9][10][11][12][13]. Other advantages include reduced minimum fluidisation velocity and elutriation.…”

Section: Introductionmentioning

confidence: 99%

Fluidisation behaviour of silica nanoparticles under horizontal vibration

Zhang¹,

Zhao²

2010

Journal of Experimental Nanoscience

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In present study, fluidization behaviour of silica nanoparticles with primary size between 7 and 16nm under horizontal vibration was investigated. Fluidization characteristics were assessed by observing pressure drop, bed expansion and bed collapse behaviour at the vibration frequencies between 0 and 34 Hz. Horizontal vibration is demonstrated to be as effective as the vertical configuration reported previously in terms of fluidization improvement. In all cases, smooth agglomerate particulate fluidization was observed at vibrational frequencies greater than 16.7 Hz as long as the vibrational amplitude is set to be more than 1. This is much lower than previous reported value, and suggests that fluidization assisted with horizontal vibration is a promising technique for the large scale processing of nanomaterials (e.g. reacting, dispersing, or coating).

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Section: Introductionmentioning

confidence: 99%

Fluidisation behaviour of silica nanoparticles under horizontal vibration

Zhang¹,

Zhao²

2010

Journal of Experimental Nanoscience

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“…Noda et al (1998) gave the flow patterns of fine particles in a vibrating fluidized bed under atmospheric or reduced pressure. Mawatari et al (2002bMawatari et al ( , 2003 examined the effects of vibration and particle diameter on flow patterns and fluidization characteristics, including minimum fluidization velocity, voidage and the bed expansion ratio for…”

Section: Introductionmentioning

confidence: 99%

The effect of vibration on bed voidage behaviors in fluidized beds with large particles

Jin

Zhang

2007

Braz. J. Chem. Eng.

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-The effects of vibration parameters, operating conditions and material properties on bed voidage were investigated using an optical fiber probe approach in a vibrating fluidized bed with a diameter of 148 mm. Variables studied included frequency (0-282 s -1 ), amplitude (0 mm-1 mm), bed height (0.1 m-0.4 m) as well as four kinds of particles (belonging to Geldart's B and D groups). The axial and radial voidage distribution with vibration is compared with that without vibration, which shows vibration can aid in the fluidization behaviors of particles. For a larger vibration amplitude, the vibration seriously affects bed voidage. The vibration energy can damp out for particle layers with increasing the bed height. According to analysis of experimental data, an empirical correlation for predicting bed voidage, giving good agreement with the experimental data and a deviation within ±15%, was proposed.

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“…To fluidize the bed of these particles, a vibrated fluidized bed has been applied to some industries (Mori et al, 1990), and some workers have studied the vibrated fluidized bed (Gupta and Mujumdar, 1980;Jataiz et al, 1992;Maring et al, 1994;Tatemoto et al, 2001;Zhou et al, 2002;Mawatari et al, 2002). When the vibration is added to the particle bed, the minimum fluidization velocity becomes smaller ( Maring et al, 1994;Mawatari et al, 2003) and the vibration gap, which is the gap between particle bed and wall, appears .…”

Section: Introductionmentioning

confidence: 99%

“…When the stable agglomerates are not formed or the cohesive force between particles (or agglomerates) is large, particles are fixed in the bed without vibration. Even in this case, the particles move in the bed when the vibration is added to the bed (Mawatari et al, , 2002. Though there is no bubble in the bed, the fluidization can be identified by measuring the pressure loss in bed (Mawatari et al, , 2002.…”

Section: Introductionmentioning

confidence: 99%