Prediction of minimum fluidization velocity for vibrated fluidized bed

Mawatari, Yoshihide; Tatemoto, Yuji; Noda, Katsuji

doi:10.1016/s0032-5910(02)00323-6

Cited by 74 publications

(32 citation statements)

References 8 publications

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“…Several methods have been used to improve the quality of fluidization. Vibration (Mawatari et al, 2003) and agitation (Kim and Han, 2006) have been used in some designs to avoid unwanted phenomena as channeling or agglomeration in the fluidization of cohesive fine particles. With the same aim Quevedo et al (2006) employed a fluidized bed which consisted of a cylinder that acted as the gas distributor and rotated along its horizontal axis.…”

Section: Introductionmentioning

confidence: 99%

Bubble characteristics in a bubbling fluidized bed with a rotating distributor

Sobrino

Acosta-Iborra

Santana

et al. 2009

International Journal of Multiphase Flow

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In this paper the effect of a novel rotating distributor for fluidized beds on the bubble size is studied. The distributor is a perforated plate that rotates around the vertical axis of the column.The formation of the bubbles from the rotating distributor is theoretically analyzed. The pierced length of the bubbles ascending in the bed were measured using optical probes. The probability distribution of bubble diameter was inferred from these experimental measurements using the maximum entropy method. The radial profile of the bubble diameter is presented for the static and rotating configurations at different gas velocities. The frequency of bubble passage and the distribution of bubbles in the cross section of the bed bed are also reported. Results were finally shown for different heights above the distributor.A radial decrease in the bubble size when the distributor rotates is found. The bubble growth with the bed height is also lower in the rotating case.

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Section: Introductionmentioning

confidence: 99%

Bubble characteristics in a bubbling fluidized bed with a rotating distributor

Sobrino

Acosta-Iborra

Santana

et al. 2009

International Journal of Multiphase Flow

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“…In a fluidized bed, pulsation can be introduced by several methods: intermittent air supply, sonic waves or vibration. Vibrated beds [5][6][7] have been extensively tested to fluidize A and C particles. The vibration imparted to the bed breaks the stable fixed channels that appear when operating with these groups of particles, and a better mixing between gas and particles in the bed is achieved.…”

Section: Introductionmentioning

confidence: 99%

Fluidization of Group B particles with a rotating distributor

et al. 2008

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A novel rotating distributor fluidized bed is presented. The distributor is a rotating perforated plate, with 1% open-area ratio. This work evaluates the performance of this new design, considering pressure drop, Δp, and quality of fluidization. Bed fluidization was easily achieved with the proposed device, improving the solid mixing and the quality of fluidization.In order to examine the effect of the rotational speed of the distributor plate on the hydrodynamic behavior of the bed, minimum fluidization velocity, U mf , and pressure fluctuations were analyzed. Experiments were conducted in the bubbling free regime in a 0.19 m i.d. fluidized bed, operating with Group B particles according to Geldart's classification. The pressure drop across the bed and the standard deviation of pressure fluctuations, σ p , were used to find the minimum fluidization velocity, U mf . A decrease in U mf is observed when the rotational speed increases and a rise in the measured pressure drop was also found. Frequency analysis of pressure fluctuations shows that fluidization can be controlled by the adjustable rotational speed, at several excess gas velocities.Measurements with several initial static bed heights were taken, in order to analyze the influence of the initial bed mass inventory, over the effect of the distributor rotation on the bed hydrodynamics.

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“…4) performs satisfactorily in predicting pressure drop in packed bed that contains uniform and spherical particles (Cloete et al, 2015;Mawatari et al, 2003;Nemec et al, 2001). Several authors have however documented that this equation does not satisfactorily predict the pressure drop of bed consisting of non-uniform and non-spherical particles.…”

Section: Introductionmentioning

confidence: 99%

Modified Ergun Equation for Airflow through Packed Bed of Loblolly Pine Grinds

Olatunde¹,

Fasina

2019

KONA

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Biomass grinds are typically non-spherical and are composed of particles with wide range of sizes that may vary up to 10× between the smallest and largest particle. Since fluidized bed system is often used to convert biomass into fuels, chemicals and products, the viscous and kinetic energy losses' coefficients in the Ergun equation were determined to incorporate these unique characteristics of biomass grinds. The revised Ergun's equation, validated using loblolly pine wood grinds, and data from other published work resulted in estimated Ergun's K 1 and K 2 coefficients of 201 and 2.7 respectively. In addition, the relative mean deviation between experimental and predicted pressure drop was in general better with the modified Ergun's equation when compared to the original Ergun's equation.

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Prediction of minimum fluidization velocity for vibrated fluidized bed

Cited by 74 publications

References 8 publications

Bubble characteristics in a bubbling fluidized bed with a rotating distributor

Bubble characteristics in a bubbling fluidized bed with a rotating distributor

Fluidization of Group B particles with a rotating distributor

Modified Ergun Equation for Airflow through Packed Bed of Loblolly Pine Grinds

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