A variable-thickness two-dimensional bed for investigating gas—solid fluidized bed hydrodynamics

Kathuria, Dhruva; Saxena, S.C.

doi:10.1016/0032-5910(87)85002-7

Cited by 14 publications

(12 citation statements)

References 8 publications

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“…Finally, the dashed line represents the data obtained by Geldart [24] who studied the variation in U mf, 2D at fixed bed heights of 5 80cm, and maintained a constant particle size and bed thickness. The other data [23,32,34,35] shown in Fig. 5 were not in agreement with the results of the proposed equation.…”

Section: Resultscontrasting

confidence: 48%

“…To measure the minimum fluidization velocity, the procedure described by Kathuria and Saxena [32] was employed. First, the pressure drop between the plenum and the outlet of the bed was measured at different superficial gas velocities to obtain the characteristic curve of the empty system, as described in the previous section.…”

Section: Resultsmentioning

confidence: 99%

“…(2) to the experimental data obtained in the present study, the circles represent the experimental data of the current investigation and the dashed line represents the results obtained by Geldart [24] who varied the bed height h at a constant d p /t. ○ = data obtained in the present study (Table 2), × = data obtained by Busciglio et al [15], ◊ = data obtained by Saxena and Jadav [33], □ = data obtained by Rowe and Everett [23], ▼ = data obtained by Kathuria and Saxena [32], ♦ data obtained by Saxena and Jadav [33], ▲ = data obtained by Glicksman and McAndrews [34], ◄ = data obtained by Mudde et al [35], ► = data obtained by Geldart [24], ■ = data obtained by Rowe and Everett [23].…”

Section: Wall Effects During the Defluidization Fluidization Processmentioning

confidence: 98%

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On the minimum fluidization velocity in 2D fluidized beds

et al. 2011

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a b s t r a c tIn the present study, a new correlation for the determination of the minimum fluidization velocity in 2D fluidized beds was developed. The proposed correlation was based on the experimental results obtained in 2D fluidized beds with different particle sizes, bed thicknesses and bed heights. Thus, the proposed correlation depends only on the nondimensional variable t/d p , where t is the bed thickness and d p is the particle size. The proposed correlation was compared with other experimental results that can be found in the literature, and two different trends were observed. Namely, one set of experimental results was in accordance with the proposed correlation, while the other set deviated from the theoretical results. In particular, the minimum fluidization velocities of the experimental results were greater than the predicted values of the proposed correlation. In view of the differences in the experimental conditions, the observed discrepancies may be attributed to the effects of electrostatic charge and particle shape. In addition, the experimental fluidization defluidization curves were compared to the theoretical results of Jackson's model, and the parameters were fitted to the experimental data. However, Jackson's model is based on a 1D bed; thus, general parameters could not be obtained for a bed with a fixed particle size and thickness due to the two dimensional voidage distribution in the bed and bed cohesion effects, which are a result of electrostatic forces and are not considered in Jackson's model.

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Section: Resultscontrasting

confidence: 48%

Section: Resultsmentioning

confidence: 99%

Section: Wall Effects During the Defluidization Fluidization Processmentioning

confidence: 98%

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On the minimum fluidization velocity in 2D fluidized beds

et al. 2011

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“…The pressure drop across the bed of particles, ∆p bed , is defined as the distributor pressure drop subtracted from the pressure drop of the system when it is filled with particles [19]. Thus,…”

Section: Hydrodynamics Of the Fluidized Bedmentioning

confidence: 99%

Thermal energy storage in a fluidized bed of PCM

Izquierdo-Barrientos

Sobrino

Almendros-Ibáñez

2013

Chemical Engineering Journal

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The objective of the present work was to research the storage behavior of a fluidized bed filled with a granular phase change material (PCM) with a small particle diameter (d p = 0.54 mm). The performance of the fluidized bed was compared to that of well-known storage methods such as fluidized beds with sand and packed beds based of sand and PCM. For this purpose, heating experiments were conducted in a cylindrical bed with air as the working fluid.The influence of the bed height and flow rate on the storage and recovery efficiencies of the fluidized bed of PCM was analyzed. Additionally, the stability of the PCM during various charging-discharging cycles was studied.The results indicate that this PCM is an alternative material that can be used in fluidized bed systems to increase the efficiency of storing thermal * Corresponding author. NOTICE: this is the author's version of a work that was accepted for publication in Chemical Engineering Journal. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. The cycling test shows that the PCM is stable under bubbling conditions up to 15 cycles, which corresponds to approximately 75 hours of continuous operation. A definitive version was subsequently published in Chemical Engineering

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“…Hence, we decided to investigate how the choice of bed depth value affects the numerical prediction of In the literature, the effect of the bed thickness has mainly been studied with respect to the minimum fluidization velocity. It was observed that the latter increases as the bed thickness decreases (Caicedo et al, 2002;Kathuria & Saxena, 1987;Sanchez-Delgado et al, 2011;Saxena & Vadivel, 1988). This is because, as the bed depth reduces, the effect of wall friction becomes more pronounced, limiting the movement of the particles.…”

Section: Dem Simulationsmentioning

confidence: 98%

Lateral solid mixing in gas-fluidized beds: CFD and DEM studies

Oke

Wachem

Mazzei

2016

Chemical Engineering Research and Design

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We investigated lateral solid mixing in gas-fluidized beds using CFD and DEM. We ran 3D CFD simulations, comparing the results with those formerly obtained in 2D CFD simulations. We observed that the frictional stress model affects the numerical results. This was also observed in 2D simulations, but in 3D simulations the effect is less pronounced. The 3D simulations described the lateral solid mixing process more accurately than the 2D simulations, simulation dimensionality being an important factor. To analyse further the role of frictional stress models, we ran 3D DEM simulations, employing the soft-sphere approach to model the particle-particle contact forces. The simulation results agreed reasonably well with the empirical data, but their accuracy depended on the values used for the collision parameters; also, the 3D CFD simulations matched the empirical data more closely.Altogether, we concluded that the simulation dimensionality plays the dominant role in predicting lateral solid mixing accurately.

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A variable-thickness two-dimensional bed for investigating gas—solid fluidized bed hydrodynamics

Cited by 14 publications

References 8 publications

On the minimum fluidization velocity in 2D fluidized beds

On the minimum fluidization velocity in 2D fluidized beds

Thermal energy storage in a fluidized bed of PCM

Lateral solid mixing in gas-fluidized beds: CFD and DEM studies

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