Minimum fluidization velocity in gas‐liquid‐solid minifluidized beds

Li, Yanjun; Liu, Mingyan; Li, Xiangnan

doi:10.1002/aic.15196

Cited by 19 publications

(7 citation statements)

References 39 publications

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“…Visual observation and hydrostatic pressure drop analysis of the multiphase flow are frequently used to estimate U Lmf . Additionally, U Lmf L.s is calculated by mathematical, fractal, disorder, wavelet, and neural network analyses [32]. The Ergun equation (Ergun [46]) is the generally known model for determining a fluid's minimum fluidization velocity to fluidize the particle [47].…”

Section: Minimum Fluidization Velocity (U Lmf )mentioning

confidence: 99%

“…Many articles have been reported on the minimum velocity of fluidized beds in three phases (Begovich and Watson, [3]; Fortin, [48]; Costa et al, [49]; Song et al, [50]; Nacef et al, [51]; Zhang et al, [52]; Ramesh et al, [53]; Ruiz et al, [54]; Sivasubramanian et al [34]; Jena et al, [2] and Li et al, [32]). Many studies of the minimum fluidization velocity in three-phase fluidized beds are limited to air-water glass bead systems whose particle density exceeds that of the liquid by a factor of 2 to 3 [25].…”

Section: Minimum Fluidization Velocity (U Lmf )mentioning

confidence: 99%

“…The design of commercial reactors could confidently use these correlations. Li et al [32] have been experimentally investigated that U Lmf cannot be calculated in 3-5 mm MFBs. Both data analyses of the pressure drop and Hurst exponent can be used to verify U Lmf for 8-10 mm MFBs with low surface gas velocity.…”

Section: Minimum Fluidization Velocity (U Lmf )mentioning

confidence: 99%

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Recent Development in Hydrodynamic and Heat Transfer Characteristics in the Three-phase Fluidized-bed System

Mahdy¹,

Abdulrahmn²,

Ali³

2022

ETJ

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The effect of several characteristics on hydrodynamic performance and heat transfer phenomena has been studied extensively.  A review of most of the previous correlations for various parameters in gas-liquid-solid fluidization systems was investigated. CFD could be used to understand the complicated hydrodynamics of fluidization Gas-liquid-solid fluidized beds are broadly utilized in the petrochemical, pharmaceutical, refining, food, biotechnology, and environmental industries. Due to complex phenomena, such as the particle-particle, liquid-particle, particlebubble interactions, complex hydrodynamics, and heat transfer of three-phase (gas-liquid-solid) fluidized beds, they are incompletely understood. The ability to accurately predict the essential characteristics of the fluidized-bed system, such as hydrodynamics, individual phase mixing, and heat transfer parameters, is necessary for its successful design and operation. This paper investigates the pressure drop, minimum fluidization velocity, phase holdup, heat-transfer coefficient of a fluidized bed reactor, heat transfer studies, CFD simulation, and the effect of these parameters on the extent of fluidization. Many variables (fluid flow rate, particle density and size, fluid inlet, and bed height) affect the fluidizing quality and performance of the fluidization process. The hydrodynamics parameters, mixing of phases, and the behavior of heat transfer with various modes of fluidization were investigated to predict hydrodynamics parameters. Several publications have demonstrated the utility of (CFD) in explaining the hydrodynamics, heat, and mass transfer of fluidized beds. Principles of measurement, details of the experimental configurations, and the applied techniques by various researchers are also presented. Feng's model was statistically validated using experimental data that was both time-averaged and time-dependent. Furthermore, this model successfully predicted the instantaneous flow structures, which should provide strategies for the best design, scale-up, and operation in fluidized bed columns. The divergence between the simulated and observed values can be reduced by better understanding the fluidized bed's nature.

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Section: Minimum Fluidization Velocity (U Lmf )mentioning

confidence: 99%

Section: Minimum Fluidization Velocity (U Lmf )mentioning

confidence: 99%

See 1 more Smart Citation

Recent Development in Hydrodynamic and Heat Transfer Characteristics in the Three-phase Fluidized-bed System

Mahdy¹,

Abdulrahmn²,

Ali³

2022

ETJ

View full text Add to dashboard Cite

show abstract

“…Microreactors produced by micromachining technology outperform conventional macroscale counterpart installations in terms of heat and mass transfer, and thus they can achieve a higher efficiency of production. In addition, the low cost, safe as well as controllable operation, and easy accident handling are also the unique advantages of these microscale devices. , In view of this, microfluidized beds with the inner diameter or cross-section side length in the millimeter , or even submillimeter order emerge as a novel type of process-intensified reactor that combines the advantages of microtechnology systems and fluidized beds. They hold significant potential for application in the field of process industries and have been gaining increasing attention.…”

Section: Introductionmentioning

confidence: 99%

Multibubble Behavior and Solid Circulation Rate in a Gas–Liquid–Solid Circulating Microfluidized Bed

Guo,

Ma,

Liu

et al. 2023

Ind. Eng. Chem. Res.

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Comprehensively understanding the hydrodynamics of microfluidized beds is advantageous for guiding their application in chemical and related process industries. This paper investigated the flow regime transition, multibubble behavior, and solid circulation rate of a three-phase circulating microfluidized bed with an inner diameter of 0.8 mm. Experimental results showed that increasing the gas velocity significantly facilitated the transition to the circulating fluidization regime. Transitions between different flow regimes could be delayed by enhanced wall effects. The bubble diameter ranged from 0.1 to 0.5 mm and followed a log-normal distribution. The bubble velocity could be affected by wall effects, particles, bubble coalescence, and bubble spacing. The average bubble velocity was related to the flow regime and decreased in the axial direction. The solid circulation rate, expressed in terms of mass flow rate, was determined using the image mean gray value method in combination with the PIVlab, with a deviation from measurements obtained using traditional methods of less than 10%.

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“…Among the researches on the mini-scale multiphase flow systems, there have been some reports on the micro-or mini-scale fluidized beds. The main topics are to determine the hydrodynamic parameters of the mini-fluidized bed, such as flow regime, minimum fluidization velocity, minimum bubble velocity, bubble size, bubble terminal velocity, and so on, [16][17][18][19][20][21][22][23][24][25] by means of pressure drop measurement and high-speed photography. Compared with conventional fluidized beds, it is found that some factors negligible in macro flow play a major role in mini-flow systems, such as flow regime transitions influenced by the ratio of bed to particle diameter, which can be attributed to local heterogeneous fluidization caused by wall effect.…”

mentioning

confidence: 99%

Characteristics of flow fields in the gas–liquid mini‐bubble columns with particle image velocimetry measurements

Liu

et al. 2022

AIChE Journal

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As a new type of gas-liquid microreactors, the gas-liquid mini-bubble column has potential applications. However, few studies on the flow fields in the mini-bubble column can be found at present. In this work, particle image velocimetry (PIV) was used to visually study the velocity fields, vorticity fields and bubble dynamics in the gas-liquid mini-bubble columns with column inner diameters of 1-3 mm and minibubble diameters ranged from 0.7 to 1.3 mm. It is found that with the increase of superficial liquid velocity, bubbles rose from almost straight line to Z-shaped or S-shaped trajectory, and the bubble trajectory changed from one-dimension to three-dimension; when the bubble velocity changed, the bubble size and gas holdup decreased; bubble terminal velocity was controlled by bubble buoyancy and flow resistance, and increased slightly with bubble coalescence. These findings may provide basic reference for the design and scale-up of such a mini-bubble column reactor.

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Minimum fluidization velocity in gas‐liquid‐solid minifluidized beds

Cited by 19 publications

References 39 publications

Recent Development in Hydrodynamic and Heat Transfer Characteristics in the Three-phase Fluidized-bed System

Recent Development in Hydrodynamic and Heat Transfer Characteristics in the Three-phase Fluidized-bed System

Multibubble Behavior and Solid Circulation Rate in a Gas–Liquid–Solid Circulating Microfluidized Bed

Characteristics of flow fields in the gas–liquid mini‐bubble columns with particle image velocimetry measurements

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