Stability of slot‐rectangular spouted beds with multiple slots

Chen, Zhiwei; Lim, C. J.; Grace, John R.

doi:10.1002/cjce.21919

Cited by 16 publications

(6 citation statements)

References 20 publications

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“…Chen et al [246] simulated a multiple spout fluidised bed assessing the effect of baffles, which divide the bed in three parts. They showed the effect was different depending on the number of gas inlet used: positive in case of double and triple spouting and negative in case of single spouting; moreover, in case of multiple spouting, the fountains may disturb each other creating more difficulties in the development of a stable regime.…”

Section: Tfm Applied To Auxiliary Devicesmentioning

confidence: 99%

Modelling of Spouted and Spout-Fluid Beds: Key for Their Successful Scale Up

et al. 2017

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The development of robust mathematical models could provide the necessary tools for a more rapid, efficient, and reliable spouted bed technology development. Computer simulations can be very useful to aid this design and scale-up process: firstly, they can contribute to obtain a fundamental insight into their complex dynamic behavior by understanding the elementary physical principles such as drag, friction, dissipation etc.; secondly, the simulations can be used as a design tool where the ultimate goal is to have a numerical model with predictive capabilities for gas-particle flows at engineering scale. Clearly, one single simulation method will not be able to achieve this goal, but a hierarchy of methods modelling phenomena on different length and time scales can achieve this. The most fruitful approach will be when they are simultaneously followed, so that they can mutually benefit from each other. In this sense, this paper presents a review of the current state of the art of modelling on spouted and spout-fluid beds through an analysis of recent literature following a multiscale approach (molecular and particle, lab, plant and industrial scale). The main features of the different scales together with their current limits are discussed and specific topics are highlighted as paths that still need to be explored. In summary, the paper aims to define the theoretical setline and the basis of improvement that would lead to a robust multiscale model with solid links between micro and macroscopic phenomena. If done with the correct balance between accuracy and computational costs it will gear SB towards their reliable and successful implementation.

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Section: Tfm Applied To Auxiliary Devicesmentioning

confidence: 99%

Modelling of Spouted and Spout-Fluid Beds: Key for Their Successful Scale Up

et al. 2017

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“…In addition, they noted an increase of 3D effects when the bed height or the column thickness increased. Chen et al [20] investigated the effect of multiple spouting in rectangular spouted beds and concluded that scale-up could be obtained with rectangular chambers separated by suspended partition baffles.…”

Section: -Introductionmentioning

confidence: 99%

Hydrodynamic investigation of gas-solid flow in rectangular spout-fluid bed using CFD-DEM modeling

et al. 2015

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“…Moreover, the evolution of pressure drop and its fluctuation has long been regarded as an indicator for the spouting quality. 23 Pietsch et al 24 analyzed the spouting stability by time-dependent pressure drop behavior and investigated the effect of the draft plate on the alternating deflection of the spout in the lateral direction. However, due to the intrinsic defects of the detection methods, these studies can only provide a general judgment about whether the spout deflection happens and cannot offer the fundamental understanding of the spout deflection.…”

Section: Introductionmentioning

confidence: 99%

“…Zhong and Zhang built a relationship between the flow pattern and entropy of the pressure drop. Moreover, the evolution of pressure drop and its fluctuation has long been regarded as an indicator for the spouting quality . Pietsch et al analyzed the spouting stability by time-dependent pressure drop behavior and investigated the effect of the draft plate on the alternating deflection of the spout in the lateral direction.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Spout Deflection in a Rectangular Spouted Bed by the PIV Method

Yue

Wang

Bahl

et al. 2020

Ind. Eng. Chem. Res.

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Spout deflection is a common instability phenomenon, which has been widely encountered in spouted and spout-fluidized beds. However, the spout deflection has not been quantified experimentally. In the present work, the alternating spout deflection behavior is captured by employing the particle image velocimetry (PIV) method and quantified based on PIV vector fields over a wide range of variables in terms of bed heights and spouting velocities. The results show that the static bed height has an obvious effect on the alternating spout deflection. The amplitude of the alternating spout deflection keeps stable at first and then reduces quickly with increasing static bed height. The drop tendency is ascribed to the appearance of spout incoherence behavior in which the particle blockage periodically forms and explodes in the spout region. This explosion contributes to uniform particle spurting and reduces the height difference between two annulus regions and the spout deflection amplitude. The amplitude of the alternating spout deflection is stable with increasing spouting velocity, which can be owed to the self-locking phenomenon. Specifically, the particles in the annulus region on one side cannot be transported away due to the resistance of the deflected spout and thereby preventing the further deflection of the spout. Spouting velocity has a neglectable influence on the regularity and main frequency of the alternating spout deflection. This work unveils the hydrodynamics of spout deflection and provides a methodology for experimental investigation of spout deflection in spouted beds.

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Stability of slot‐rectangular spouted beds with multiple slots

Cited by 16 publications

References 20 publications

Modelling of Spouted and Spout-Fluid Beds: Key for Their Successful Scale Up

Modelling of Spouted and Spout-Fluid Beds: Key for Their Successful Scale Up

Hydrodynamic investigation of gas-solid flow in rectangular spout-fluid bed using CFD-DEM modeling

Experimental Investigation of Spout Deflection in a Rectangular Spouted Bed by the PIV Method

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