Pressure drop and pressure fluctuations in spouted beds with binary mixtures of particles

Du, Wei; Zhang, Lifeng; Zhang, Bo; Bao, Shuhui; Xu, Jian; Wei, Weisheng

doi:10.1016/j.powtec.2015.02.016

Cited by 18 publications

(5 citation statements)

References 40 publications

(45 reference statements)

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“…Many experimental and computational works on the hydrodynamics and flow field of gas-solid spouted beds, in general, have been reported [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38]. The reported studies used various techniques, such as direct visualization, pressure measurements and various probes to measure global dynamic parameters (e.g., spout diameter, spout shape, spoutable height, fountain height, etc.).…”

Section: Introductionmentioning

confidence: 99%

Investigation of cross-sectional gas-solid distributions in spouted beds using advanced non-invasive gamma-ray computed tomography (CT)

Al-Juwaya

Ali

Al‐Dahhan

2017

Experimental Thermal and Fluid Science

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The successful operation and safety of the Very-High-Temperature Nuclear Reactors (VHTR) extremely depend on the quality of the TRISO nuclear fuel coated particles. Hence, the fuel coating technology of TRISO particles, based on chemical vapour deposition (CVD) process, performed in gas-solid spouted beds, is of utmost importance. However, the deposition of the coating layers surrounding the kernel is a delicate process, and impacted by the hydrodynamics of spouted beds. Therefore, in this work, we have applied an advanced non-invasive gamma-ray computed tomography (CT) technique for the first time to investigate the hydrodynamics of spouted beds. In particular, we study the effect of particle density, particle size, bed size, and superficial gas velocity on the gas-solid cross-sectional distributions of spouted beds. The color distributions of the cross-sectional images clearly identified the three regions of spouted beds: the spout, the annulus, and the fountain regions. Interesting results and findings are presented, discussed and analyzed in the article. For example, the results demonstrated that the summation that operating spouted beds at stable spouting state would lead to achieving uniform coating layers of the particles in the TRISO fuel coating process is not adequate. Further, it has been found that increasing the superficial gas velocity much higher above the minimum spouting velocity increases the gas holdup in the annulus above the gas holdup value at the loss-packed bed state, contrary to common assumptions presented in the literature. This study represents an original experimental investigation required both for advancing the understanding of TRISO particles spouted bed and providing benchmark data to validate computational fluid dynamics (CFD).

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Section: Introductionmentioning

confidence: 99%

Investigation of cross-sectional gas-solid distributions in spouted beds using advanced non-invasive gamma-ray computed tomography (CT)

Al-Juwaya

Ali

Al‐Dahhan

2017

Experimental Thermal and Fluid Science

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“…14−16 The peak pressure drop in a binary particle system is a function of interparticle forces between coarser and fine particles. 17 Kumar and Vinod 18 studied the bed expansion ratio as a function of gas velocity, particle size, and solid mass loading and concluded that an increase in bed mass results in a decrease in the bed expansion ratio. The transient hydrodynamics of a spouted bed with polydispersed particles (Geldart-D type) has been investigated experimentally by Bai et al 19 The authors reported the dependence of the minimum spouting velocity on the bed height.…”

Section: ■ Introductionmentioning

confidence: 99%

“…A large number of studies on the prediction of minimum spouting velocity using the pressure–velocity characteristic curve for a binary mixture of solids with a difference in size and density are reported in the literature. − The peak pressure drop in a binary particle system is a function of interparticle forces between coarser and fine particles . Kumar and Vinod studied the bed expansion ratio as a function of gas velocity, particle size, and solid mass loading and concluded that an increase in bed mass results in a decrease in the bed expansion ratio.…”

Section: Introductionmentioning

confidence: 99%

Computational Fluid Dynamics–Discrete Element Method Studies on Dynamics and Segregation in Spouted Bed with Polydispersed Particles

Raman

Mollick

Goswami

2022

Ind. Eng. Chem. Res.

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The computational fluid dynamics−discrete element method (CFD−DEM) technique has been used to investigate the translational and rotational dynamics of polydispersed particles in a pseudo-two-dimensional spouted bed. Minimum spouting velocity is predicted numerically and compared with the experimental measurements. The mean particle-phase translational and angular velocities have been computed and compared for finer and coarser particles. The dynamics of the polydispersed particles have been compared with monosize particles having an equivalent Sauter mean diameter. In the polydispersed bed, particles with lower diameters spread up to the wall of the spout setup, leading to a reduction in a particle-free zone away from the core. Segregation of the finer and the coarser particles has been assessed for different superficial gas velocities. The bigger particles are concentrated in the central part of the bed, and their concentration decreases laterally from the spout to the annulus region. An increased concentration of finer particles is observed near the wall. The extent of near-wall segregation decreases with an increase in gas velocity.

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“…In the past [4], the spouted bed was designed to treat coarse particles (size greater than 1 mm) or mixtures of particles of different size and/or density [1,5,6,7]. This technology has been distinguished from the fluidized bed not only by its peculiar particle circulation, but also by its lower pressure drop and better contact between the two phases due to the counter-current movement of the solid (upwards in the spout and downwards in the annulus).…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, it is not possible to operate stably with fine particles. Several authors managed to attain stable operation with fine particles [7,11,12,13,14,15], but in all cases they used low values of the mentioned ratio or stabilized the system with internal tubes.…”

Section: Introductionmentioning

confidence: 99%

Minimum spouting velocity of fine particles in fountain confined conical spouted beds

et al. 2020

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Pressure drop and pressure fluctuations in spouted beds with binary mixtures of particles

Cited by 18 publications

References 40 publications

Investigation of cross-sectional gas-solid distributions in spouted beds using advanced non-invasive gamma-ray computed tomography (CT)

Investigation of cross-sectional gas-solid distributions in spouted beds using advanced non-invasive gamma-ray computed tomography (CT)

Computational Fluid Dynamics–Discrete Element Method Studies on Dynamics and Segregation in Spouted Bed with Polydispersed Particles

Minimum spouting velocity of fine particles in fountain confined conical spouted beds

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