Particle shape effects on dynamic behaviors in a spouted bed: CFD-DEM study

Liu, Xuejiao; Gan, Jieqing; Wang, Zhong; Yu, Aibing

doi:10.1016/j.powtec.2019.07.099

Cited by 55 publications

(18 citation statements)

References 37 publications

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“…The spout diameters were obtained at three different heights, nozzle vicinity, middle point, and the annulus region surface According to this table, the spout diameter increases with increasing the gas mass flow rate and bed height, regardless of the particle shape. A similar trend was reported by Liu et al, [ 20 ] who studied non‐spherical particles with AR < 4. Furthermore, the diameter of the spout is larger in the bed of spherical particles.…”

Section: Resultssupporting

confidence: 88%

“…Orientation is not important for spherical particles, because they are isotropic, while the orientation of the sphero‐cylindrical particles has a great influence on the particle‐fluid interactions and heat and mass transfer. [ 20,31 ] Also, the interlocking of the particles is related to their orientations. In other words, a higher contact area between particles leads to more interlocking of particles.…”

Section: Resultsmentioning

confidence: 99%

“…They used the multi‐sphere method for representing particles and found that, with increasing the gas velocity and particle density, the Lacey mixing index exhibits an increasing‐decreasing trend. Liu et al [ 20 ] studied the effect of particle shape on the spouting properties of a spouted fluidized bed. They examined seven different shapes of particles varying from disk to cylinder with aspect ratios (ARs) ranged from 0.25–3 and investigated the particle velocity, spout diameter, fountain height, and orientation, as well as the coordination number.…”

Section: Introductionmentioning

confidence: 99%

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CFD‐DEM analysis of the spouted fluidized bed with non‐spherical particles

et al. 2021

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Hydrodynamics of spouted fluidized beds of spherical and elongated sphero‐cylindrical particles with an aspect ratio (AR) of 4 were studied by the CFD‐DEM technique. The multi‐sphere method was adopted to present the sphero‐cylindrical particles. Simulations were validated with the experimental data for both particle types. Bubble equivalent diameter, bubble shape factor, and leakage fraction were obtained in the simulations. Time‐averaged particle velocity and porosity profiles, solids circulation rate, particle exchange distribution at the spout‐annulus interface, were investigated in the beds filled with spherical and sphero‐cylindrical particles at gas mass flow rates of 0.005, 0.007, and 0.009 kg/s. The equivalent bubble diameter was found to be lower for spherical particles compared to sphero‐cylindrical particles. The leakage fraction of the bubble was lower for sphero‐cylindrical particles. Solid circulation rate and spout diameter were larger for the bed of spherical particles. A higher probability of particles transition into the spout was observed for spherical particles. Investigating the orientation showed that sphero‐cylindrical particles tend to orient almost vertically against the gas flow in the spout region, which lowers the exerted drag force, whereas the particles align nearly horizontally in the annulus region. The results revealed that the CFD‐DEM approach is a promising method for investigating the fluid and both spherical and non‐spherical particle behaviours in spouted fluidized beds.

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Section: Resultssupporting

confidence: 88%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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CFD‐DEM analysis of the spouted fluidized bed with non‐spherical particles

et al. 2021

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“…The pellets shape therefore plays a dominant role and obvious effect on the flow characteristics. Similar results, but in the context of pneumatic conveying, were obtained in a study by Liu 38 , where particles of different length-to-diameter ratios were compared. Particles in the ratio equal to one always behaved differently from other particles.…”

Section: Resultssupporting

confidence: 77%

Wood pellets transport with vibrating conveyor: experimental for DEM simulations analysis

Gelnar

Prokeš

Jezerská

et al. 2021

Sci Rep

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This work presents a comprehensive overview of the mechanical-physical parameters of the transport material affecting the vibratory transport. For this purpose, spruce pellets of different lengths, oak rods and spruce crush were tested. The determined parameters were particle size distribution and shape, internal friction, static and dynamic angle of repose. The samples were transported by a patented validation vibrating conveyor. Various settings were used. The results show that by changing the shape, it is possible to reduce friction or resistance as well as energy intensity during transport. It was observed that perfect shapes and lighter particles have lower friction, but a more pronounced bounce. Therefore, it does not form a typical pattern during transport, as in the case of an imperfectly shaped one. There is also included a simulation of the discrete element method. The study shows the possibility of the vibration machine where the material can be conveyed either directionally or sorted.

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“…Em seu estudo, os dados obtidos através da técnica CFD-DEM foram utilizados como dados de referência nas comparações entre CFD e DDPM. de rolamento partícula-partícula dificultam o movimento translacional das partículas e afetam principalmente a transferência de calor por condução, quando comparada à por convecção.Marchelli et al (2020a) estudaram a adequação de diferentes modelos de arraste para diferentes velocidades de alimentação de leito de jorro variando entre 1u oms e 2u oms e observaram que o Modelo de arraste de Gidaspow foi o único modelo eficaz na predição da fluidização de partículas, para toda a faixa de velocidades estudada.A influência do formato da partícula na velocidade de circulação de sólidos e na taxa de circulação foi estudada porLiu et al (2020). Os autores concluíram que para partículas esféricas é observada maior força de arraste e velocidades de partículas mais altas, quando comparadas às partículas cilíndricas.Marchelli et al (2020b) analisaram o tempo de residência de partículas no interior de um leito de jorro de base quadrangular contendo partículas de polietileno.…”

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Estudo CFD-DEM de um leito de jorro operando nos regimes denso, de transição e jet spouted bed

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A Deus, por me dar as mãos e trilhar comigo o caminho até aqui. Aos meus pais, Antonia e Elizeu (in memorian), minha eterna gratidão por não medirem esforços para que eu atinja todos os meus objetivos. Aos meus irmãos Adriana, Ricardo e Rita e cunhados Fábio Júnior, Luciano e Míriam, por todo o carinho e incentivo. Aos meus sobrinhos Antonio, Bruno, Francisco, Laura, Miguel e Ricardo Júnior, pelos momentos alegres a cada reunião familiar, em Campos Altos. Ao meu marido Henrique, por todo o apoio, amor e carinho, essenciais para que eu pudesse viver a pesquisa com a tranquilidade e dedicação necessárias. Obrigada por me incentivar a perseguir meus sonhos. Essa conquista é nossa! Aos Orientadores Marcos Antonio de Souza Barrozo e Claudio Roberto Duarte, por toda a paciência e ensinamentos, que contribuíram tão fortemente para meu crescimento profissional e pessoal. Ao Marquinhos, meu agradecimento especial por ter confiado a mim este tema de pesquisa e me incentivado a persistir no propósito deste estudo, a cada desafio encontrado. À Professora Kássia, do DEQ/UFTM, por ter me apresentado à pesquisa científica, ainda na graduação. Sem seus ensinamentos e amizade não teria sido possível chegar até aqui, serei eternamente grata.

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Particle shape effects on dynamic behaviors in a spouted bed: CFD-DEM study

Cited by 55 publications

References 37 publications

CFD‐DEM analysis of the spouted fluidized bed with non‐spherical particles

CFD‐DEM analysis of the spouted fluidized bed with non‐spherical particles

Wood pellets transport with vibrating conveyor: experimental for DEM simulations analysis

Estudo CFD-DEM de um leito de jorro operando nos regimes denso, de transição e jet spouted bed

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