Motion and clustering of bonded particles in narrow solid-liquid fluidized beds

Autor(es)

Cunez, Fernando David ^[1] ; Lima, Nicolao Cerqueira ^[1] ; Franklin, Erick M. ^[1]

Afiliação do(s) autor(es)

^[1] UNICAMP Univ Campinas, Sch Mech Engn, Rua Mendeleyev 200, Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Physics of Fluids; v. 33, n. 2 FEB 1 2021.
• Citações Web of Science: 0

Resumo

This paper presents an experimental and numerical investigation of solid-liquid fluidized beds consisting of bonded spheres in very narrow tubes, i.e., when the ratio between the tube and grain diameters is small. In narrow beds, high confinement effects have proved to induce crystallization, jamming, and different patterns, which can be intensified or modified if some grains are bonded together. In order to investigate that, we produced duos and trios of bonded aluminum spheres with a diameter of 4.8mm and formed beds consisting either of 150-300 duos or 100-200 trios in a 25.4 mm-ID pipe, which were submitted to water velocities above those necessary for fluidization. For the experiments, we filmed the bed with high-speed and conventional cameras and processed the images, obtaining measurements at both the bed and grain scales. For the numerical part, we computed the bed evolution for the same conditions with a computational fluid dynamics-discrete element method code. Our results show distinct motions for individual duos and trios and different structures within the bed. We also found that jamming may occur suddenly for trios, where even the microscopic motion (fluctuation at the grain scale) stops, calling into question the fluidization conditions for those cases. (AU)

• Processo FAPESP: 18/23838-3 - Leito móvel e arrastamento do tipo creep de um leito granular bidisperso em um escoamento laminar
• Beneficiário: Fernando David Cúñez Benalcázar
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado
• Processo FAPESP: 16/18189-0 - Leito fluidizado em meio líquido em tubos finos: dinâmica e instabilidades
• Beneficiário: Fernando David Cúñez Benalcázar
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 19/20888-2 - Simulações CFD-DEM em leitos fluidizados
• Beneficiário: Nicolao Cerqueira Lima
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 18/14981-7 - Modelagem de escoamentos granulares densos: experimentos, simulações numéricas e análises de estabilidade
• Beneficiário: Erick de Moraes Franklin
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores - Fase 2