Artículo
High viscosity gas fluidization of fine particles: An extended window of quasihomogeneous flow
Autor/es | Valverde Millán, José Manuel
Castellanos Mata, Antonio |
Departamento | Universidad de Sevilla. Departamento de Electrónica y Electromagnetismo |
Fecha de publicación | 2006 |
Fecha de depósito | 2015-07-15 |
Publicado en |
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Resumen | We explore the role of gas viscosity in the behavior of gas-fluidized beds of fine powders by means of experimental measurements using nitrogen and neon as fluidizing gases, and theoretical considerations. The existence ... We explore the role of gas viscosity in the behavior of gas-fluidized beds of fine powders by means of experimental measurements using nitrogen and neon as fluidizing gases, and theoretical considerations. The existence of a nonbubbling fluidlike regime has been recently observed in beds of fine powders fluidized with nitrogen. Our experiments with neon reveal a discontinuous transition from heterogeneous fluidization to a highly expanded homogeneous fluidization state. We point out that increasing gas viscosity enhances the coherence of agglomerate swarms, which promotes a local void-splitting mechanism, thus improving the uniformity of fluidization. Our theoretical analysis predicts that further increase of gas viscosity would produce a full suppression of the bubbling regime, i.e., the uniformly fluidized bed would undergo a direct transition to a turbulent regime as seen in beds of nanoparticles fluidized by nitrogen and in liquid-fluidized beds of moderate-density beads. |
Cita | Valverde Millán, J.M. y Castellanos Mata, A. (2006). High viscosity gas fluidization of fine particles: An extended window of quasihomogeneous flow. Physical review. E, 74 (2), 021302-1-021302-6. |
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