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High viscosity gas fluidization of fine particles: An extended window of quasihomogeneous flow

 

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Author: Valverde Millán, José Manuel
Castellanos Mata, Antonio
Department: Universidad de Sevilla. Departamento de Electrónica y Electromagnetismo
Date: 2006
Published in: Physical review. E, Statistical, nonlinear and soft matter physics, 74, 2, 021302-1-021302-6
Document type: Article
Abstract: 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.
Cite: 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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URI: http://hdl.handle.net/11441/26890

DOI: 10.1103/PhysRevE.74.021302

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