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Effect of vibration on the stability of a gas-fluidized bed of fine powder

Opened Access Effect of vibration on the stability of a gas-fluidized bed of fine powder

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Autor: Valverde Millán, José Manuel
Castellanos Mata, Antonio
Sánchez Quintanilla, Miguel Angel
Departamento: Universidad de Sevilla. Departamento de Electrónica y Electromagnetismo
Fecha: 2001
Publicado en: Physical review E. Statistical, nonlinear, and soft matter physics, 64, 2, 021302-1-021302-8
Tipo de documento: Artículo
Resumen: We have investigated the effect of vibrations on the stability of gas-fluidized beds of fine powders (particle size ~10 mm). The powder is uniformly fluidized by an adjustable gas flow that enables us to control the average solid volume fraction f0. The fluidized bed is then subjected to a vertical oscillatory motion of controlled amplitude and frequency. The response of the fluidized bed depends essentially on the value of f0. For f0.0.28 the fluidized bed is in a weak solidlike regime, it has a mechanical strength, and particles are static. In this regime vibration causes compaction of the loosely packed bed. For f0,0.28 the mechanical strength vanishes and stresses are carried by interstitial gas and collisions. In this fluidlike regime the fluidized bed displays a diffusive dynamics and particles aggregate due to the strong interparticle van der Waals forces. When vibration is applied the powder expands due to the partial disruption of aggregates. However at a critical value of ...
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Tamaño: 164.9Kb
Formato: PDF

URI: http://hdl.handle.net/11441/26901

DOI: 10.1103/PhysRevE.64.021302

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