Abstract
A new theoretical model for predicting particle separation efficiency in bends is developed based on the investigation of flow pattern, the critical particle size separation theory and the boundary layer separation theory. The radial particle concentration gradient, instead of the usually assumed uniform radial particle concentration within the bends, is considered in this mathematical model. The local particle concentration and the separation efficiency can be calculated on the base of a time-of-flight model in terms of the particle size distribution of the feed. The effects of curvature ratio and bend angle on the separation efficiency in bends are also evaluated by the model.
Highlights
Bends are widely used in the field of air pollution control and gas-solid separation for aerosol sampling and industrial applications
Cheng and Wang [3] developed a model for the impaction efficiency of aerosol particles in 90o bends, this model was based on an analytical laminar flow solution and gave the separation efficiency as a function of the Stokes number and curvature ratio
Pui et al [6] experimentally evaluated the separation of particle in 90o bends, for turbulent flow, they suggested that the separation efficiency does not depend on either curvature ratio or Reynolds number but only Stokes number, and offered a correlation for evaluated the particle separation efficiency
Summary
Bends are widely used in the field of air pollution control and gas-solid separation for aerosol sampling and industrial applications. Cheng and Wang [3] developed a model for the impaction efficiency of aerosol particles in 90o bends, this model was based on an analytical laminar flow solution and gave the separation efficiency as a function of the Stokes number and curvature ratio. Cheng and Wang [5] re-examined the separation of particles in the bends, they conclude that in the laminar flow regime, the particle separation was mainly a functions of Stokes number and flow Reynolds number (Re) for curvature ratio between 4 to 20.
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