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Application of Mechanical Similarity Laws to the Collection Efficiencies of Geometrically Types of Uni-Flow Cyclone Dust Collectors
Author(s): 
Pages: 87-97
Year: Issue:  2
Journal: Journal of Thermal Science

Keyword:  vortex flowturbulent diffusionturbulent mixingcyclone dust collectorcollection efficiencymechanical similarity lawfuchs theory;
Abstract: <正> From the mechanical similarity point of view, the centrifugal effect, Ar, and the Stokes number, St, as well as the Reynolds number, Rec for the motion of solid particles in the cyclone are the relevant parameters. In order to apply these similarity laws for the prediction of the characteristics of the collection efficiency, ηc, geometrically similar types of uni-flow cyclones were used. The body diameters of the cyclones were D1=30, 50, 69 and 99 mm, respectively. The feed particle concentration of the fly-ash particles was up to Co = 60g/m3. From the experimental results: (1) the pressure drop, △pc, in the cyclones was a function of not only the Reynods number, Rec, but also the body diameter, D1; (2) the collection efficiency, ηc, did not always increase with decreasing body diameter but there existed an optimal body size; (3) application of the mechanical similarity laws to the collection efficiency was not always sufficient for estimating the collection efficiency, since the feed particle concentration was an additional important factor; (4) a new parameter which was the ratio, Epf, of the apparent separation energy, Wp, of the solid particles to the energy loss, Ec, of the gas flow in the cyclone was introduced for discussing the collection efficiency; (5) Fuchs theory, used to estimate the collection efficiency, was examined. Fuchs theory may be applied for high feed particle concentration.
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