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A fractal approach is adopted to describe the dynamic behavior of a circulating fluidized bed. Two time series, differential pressure fluctuations along the riser height and solids momentum fluctuations along the radial direction, are measured and analyzed in terms of fractal dimensions. The influences of operating conditions and axial/radial positions on the fractal dimension are discussed. Attempts...
A simple momentum probe was used to distinguish between upward and downward flow regions in risers with diameters of 66, 97 and 150 mm. Experiments indicated that a typical core-annulus flow structure existed only above the inflection point corresponding to the axial voidage profile. In the lower dense region, due to extensive solids turbulence and mixing, no clear core-annulus flow structure was...
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