Abstract
An experimental study is carried out for a swirling flow pneumatic conveying system in a vertical pipeline in terms of the overall pressure drop and solid flow patterns. The test section consists of a pipeline 12 m in height with an inside diameter of 80mm. Measurements were made for three initial swirl numbers from 0.58 to 1.12, the average gas velocities from 9 to 23 m/s and the solid-gas ratios from 1.5 to 23. Polystyrene, polyethylene and polyvinyl pellets with mean diameters of 1.7, 3.1 and 4.3 mm, respectively, were transported as test particles. It is found that in lower gas velocity range, the overall pressure drop for swirling flow pneumatic conveying was close to that for axial flow pneumatic conveying and that wall static pressure of the former was lower than that of the latter.
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