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Pneumatic transport of Group C 20 μm glass beads was studied in a 31.7 mm vertical line, along with 66 μm Group A glass beads for comparison. Pressure gradients along the riser were measured and the Zenz type state diagrams were constructed for both type of particle. For Group C particles, the results show that the Zenz diagram has the usual characteristic form, but the minimum pressure gradient is...
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