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Experiments have been performed to investigate the sporadic motion of cubic and rectangular prism particles at the threshold of hydraulic conveying in a pipe inclined at various angles. The particle spends periods of time at rest at the invert of the pipe before moving variable distances downstream; the process then repeats. It is shown that successive time periods of rest auto-correlate, meaning...
This work presents experimental results on pickup velocity (critical velocity) measurements for a variety of particulate solids. The present experiments together with previously published experiments of a number of researchers encompass about 100 measurements of 24 materials for a wide range of particle sizes, shapes and densities. Based on the experimental results, three zones are defined by establishing...
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