Abstract
AbstractPressure drop for a gas‐solids suspension flowing concurrently downward in a 13‐mm inside‐diameter tube was investigated using 329‐micron spherical glass beads in air. The gas Reynolds number varied from 0 to 30,000 with solids‐loading ratios of up to 20 at a gas Reynolds number of 10,000. The frictional pressure drop for downflow was found to be a weaker function of the solids‐loading ratio than the upflow case using data reported in the literature. Empirical correlation of the two‐phase friction factor, in terms of the gas Reynolds number and a dimensionless parameter, CDEPD/[(1 – Ep)dp], showed that at high solids loadings, particles tend to stabilize the suspension flow. The dimensionless parameter seems to be applicable to a universal pressure drop correlation for solids‐fluid systems, but requires further investigation.
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