The pressure drops associated with the suspension velocities for single, hydrodynamically suspended spheres were measured for a range of steel spheres in a 5.3 cm diameter vertical glass tube. Nineteen different sphere to tube diameter ratios (d/D) were investigated ranging from 0.191 to 0.967. Three different liquid media were used: pure water, and two polyacrylamide solutions of concentration 25 wppm and 50 wppm of Reten 423. In the range 0 < (d/D) < 0.7 polymer addition increased the drag coefficient. For d/D > 0.7 the drag coefficient was not affected. The available data for air, water and polymer solution were correlated with an equation explicit in pressure drop, and the agreement between theory and experiment was found to be excellent.
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Latto et al. (1973) studied this question.
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