Drag coefficients of spheres falling in dilute aqueous solutions of long-chain macromolecules
Hayes, Michael F.
Sanders, James V.
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The drag coefficients of spheres falling dilute aqueous solutions of long-chain macromolecules were investigated over a range of Reynolds numbers based on the viscosity of water from 800 to 7 X 10 . Solutions used had polymer concentrations of 100 to 1000 weight parts per million of three grades of Polyethylene Oxide, WSR-35, WSR-205 and WSR-N-3000, and concentrations of 10 to 1000 weight parts per million of WSR-301. Reductions in drag were observed in only the solutions of the two higher molecular weight polymers, and then only at Reynolds' numbers greater than 10 . For all concentrations of WSR-301, the drag decreased with increasing Reynolds' numbers and for a given Reynolds' number the drag was minimized at a concentration of 100 wppm.
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