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- W2010592889 abstract "We make time resolved velocity measurements of steel spheres in free fall through liquid using a continuous ultrasound technique. We explore two different ways to induce large changes in drag on the spheres: 1) a small quantity of viscoelastic polymer added to water and 2) altering the surface of the sphere. Low concentration polymer solutions and/or a pattern of grooves in the sphere surface induce an early drag crisis, which may reduce drag by more than 50% compared to smooth spheres in pure water. On the other hand, random surface roughness and/or high concentration polymer solutions reduce drag progressively and suppress the drag crisis. We also present a qualititative argument which ties the drag reduction observed in low concentration polymer solutions to the Weissenberg number and normal stress difference." @default.
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- W2010592889 date "2007-12-01" @default.
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- W2010592889 title "Polymer and surface roughness effects on the drag crisis for falling spheres" @default.
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- W2010592889 doi "https://doi.org/10.1140/epjb/e2008-00018-0" @default.
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