Secondary flow in the neighborhood of a cylinder oscillating in a viscoelastic fluid |
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Authors: | Ching-Feng Chang W.r. Schowalter |
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Affiliation: | Department of Chemical Engineering, Princeton University, Princeton, New Jersey 08540 U.S.A. |
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Abstract: | Measurements were made of the steady secondary flow which is caused by a cylinder executing small-amplitude oscillations perpendicular to the cylinder generators. Test fluids were a water-glycerine mixture and two non-Newtonian fluids: aqueous solutions of Separan AP-30 and PolyHall 295 polyacrylamide polymers. The fluids were contained in a cylinder whose center coincides with the rest position of the oscillating cylinder. Experimental results are consistent with a theoretical analysis for a three-constant Oldroyd fluid model in its simplified convected-Maxwell form. Both experiment and theory show that at an oscillation frequency of 40 Hz the secondary flow of the dilute polymer solutions is, essentially, in a sense opposite from that of a Newtonian fluid. |
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