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A damping phenomenon in viscoelastic fluids

Abstract : Flow fields behind a sphere settling in polymeric fluids are investigated using a Particle Image Velocimetry (PIV) technique. Complex features including both a negative wake and a surrounding cone are quantified. In particular, an oscillation zone, which takes place behind the negative wake, is identified for the first time. A physical understanding of various phenomena involved in the wake is gained. The damping phenomenon can be attributed to the viscoelastic properties and the surrounding cone stems from a propagation front of lateral viscoelastic wave emitted by the settling sphere. The oscillation frequency and open angle of the surrounding cone are theoretically related to a viscoelastic Mach number. Satisfactory agreement with experiments is observed.
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Submitted on : Thursday, February 4, 2016 - 11:18:17 PM
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Xavier Frank, N. Dietrich, Huai-Zhi Li. A damping phenomenon in viscoelastic fluids. EPL - Europhysics Letters, European Physical Society/EDP Sciences/Società Italiana di Fisica/IOP Publishing, 2014, 105 (5), 6 p. ⟨10.1209/0295-5075/105/54006⟩. ⟨hal-01268559⟩



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