Handle URI:
http://hdl.handle.net/10754/598345
Title:
Fluctuations and Instability in Sedimentation
Authors:
Guazzelli, Élisabeth; Hinch, John
Abstract:
This review concentrates on the fluctuations of the velocities of sedimenting spheres, and on the structural instability of a suspension of settling fibers. For many years, theoretical estimates and numerical simulations predicted the fluctuations of the velocities of spheres to increase with the size of the container, whereas experiments found no such variation. Two ideas have increased our understanding. First, the correlation length of the velocity fluctuations was found experimentally to be 20 interparticle separations. Second, in dilute suspensions, a vertical variation in the concentration due to the spreading of the front with the clear fluid can inhibit the velocity fluctuations. In a very dilute regime, a homogeneous suspension of fibers suffers a spontaneous instability in which fast descending fiber-rich columns are separated by rising fiber-sparse columns. In a semidilute regime, the settling is hindered, more so than for spheres. © 2011 by Annual Reviews. All rights reserved.
Citation:
Guazzelli É, Hinch J (2011) Fluctuations and Instability in Sedimentation. Annual Review of Fluid Mechanics 43: 97–116. Available: http://dx.doi.org/10.1146/annurev-fluid-122109-160736.
Publisher:
Annual Reviews
Journal:
Annual Review of Fluid Mechanics
KAUST Grant Number:
KUK-C1-013-04
Issue Date:
21-Jan-2011
DOI:
10.1146/annurev-fluid-122109-160736
Type:
Article
ISSN:
0066-4189; 1545-4479
Sponsors:
We thank L. Bergougnoux, J.E. Butler, B. Metzger, M. Nicolas, D. Saintillan, and P. Snabre forsupplying data, figures, and movies. While writing this, E.J.H. was partially supported by awardKUK-C1-013-04 made by King Abdullah University of Science and Technology (KAUST).
Appears in Collections:
Publications Acknowledging KAUST Support

Full metadata record

DC FieldValue Language
dc.contributor.authorGuazzelli, Élisabethen
dc.contributor.authorHinch, Johnen
dc.date.accessioned2016-02-25T13:19:05Zen
dc.date.available2016-02-25T13:19:05Zen
dc.date.issued2011-01-21en
dc.identifier.citationGuazzelli É, Hinch J (2011) Fluctuations and Instability in Sedimentation. Annual Review of Fluid Mechanics 43: 97–116. Available: http://dx.doi.org/10.1146/annurev-fluid-122109-160736.en
dc.identifier.issn0066-4189en
dc.identifier.issn1545-4479en
dc.identifier.doi10.1146/annurev-fluid-122109-160736en
dc.identifier.urihttp://hdl.handle.net/10754/598345en
dc.description.abstractThis review concentrates on the fluctuations of the velocities of sedimenting spheres, and on the structural instability of a suspension of settling fibers. For many years, theoretical estimates and numerical simulations predicted the fluctuations of the velocities of spheres to increase with the size of the container, whereas experiments found no such variation. Two ideas have increased our understanding. First, the correlation length of the velocity fluctuations was found experimentally to be 20 interparticle separations. Second, in dilute suspensions, a vertical variation in the concentration due to the spreading of the front with the clear fluid can inhibit the velocity fluctuations. In a very dilute regime, a homogeneous suspension of fibers suffers a spontaneous instability in which fast descending fiber-rich columns are separated by rising fiber-sparse columns. In a semidilute regime, the settling is hindered, more so than for spheres. © 2011 by Annual Reviews. All rights reserved.en
dc.description.sponsorshipWe thank L. Bergougnoux, J.E. Butler, B. Metzger, M. Nicolas, D. Saintillan, and P. Snabre forsupplying data, figures, and movies. While writing this, E.J.H. was partially supported by awardKUK-C1-013-04 made by King Abdullah University of Science and Technology (KAUST).en
dc.publisherAnnual Reviewsen
dc.subjectdiffusionen
dc.subjectlow Reynolds numberen
dc.subjectslender bodyen
dc.subjectstructural instabilityen
dc.subjectsuspensionen
dc.titleFluctuations and Instability in Sedimentationen
dc.typeArticleen
dc.identifier.journalAnnual Review of Fluid Mechanicsen
dc.contributor.institutionIUSTI Institut Universitaire des Systemes Thermiques Industriels, Marseille, Franceen
dc.contributor.institutionUniversity of Cambridge, Cambridge, United Kingdomen
kaust.grant.numberKUK-C1-013-04en
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