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Ball release experiments on a centrifuge : misalignment between the buoyancy force and the axis of rotation

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dc.contributor.author Riemenschneider, Ulrike
dc.contributor.author Sheremet, Vitalii A.
dc.date.accessioned 2007-10-15T19:30:53Z
dc.date.available 2007-10-15T19:30:53Z
dc.date.issued 2006-09-15
dc.identifier.citation Journal of Fluid Mechanics 564 (2006): 435-454 en
dc.identifier.uri http://hdl.handle.net/1912/1819
dc.description Author Posting. © Cambridge University Press, 2006. This article is posted here by permission of Cambridge University Press for personal use, not for redistribution. The definitive version was published in Journal of Fluid Mechanics 564 (2006): 435-454, doi:10.1017/S0022112006001522. en
dc.description.abstract Motivated by work on tilted convection (Sheremet, J. Fluid Mech., vol. 506, 2004, p. 217), a set of experiments is presented here using the same set-up of a tilted tank attached to a rotating centrifuge with a 2.5 m arm. Within the tank small, almost neutrally buoyant, spheres are released, and their trajectories are recorded. Thus the forces acting on a sphere can be analysed in the case of misalignment between the buoyancy force and the axis of rotation. The angles of descent characterizing the trajectory are compared with inviscid linear theory developed by Stewartson (Q. J. Math. Appl. Mech., vol. 6, 1953, p. 141), and the agreement is found to be good. The angles should be independent of the density anomaly of the spheres compared to their environment. Using the descent velocity from non-rotating experiments, the density of the spheres is estimated and used to determine the drag acting on them in the rotating experiments. It is found that the drag is up to 50% larger than expected from Stewartson's theory. The agreement is best, not for infinitesimal, but for small Rossby numbers. The results are consistent with observations recorded by Maxworthy (J. Fluid Mech., vol. 40, 1970, p. 453). en
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher Cambridge University Press en
dc.relation.uri http://dx.doi.org/10.1017/S0022112006001522
dc.title Ball release experiments on a centrifuge : misalignment between the buoyancy force and the axis of rotation en
dc.type Article en
dc.identifier.doi 10.1017/S0022112006001522


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