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Experimental investigation of single particle settling in turbulence generated by oscillating grid.

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Experimental investigation of single particle settling in turbulence generated by oscillating grid.

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dc.contributor.author Zhou, Qi.
dc.contributor.author Cheng, Nian-Sheng
dc.date.accessioned 2012-03-26T07:50:07Z
dc.date.available 2012-03-26T07:50:07Z
dc.date.copyright 2008
dc.date.issued 2012-03-26
dc.identifier.citation Zhou, Q. & Cheng, N. S. (2009). Experimental investigation of single particle settling in turbulence generated by oscillating grid. Chemical Engineering Journal, 149(1-3), 289-300.
dc.identifier.uri http://hdl.handle.net/10220/7681
dc.description.abstract In this study, turbulence influence on the settling behavior of solid particles was investigated experimentally in confined turbulent aquatic environment generated by oscillating grid. An enhanced PIV system was employed to conduct simultaneous velocity measurements of individual settling particles and ambient fluid. Grains varying in shape (spherical and cylindrical) and diameter (2.78-7.94 mm) were tested with different turbulent conditions. The results showed clearly that the settling behavior of particles subjected to turbulence is significantly modified. First, the settling velocity modification is closely correlated to the mean vertical velocity of the fluid zone (very close to the settling particle), which in size is in the order of a few particle diameters. Second, the relative settling velocity is smaller than the still water terminal velocity for the most cases. Lastly, the fluctuation in the settling velocity is significantly increased, as compared to the still water conditions, and clearly dependent on the turbulence intensity. The experimental data were also analyzed with dimensional considerations. By comparing to literature, turbulence effects on the relative settling velocity were discussed with regard to Stokes number, Richardson number and dimensionless turbulence length scale. Finally, a simple analytical model was proposed for estimating the turbulence-modified settling velocity.
dc.format.extent 53 p.
dc.language.iso en
dc.relation.ispartofseries Chemical engineering journal
dc.rights © 2008 Elsevier. This is the author created version of a work that has been peer reviewed and accepted for publication by Chemical engineering journal, Elsevier. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [DOI: http://dx.doi.org/10.1016/j.cej.2008.11.004].
dc.subject DRNTU::Engineering::Civil engineering.
dc.title Experimental investigation of single particle settling in turbulence generated by oscillating grid.
dc.type Journal Article
dc.contributor.school School of Civil and Environmental Engineering
dc.identifier.doi http://dx.doi.org/10.1016/j.cej.2008.11.004

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