Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/83696
Title: Experimental investigation of single particle settling in turbulence generated by oscillating grid
Authors: Zhou, Qi.
Cheng, Nian-Sheng
Keywords: DRNTU::Engineering::Civil engineering
Issue Date: 2008
Source: 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.
Series/Report no.: Chemical engineering journal
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.
URI: https://hdl.handle.net/10356/83696
http://hdl.handle.net/10220/7681
DOI: 10.1016/j.cej.2008.11.004
Schools: School of Civil and Environmental Engineering 
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].
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:CEE Journal Articles

Files in This Item:
File Description SizeFormat 
Experimental_investigation_of_single_particle_settling_in[1].pdf709.76 kBAdobe PDFThumbnail
View/Open

SCOPUSTM   
Citations 20

24
Updated on Jun 4, 2024

Web of ScienceTM
Citations 20

22
Updated on Oct 29, 2023

Page view(s) 5

1,207
Updated on Jun 11, 2024

Download(s) 10

485
Updated on Jun 11, 2024

Google ScholarTM

Check

Altmetric


Plumx

Items in DR-NTU are protected by copyright, with all rights reserved, unless otherwise indicated.