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Experimental analysis of turbulence effect in settling velocity of suspended sediments

By H. Salinas–Tapia, J.A. García–Aragón and C. Díaz–Delgado

Abstract

Settling velocities of sediment particles for different size ranges were measured in this work using PIV with the help of discriminatory filters. An experimental channel 10x15 cm cross section was used in order to obtain two set of turbulent characteristics corresponding with two different flow rates. The purpose was to analyze the effect of turbulence on the solids settling velocity. The technique allowed us to measure the individual settling velocity of the particles and the flow velocity field of the fluid. Capture and image analysis was performed with digital cameras (CCD) using the software Sharp–provision PIV and the statistical cross correlation technique. Results showed that settling velocity of particles is affected by turbulence which enhances the fluid drag coefficient. Physical explanation of this phenomenon is related with the magnitude of the vertical fluctuating velocity of the fluid. However, more research is needed in order to define settling velocity formulas that takes into account this effec

Topics: Sediments, turbulence, settling velocity, PIV, drag coefficient, particle size., Technology (General), T1-995, Technology, T, DOAJ:Technology (General), DOAJ:Technology and Engineering, Engineering (General). Civil engineering (General), TA1-2040, DOAJ:General and Civil Engineering
Publisher: Universidad Nacional Autónoma de Mexico
Year: 2008
OAI identifier: oai:doaj.org/article:23cb1c17aa584f63bc2c20c03117bd45
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