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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Sediment management and morphodynamics : An approach for estimating settling velocity in turbulent flows
An approach for estimating settling velocity in turbulent flows
Author : SEBNEM ELÇİ(1)
Precise estimation of the settling velocity of particles in turbulent flows is required for many engineering applications
including modeling of the transport of suspended sediments and the transport of particle pollutants. This study attempts to
quantify the turbulence from direct measurements at a reservoir and presents an approach for estimation of settling
velocities of suspended sediments modified by the quantified turbulence. A novel application of acoustic Doppler
instruments for measurement of settling velocities was presented considering the fact that settling velocity of particles are
commonly estimated indirectly from the balance of settling and diffusive gradients. In the present study, synchronized 3-D
velocity and temperature time series were monitored at Tahtali Reservoir in Turkey where the data were utilized to
characterize the turbulence characteristics by various means (i.e. buoyancy flux, Richardson flux and Stokes number)
provided in the literature. Stokes¡¯ settling velocities modified by the turbulent characteristics were compared with the
measured settling velocities to discuss which parameters have the greatest impact on the settling mechanism and need to
be considered in the presented approach. The results of the study revealed that, when production of turbulence was high,
modified settling velocities matched the monitored velocities better. So; it was concluded that modification of Stokes¡¯
settling velocities by turbulent kinetic energy production profiles performs better for high turbulent conditions.
File Size : 406,984 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Sediment management and morphodynamics
Date Published : 19/08/2015
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