An experimental study on the motion of buoyant particles in the free-surface vortex flow

Experiments are conducted in a Ø600 mm tank to analyse the 3D motion of buoyant particles in the free-surface vortex flow. The experiments revealed two stages in the particle motion: stage 1 is the helical motion along the vortex air core and stage 2 is the axial motion inside the vortex core. The stage 1 motion is sensitive to the particle’s...

On the free-surface vortex driven motion of buoyant particles

This is an experimental and theoretical research on the motion of buoyant particles in the flow of a free-surface vortex at moderate to high particle Reynolds numbers.

Experimental study on the 3D-flow field of a free-surface vortex using stereo PIV

In order to analyse the flow characteristics of free-surface vortexes and to validate the Burgers vortex model by using stereo particle image velocimetry, experiments are conducted in a 600 mm diameter vortex tank. Measured axial velocities indicate that 10–25% of the flow is transported through the vortex core. The velocity profiles show that...

Statistical modelling of Fat, Oil and Grease (FOG) deposits in wastewater pump sumps

The accumulation of FOG (Fat, Oil and Grease) deposits in sewer pumping stations results in an increase in maintenance costs, malfunctioning of pumps and, a potential increase of wastewater spills in receiving open water bodies. It is thought that a variety of parameters (e.g. geometry of the pump sump, pump operation, socioeconomic...

3D-PTV on large particles in the free-surface vortex

Wastewater pumping stations can experience problems due the presence of floating particles of solidified fat and grease. To transport this debris, the ability of free-surface vortices as transport mechanism is investigated. An experimental set-up is developed where the behaviour of large particles (0.02 - 0.04 m) in the vortex flow are analysed....

Experimental research on free-surface vortices as transport mechanism in wastewater sumps

Sumps of wastewater pumping station can experience problems due the formation of (solid) floating layers of fat and scum as a result of insufficient current guidelines for sump design with respect to transport of floating debris. To complimentary the guidelines, the use of free-surface vortices is defined as a potential transport mechanism for...

Verification of Delft FLS

Nowadays flooding because of a dike breach can be simulated with high accuracy by use of computer models. Delft FLS, which stands for DELFT Flooding System, developed by WL - Delft Hydraulics, is such a model. The hydrodynamic processes occurring during a flooding are complex, for example moving hydraulic jumps and propagating bores. The...