TY - JOUR
T1 - A simple measuring set-up for the experimental determination of the dynamics of a large particle in the 3D velocity field around a free surface vortex
AU - Duinmeijer, Simon P.A.
AU - Moreno-Rodenas, Antonio M.
AU - Lepot, Mathieu
AU - van Nieuwenhuizen, Christian
AU - Meyer, Irene
AU - Clemens, François H.L.R.
PY - 2019
Y1 - 2019
N2 - Vortices are a very common phenomenon to consider in many hydraulic engineering problems, e.g. when designing pump sumps or intake works for turbines. Until now, the focus is on avoiding the development of vortices because of induction of cavitation and air entrainment by a fully developed air core. However, vortices may also be used in a more positive manner e.g. by taking advantage of the capacity to transport (floating) particles to avoid the built up of scum layers in wastewater pump sumps. To the authors’ knowledge only little literature is available in this specific field of research. In order to obtain state-of-the art data on the dynamics of large particles in a free-surface vortex flow field and to examine the vortex transport capacity, a simple but novel 3D-PTV (Particle Tracking Velocimetry) method using 6 iPhones was designed, built, tested and employed to measure the 3D-motion of a large particle in the vortex flow. The experimental set-up, particle detection method and the post-processing of the raw data are described in detail along with some first experimental results. The presented 3D-PTV method showed to be able to obtain data that can be used for detailed analysis of the dynamics of large particles in the vortex flow. The overall standard uncertainty of the particle centre position is in the order of magnitude of 0.1 mm in each direction in a volume of a diameter of 0.6 m and a height of about 1 m, while recording at 240 fps.
AB - Vortices are a very common phenomenon to consider in many hydraulic engineering problems, e.g. when designing pump sumps or intake works for turbines. Until now, the focus is on avoiding the development of vortices because of induction of cavitation and air entrainment by a fully developed air core. However, vortices may also be used in a more positive manner e.g. by taking advantage of the capacity to transport (floating) particles to avoid the built up of scum layers in wastewater pump sumps. To the authors’ knowledge only little literature is available in this specific field of research. In order to obtain state-of-the art data on the dynamics of large particles in a free-surface vortex flow field and to examine the vortex transport capacity, a simple but novel 3D-PTV (Particle Tracking Velocimetry) method using 6 iPhones was designed, built, tested and employed to measure the 3D-motion of a large particle in the vortex flow. The experimental set-up, particle detection method and the post-processing of the raw data are described in detail along with some first experimental results. The presented 3D-PTV method showed to be able to obtain data that can be used for detailed analysis of the dynamics of large particles in the vortex flow. The overall standard uncertainty of the particle centre position is in the order of magnitude of 0.1 mm in each direction in a volume of a diameter of 0.6 m and a height of about 1 m, while recording at 240 fps.
KW - 3D-PTV
KW - Pump sumps
KW - Solids
KW - Vortex
KW - Wastewater
UR - http://www.scopus.com/inward/record.url?scp=85057084507&partnerID=8YFLogxK
U2 - 10.1016/j.flowmeasinst.2018.10.007
DO - 10.1016/j.flowmeasinst.2018.10.007
M3 - Article
AN - SCOPUS:85057084507
SN - 0955-5986
VL - 65
SP - 52
EP - 64
JO - Flow Measurement and Instrumentation
JF - Flow Measurement and Instrumentation
ER -