High-speed 4D PTV system

Vienna University of Technology

wien | Website

Large equipment

Short Description

Optical system for the high-speed measurement of time-resolved, three-dimensional velocity fields in turbulent channel flows.
The system consists of pulsed illumination source (laser, up to 10 kHz) and 4 high-speed cameras (up to 4Mpx).
The flow is seeded with small particles (tracers) that are used to reconstruct the velocity field.
The system is also used to study the dynamics of fibres (length 1 millimeter, diameter 10 micrometer) carried by the flow.

Contact Person

Univ.Prof. Dipl.-Ing. Dr.-Ing. Alfredo Soldati

Research Services

Optical system for the high-speed measurement of time-resolved, three-dimensional velocity fields in turbulent channel flows.
The system can be used to study either the turbulent flow field in a water channel, or to investigate the dynamics of non-axisymmetric object in turbulent flows. Further details available in [1].

[1] Alipour, De Paoli, Ghaemi and Soldati, Long non-axisymmetric fibers in turbulent channel flow, Journal of Fluid Mechanics (2021)

Methods & Expertise for Research Infrastructure

Flow velocity measurements:
The laser illuminates the field of view at a frequency corresponding to the cameras acquisition rate.
The images are stored and preprocessed via DaVis 10 (LaVision GmbH). The velocity field is finally obtain from particle tracking velocimetry (Shake-The-Box). For further details, see [1].

Fibre tracking and velocimetry:
When the flow is seeded with fibres (non-axisymmetric particles), MART is used to reconstruct the fibres orientation and distribution.
First, images are processed with Davis 10 (LaVision GmbH). Then, a MatLab-based in-house code is used to identify the orientation and distribution of the fibres. For further details, see [1].

[1] Alipour, De Paoli, Ghaemi and Soldati, Long non-axisymmetric fibers in turbulent channel flow, Journal of Fluid Mechanics (2021)

Univ.Prof. Dipl.-Ing. Dr.-Ing. Alfredo Soldati
Forschungsbereich Strömungsmechanik
+43 (1) 58801 32213
alfredo.soldati@tuwien.ac.at
http://www.fluid.tuwien.ac.at/AlfredoSoldati
Use by agreement. If interested, please contact Univ.Prof. Dipl.-Ing. Dr.-Ing. Alfredo Soldati.