Simultaneous Measurement of Flow in Open Flow Channel with Pulsed-Wave-Doppler-Velocimetry and Particle-Image-Velocimetry
Documentation of the data | Raw ultrasound data is stored in HDF format together with relevant metadata (using SI base units). The dimensions of the sample data are: sequences x emissions x samples with the respective time bases being: SRI (sequence repetition interval), PRI (pulse repetition interval) and sampling frequency. Velocity profiles can be calculated over emissions and samples. Sequences represent repeated measurements at a fixed rate. Ultrasound transmissions are realized with number_of_period periods of a square wave at a frequency of center_frequency PIV images are stored in TIF format with a framerate of 40Hz. Each setpoint is defined by the flow rate of a pump that drives the flow channel. Its value (in m3/h) is used to identify the setpoint for UDV and PIV measurements in names of folders or files. | |
Description of the data | The flow channel has a crosssection of 31cm x 41cm and is filled up to a height of 35cm with water at approximately 15°C seeded with particles of medium size of 100µm. Ultrasonic transducer mounted upstream in the center of the channel. PIV images taken through transparent side wall with illumination through a window in the channel's floor. PIV calibration is conducted with a ruler placed in the channel as shown in the dedicated picture Photos of the physical setup are provided. | |
Type of the data | Image | |
Type of the data | Sound | |
Type of the data | Other | |
Total size of the dataset | 3047879996 | |
Author | Schierling, Lennart | |
Author | Kunz, Robert | |
Upload date | 2026-01-13T09:33:09Z | |
Publication date | 2026-01-13T09:33:09Z | |
Data of data creation | 2025-04-02 | |
Publication date | 2026-01-13 | |
Abstract of the dataset | Simultaneous measurement of flow velocity in an open flow channel via ultrasound (Pulsed-Wave-Doppler principle) and optical methods (Particle-Image-Velocimetry). The dataset contains the unprocessed ultrasound signals as well as the images taken by a high speed camera for a set of flow states | |
Public reference to this page | https://opara.zih.tu-dresden.de/handle/123456789/1929 | |
Public reference to this page | https://doi.org/10.25532/OPARA-1058 | |
Publisher | Technische Universität Bergakademie Freiberg | |
Licence | Attribution-NonCommercial-ShareAlike 4.0 International | en |
URI of the licence text | http://creativecommons.org/licenses/by-nc-sa/4.0/ | |
Specification of the discipline(s) | 4::44 | |
Title of the dataset | Simultaneous Measurement of Flow in Open Flow Channel with Pulsed-Wave-Doppler-Velocimetry and Particle-Image-Velocimetry | |
Research instruments | Vision Research Phantom VEO 710L | |
Research instruments | Ultrasonic Transducer Signal Processing TR0210LH (2MHz) | |
Research instruments | Light Source Osram PLPT9 450LB_E | |
opara.descriptionObject | Open Flow Channel | |
Underlying research object | Prototype of Integrated Ultrasound Platform (IUP) | |
Project abstract | The DRESDYN precession experiment is designed to improve our understanding of the dynamo effect. The core of the experiment is a cylinder filled with 6 tons of liquid sodium, which is rotated around two axes. The precession-driven liquid metal flow creates a magnetic field whose interaction with the flow will be analyzed. Currently, no measurement system exists to directly measure the flow structure and amplitude in this experiment. The main objective of this project is to enable a real-time identification of the global flow states and to determine the amplitude of the main large scale flow modes in the double rotating DRESDYN precession experiment. The measurement of these characteristic amplitudes and the identification of the flow transition provides an approximate idea of the geometrical structure of the flow, allows the derivation and confirmation of scaling laws that describe the efficiency of the flow forcing, and represents the essential prerequisite for an application to realistic planetary dynamo models when comparing with the flow response on the self-excited magnetic field in the saturated dynamo regime. Distributed, synchronized flow measurements using ultrasound will be performed to enable identification of the flow structures. The MSE Lab will develop the required ultrasonic sensors that will be attached to the experiment. The measurement data will be pre-processed locally on an Field Programmable Gate Arrays (FPGA) to enable transmission via a wireless sensor network and thus real-time transmission of the measurement data from the experiment. At Helmholtz-Zentrum Dresden-Rossendorf (HZDR,) the interface between experiment and data analysis is being developed. For this purpose, methods are applied for reconstructing the flow states from the local flow measurement data. On the one hand, the focus is on an efficient reconstruction to provide information about the flow state in real time. On the other hand, detailed reconstructions will be used to analyze the flow after the execution of the experiment to investigate the dynamic properties of the flow when a feedback effect of the self-excited magnetic field occurs. The project allows the analysis of the complex interaction of the flow of an electrically conducting fluid and the induced magnetic field. This enables an in-depth study of magnetohydrodynamic dynamos and thus contributes to a better understanding of dynamo action in the fluid interior of the Earth or similar planetary objects. | |
Funding Acknowledgement | Deutsche Forschungsgemeinschaft (DFG) - Project number 532905681 | |
Public project website(s) | https://gepris.dfg.de/gepris/projekt/532905681 | |
Public project website(s) | https://tu-freiberg.de/sites/default/files/2025-01/Projektsteckbrief_DresDyn.pdf | |
Project title | Real-time identification of flow states in the DRESDYN precession experiment using distributed ultrasound sensors |
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