B6.4 - Towards metering of Tap water by Lorentz force velocimetry: Realization and improvement of non-contact flow measurement method
- AMA Conferences 2015
2015-05-19 - 2015-05-21
- Proceedings SENSOR 2015
- B6 - Flow I
- S. Vasilyan, T. Fröhlich - Technische Universität Ilmenau (Germany)
- 303 - 308
The present work describes recent improvement on non-contact/non-intrusive flow measurements method by means of Lorentz Force Velocimetry. Particularly, flow metering in channel of purely conducting fluid in range of 10-2 to 101 S/m conductivities and 0.2 to 4 m/s velocities are discussed. Method is realized based on high resolution measurements of single axis horizontal directed forces. These are reaction forces that are acting to the magnet system as a result of induced Lorentz force due to transverse interaction of magnetic field of magnets and velocity field of the flow. Test measurements of forces, which are linearly proportional to conductivity and velocity, are conducted by differential force measurement system developed based on State of the Art ultra-precision balances. We present measurements in order of 10-8 to 10-6 N as a function of electrolyte flow rate and corresponding sensitivity considerations. Typical measurement range of ≈4x10-6N forces corresponding to the flow of saline water with conductivity of 1S/m and velocity of 1m/s in a rectangular duct with a 50x50mm cross-section. The precision and stability of measurement signal is examined under environmental influences such as thermal radiation and ground vibration and their reduction mechanisms are discussed respectively.