New developments on Lorentz force velocimetry for weakly conducting fluids

R Ebert (1) , C Resagk (1)

1 Institute of Thermodynamics and Fluidmechanics

We report on the progress of the Lorentz force velocimetry (LFV): a contactless non-invasive flow velocity measurement technique. This method has been developed and demonstrated for various applications in our institute [1] and in industry [2]. At applications for weakly conducting fluids such as electrolytes with conductivities in the range of 1 – 10 S/m the challenging bottleneck is the detection of the tiny Lorentz forces in the noisy environment of the test channel. For the force measurement a state-of-the-art electromagnetic force compensation balance is used. Due to this device the mass of the Lorentz force generating magnets is limited. For enabling larger magnet systems and for higher force signals we have developed and tested a buoyancy based weight force compensation method which will be presented here.

Mots clés: Lorentz force velocimetry; weakly conducting fluids; force measurement; non-invasive

Domaines: Sciences de l'ingénieur [physics]

R Ebert, C Resagk. New developments on Lorentz force velocimetry for weakly conducting fluids. 8th International Conference on Electromagnetic Processing of Materials, Oct 2015, Cannes, France. ⟨hal-01334114⟩