Lorentz force velocimetry using small-size permanent magnet systems and a multi-degree-of-freedom force-torque sensorReportar como inadecuado




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1 Institute of Thermodynamics and Fluid Mechanics

Abstract : Lorentz force velocimetry is a contactless velocity measurement technique for electrically conductive liquids like molten steel. In this technique, a localized static magnetic field is applied on a flowing metalmelt generating eddy currentsand,therefore, a flow-braking Lorentz force withinthe fluid. Hence, due to Newton’s third law, a force of same magnitude acts on the magnet system which is connected to a force sensor. According to the principles of magnetohydrodynamics, this force is proportional to the velocity of the liquid metal. Depending on the volume subset of the flow which interacts withthe magnetic field lines produced by permanent magnets, we have local Lorentz force velocimetry LFV or Lorentz force flow meter. In the case of the Lorentz force flow meter, the magnetic field lines penetrate the entire cross-section on the flow given access to flow rate information. Inregard to local LFV, significantly smaller magnets are used for local velocity measurements. This paper presents the possibility of increasing the spatial resolution of the model experimentand acquiring more information of the flow, e.g. local velocity gradient, by introducing a novel arrangement of small-size permanent magnets connected to a multi-degree-of-freedom force-torque sensor.

Keywords : velocity measurement liquid metal contactless





Autor: D Hernández - C Karcher -

Fuente: https://hal.archives-ouvertes.fr/



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