Z. Lyu, Ch. Karcher, A. Thess
Lorentz Force Velocimetry Applied to Liquid Metal Two-phase Flow
Lorentz force velocimetry (LFV) is a non-contact electromagnetic flow measurement technique for electrically conductive liquids. We aim to extend LFV to liquid metal two-phase flow measurement. In a previous test we consider the free rising of non-conductive bubbles/particles in a thin tube of liquid metal (GaInSn) initially at rest. Here the measured force is due to the displacement flow induced by the rising bubble/particle. We observe that the Lorentz force strongly depends on the size of the bubble/particle and the local position at which it travels through the applied magnetic field. However, the free rising velocity cannot be controlled, which is problematic for the statistics of LFV measurement. Therefore, in this paper we present experimental results obtained in an improved setup of controllable particle motions in liquid metal. In this experiment the particle rises with a straight fishing line, which suppresses any lateral motion and is pulled by a linear driver at controllable velocity. We observe the scaling laws of Lorentz force depending on particle velocity and distance between magnet and liquid.
Proceedings of the VIII International Scientific Colloquim "Modelling for Materials Processing", Riga, Latvia, (2017), pp. 295-299.