Spatial and temporal resolution of a Local Lorentz Force Flowmeter

Electromagnetic measurement techniques are very promising for accessing the flow properties of liquid melts. We extend one of the recently developed techniques, Lorentz Force Velocimetry, to the measurement of spatial flow structures close to the wall of the confining container. The sensor we use is called Local Lorentz Force Flowmeter (L2F2). It comprises a small permanent magnet which is attached to a force measurement system. We demonstrate that it is possible to reconstruct the complex flow in the vicinity of the wall of a confined vessel using the L2F2. Additionally, we show with the help of a solid body experiment that the L2F2 responds to temporal changes in the flow on the order of 1 Hz.