Affiliations: [a] Institute of Thermodynamics and Fluid Mechanics,
Technische Universität Ilmenau, Ilmenau, Germany | Leibniz University of Hannover, Hannover, Germany | University of Pavia, Pavia, Italy | University of Padua, Padua, Italy
Correspondence:
[*]
Corresponding author: D. Schumacher, Institute of Thermodynamics
and Fluid Mechanics, Technische Universität Ilmenau, P.O. Box 100565,
D-98684 Ilmenau, Germany. Tel.: +49 3677 69 2465; Fax: +49 3677 69 2411;
E-mail: dandan.schumacher@tu-ilmenau.de
Abstract: This paper attempts to present a novel development of an
electromagnetic non-contact surface velocity measurement technique in
electrically conducting liquids which could be applied in high-temperature
metallurgical processes involving metal melts. The technique is based on
Lorentz force velocimetry, i.e. on measuring the force which is generated by
the interactions of the melt flow and an externally applied magnetic field that
is spanned by permanent magnet system. The electromagnetically induced force
pushes the magnet system into the direction of the flow and can be measured
using a force sensor that is attached to the magnet system. As the measured
force linearly depends on melt velocity, a non-contact evaluation of the
velocity can be achieved. However, the recorded force also depends on the
electrical conductivity of the melt. In application this material property is a
priori unknown as it strongly depends on both temperature and composition of
the melt. Hence, calibration of such a measuring device becomes a cumbersome
task. Our development aims to circumvent this deficit by applying a
time-of-flight technique. According to this principle we design and test a
prototype of sensor for measuring free-surface velocity. In the model
experiments we use both solid bodies and the liquid metal GaInSn as test liquids.
Keywords: Time-of-flight Lorentz force velocimetry, Meniscus Velocity Sensor, free-surface liquid metal flow
