Electromagnetic Processing of Materials at the Department Inorganic-Nonmetallic Materials

This paper illustrates an overview of current research activities in the working group 'Electromagnetic Processing of Materials' of the department Inorganic-Nonmetallic Materials.These are 'Electromagnetic module to flow impact in special melting plants for the production of High-tech glasses', 'Numerical study of EM controlled flow in crystallizers of inorganic materials', 'Design,test and optimization of sophisticated magnet systems for Lorentz force velocimetry in electrially low conducting fluids', 'Magnetic ion manipulation in glass melts with Kelvin force', 'Electromechanical dry t'me milling of raw materials' and 'Synthesis,characterization and application of Titatium doped hexaferrites'.The primary results are presented here.

Assembling and Test of a Halbach Array Magnet System for Lorentz Forece Velocimetry in Electrolytes

The paper presents a Halbach array magnet system(HAMS)for the application within a very first Lorentz force velocimetry(LFV)experiment for electrolytic flows.Here the design,assembling procedure and characterization method are presented under consideration of the strict limited weight of the system.HAMS increase the Lorentz force outcome by a factor of three compared to the currently used simple magnet systems.Furthermore the fluid profile influence on a LFV measurement on electrolytes is investigated numerically-directly on the planned test setup-and presented for the first time.Here the Lorentz forces,generated by the HAMS,decreases by 8%comparing an ideal plug-like profile at the inlet with a semi-parabolic profile arising near the outlet of the experiment.

Lorentz Force Velocimetry for Poorly Conducting Fluids-Development and Validation of a Novel Flow Rate Measurement Device

The paper demonstrated the feasibility of Lorentz Force Velocimetry for flow rate measurements of weakly conducting electrolytes using experimental results on salt water flow exposed to a permanent magnet system.This innovative flow measurement technique allows the non-contact determination of flow rates and relies on the interaction between a magnetic field and a moving conducting fluid.When an electrically conducting fluid moves through the magnetic field a Lorentz force is generated and acts on the measurement system.The present report provides an overview about the experimental setups and the first measurement results.

Migration of Paramagnetic Ions in Glass Melts Under Influence of a Magnetic Field

Magnetic forces are widely used to influence the properties of materials.The main focus of recent investigations concerning oxide melts mainly was on the use of Lorentz forces either to mix glass melts to avoid an improved inhomogeneity or to measure the flow of these melts.In the last years also the use of magnetic gradient forces has become an object of research mainly in electrochemistry.On the basis of preliminary investigations the influence of these forces on paramagnetic ions such as Fe;in oxide melts is investigated to examine the potential of magnetic gradient forces as a tool to create defined gradient materials.