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• W2189039493 abstract "Lorentz force sigmometry, LOFOS, is a novel technique with three different configuration setups for measuring different physical properties of molten metals such as electrical conductivity, viscosity, and density. However, this thesis focuses on measuring the electrical conductivity of the solid and molten metals using the so-called mobile LOFOS setup. The interaction of an electrically conducting fluid with an externally applied magnetic field leads to a force that acts upon the magnetic field generating system and drags it along the flow direction[Thess:2007]. This force linearly depends on the electrical conductivity of the conducting fluid and can be measured using force sensors. The aim of this study was to test and successfully prove that LOFOS can measure the electrical conductivity of solid and molten metals. Several experiments were performed to achieve this goal, starting with experiments using three solid cylindrical bars made of copper, aluminum, and brass 300 mm in length and 10 mm in diameter. The first series of experiments were carried out with known electrically conductive metals, aluminum and copper, in order to compute the calibration factor of the device. We then used the same calibration factor to estimate the unknown electrical conductivity of a brass bar [Alkhalil: 2015]. The setup of LOFOS for solid measurements required some technical changes as compared to the one for fluid measurements. This modification was necessary to extend the interaction time between the solid bar and the external magnetic field generated by a Halbach cylinder magnet. The second series of experiments were with molten metals. The first series with known physical properties alloy having the composition of Ga67In20.5Sn12.5. This is a eutectic alloy at room temperature, and its melting temperature is Tm = 10.5 °C whereas the second series was carried out with high-temperature molten tin at Tm = 232 °C. For fluid measurements, we fabricated a special quartz conical vessel able to withstand temperatures ranging from room temperature up to 1000 °C. The nozzle had a diameter of 8 mm, and it allowed the flow of molten metal across the magnet system during some seconds, which is reasonable for measuring the Lorentz force with good accuracy. In order to protect the LOFOS force measurement system from high temperatures, we added an external air compressor pump to the LOFOS setup. Both experiments with solid and molten metals prove that Lorentz force sigmometry is able to measure the electrical conductivity of solid and molten metals. The uncertainty of solid measurements is in total up to 5%, while for molten metals measurements is less than 10% ." @default.
• W2189039493 created "2016-06-24" @default.
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• W2189039493 date "2015-10-09" @default.
• W2189039493 modified "2023-09-29" @default.
• W2189039493 title "Lorentz force sigmometry: a novel technique for measuring the electrical conductivity of solid and liquid metals" @default.
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• W2189039493 doi "https://doi.org/10.1088/0957-0233/26/11/115605" @default.
• W2189039493 hasPublicationYear "2015" @default.
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