New developments on Lorentz force velocimetry for weakly conducting fluids. - In: Proceedings, ISBN 978-2-9553861-0-1, (2015), S. 299-302
The distinction of instability and turbulence between the Taylor-Couette flow and electrically driven flow in annular channel. - In: Proceedings, ISBN 978-2-9553861-0-1, (2015), S. 191-194
Numerical simulation of swirling flow in the pipe under non-uniform magnetic field. - In: Proceedings, ISBN 978-2-9553861-0-1, (2015), S. 171-174
Numerical simulation of a round jet in the presence of an axial magnetic field. - In: Proceedings, ISBN 978-2-9553861-0-1, (2015), S. 175-178
We report numerical simulations of a submerged round jet of conducting liquid issuing into a square duct in the presence of a uniform axial magnetic field. Starting from a quiescent initial condition, the spatial development of the jet is simulated until the transition or breakup zone is no longer evolving in space or the jet has reached the outlet while eventually be completely suppressed within the computational domain. For even stronger fields the laminar jet becomes unsteady again, which is presumably caused by a MHD pinching mechanism.
Experimental study of an electromagnetic flow meter for liquid metals based on torque measurement during pumping process. - In: Measurement science and technology, ISSN 1361-6501, Bd. 26 (2015), 11, S. 115304, insges. 10 S.
This paper presents a detailed experimental study on an electromagnetic flow measurement technique to measure the flow rate of liquid metals. The experimental setup consists of a contactless electromagnetic pump with a torque sensor mounted on the pump shaft. The electromagnetic pump is composed of two rotating steel discs having embedded permanent magnets with alternating poles. The rotation of the discs creates a travelling sinusoidal magnetic field and eddy currents within the liquid metal. The metal is contained inside the duct located between the discs of the pump. The interaction of the magnetic field and the induced eddy currents generates an electromagnetic Lorentz force providing the pumping effect. The flow rate is proportional to this force. The torque sensor measures the moment of the discs due to the Lorentz force, which is converted to a flow rate value. We name the method Lorentz torque velocimetry (LTV). The full calibration procedure and experimental investigation of the LTV are described. The method can be used as a non-contact flow rate control technique for liquid metals.
https://doi.org/10.1088/0957-0233/26/11/115304
Lorentz force sigmometry: a novel technique for measuring the electrical conductivity of solid and liquid metals. - In: Measurement science and technology, ISSN 1361-6501, Bd. 26 (2015), 11, S. 115605, insges. 7 S.
In this paper, a novel method to measure the electrical conductivity of solid and molten metals is described. We term the method 'Lorentz force sigmometry', where the term 'sigmometry' refers to the letter sigma σ, often used to denote the electrical conductivity. The Lorentz force sigmometry method is based on the phenomenon of eddy currents generation in a moving conductor exposed to a magnetic field. Based on Ampere's law, the eddy currents in turn generate a secondary magnetic field; as a result, the Lorentz force acts to brake the conductor. Owing to Newton's third law, a measurable force, which is equal to the Lorentz force and is directly proportional to the electrical conductivity of the conductive fluid or solid, acts on the magnet. We present the results of the measurements performed on solids along with the initial measurements on fluids with a eutectic alloy composition of Ga67In20.5Sn12.5; detailed measurements on molten metals are still in progress and will be published in the future. We conducted a series of experiments and measured the properties of known electrical conductive metals, including aluminum and copper, to compute the calibration factor of the device, and then used the same calibration factor to estimate the unknown electrical conductivity of a brass bar. The predicted electrical conductivity of the brass bar was compared with the conductivity measured with a commercial device called 'SigmaTest'; the observed error was less than 0.5%.
https://doi.org/10.1088/0957-0233/26/11/115605
Towards metering tap water by Lorentz force velocimetry. - In: Measurement science and technology, ISSN 1361-6501, Bd. 26 (2015), 11, S. 115302, insges. 11 S.
https://doi.org/10.1088/0957-0233/26/11/115302
Controlling exciton diffusion and fullerene distribution in photovoltaic blends by side chain modification. - In: The journal of physical chemistry letters, ISSN 1948-7185, Bd. 6 (2015), 15, S. 3054-3060
http://dx.doi.org/10.1021/acs.jpclett.5b01059
Quantitative evaluation of inhomogeneous device operation in thin film solar cells by luminescence imaging. - In: Applied physics letters, ISSN 1077-3118, Bd. 107 (2015), 7, S. 073302, insges. 5 S.
https://doi.org/10.1063/1.4929343
Wärme- (Energie)- Speicherentwicklungen aus Ilmenau. - In: Thermische Solarenergie, (2015), S. 88-89