Scaling of turbulent heat and momentum transfer for magnetoconvection in a vertical magnetic field. - In: Proceedings of the 10th PAMIR International Conference on Fundamental and Applied MHD, (2016), S. 532-536
Experimental study on bubble rising in liquid GaInSn using Local Lorentz Force Velocimetry (LLFV). - In: Proceedings of the 10th PAMIR International Conference on Fundamental and Applied MHD, (2016), S. 243-246
Numerical simulation of swirling flow in the pipe under non-uniform magnetic field. - In: Proceedings of the 10th PAMIR International Conference on Fundamental and Applied MHD, (2016), S. 234-237
The effects of axial magnetic field on turbulence in Taylor-Couette flow. - In: Proceedings of the 10th PAMIR International Conference on Fundamental and Applied MHD, (2016), S. 224-228
Dry calibration of a new generation local Lorentz force flowmeter. - In: Proceedings of the 10th PAMIR International Conference on Fundamental and Applied MHD, (2016), S. 198-202
DNS of natural convection in liquid metal with strong magnetic fields in rectangular enclosures. - In: Proceedings of the 10th PAMIR International Conference on Fundamental and Applied MHD, (2016), S. 67-71
New developments on Lorentz force velocimetry for weakly conducting fluids. - In: Proceedings of the 10th PAMIR International Conference on Fundamental and Applied MHD, (2016), S. 1-5
Local Lorentz force flowmeter at a continuous caster model using a new generation multicomponent force and torque sensor. - In: Measurement science and technology, ISSN 1361-6501, Bd. 27 (2016), 6, S. 065302, insges. 9 S.
Lorentz force velocimetry is a non-invasive velocity measurement technique for electrical conductive liquids like molten steel. In this technique, the metal flow interacts with a static magnetic field generating eddy currents which, in turn, produce flow-braking Lorentz forces within the fluid. These forces are proportional to the electrical conductivity and to the velocity of the melt. Due to Newton's third law, a counter force of the same magnitude acts on the source of the applied static magnetic field which is in our case a permanent magnet. In this paper we will present a new multicomponent sensor for the local Lorentz force flowmeter (L2F2) which is able to measure simultaneously all three components of the force as well as all three components of the torque. Therefore, this new sensor is capable of accessing all three velocity components at the same time in the region near the wall. In order to demonstrate the potential of this new sensor, it is used to identify the 3-dimensional velocity field near the wide face of the mold of a continuous caster model available at the Helmholtz-Zentrum Dresden-Rossendorf. As model melt, the eutectic alloy GaInSn is used.
http://dx.doi.org/10.1088/0957-0233/27/6/065302
An experimental prototype of an innovative fluid-driven electromagnetic stirring technique. - In: Journal of iron and steel research, international, ISSN 2210-3988, Bd. 23 (2016), 5, S. 422-427
A new electromagnetic stirring technique that is driven by hydrodynamic forces was presented. This technique offers the following advantages. First, the stirrer can be immersed in the liquid metal, thereby significantly increasing the penetration depth of the electromagnetic forces and significantly improving the stirring efficiency; thus, this technique is particularly suitable for large-scale liquid metal. Second, under certain conditions, this technique can overcome difficulties that are encountered with traditional stirrers, such as accessing regions that are difficult to reach in working spaces with complex or narrow shapes. This stirrer also has a simpler structure than a traditional stirrer; thus, the design can be easily modified, and no external power supply is required. An experimental prototype was also presented for controlling the fluid flow rate, thereby controlling the electromagnetic force and velocity field of the driven liquid metal. The velocity distribution in a liquid GaInSn alloy under fluid-driven electromagnetic stirring was quantitatively measured using ultrasonic Doppler velocimetry (UDV). The primary results show that a remarkable velocity field has been achieved and that fluid-driven electromagnetic stirring is an effective means of stirring liquid metal. Finally, the potential applications of this technique in industry, along with key challenges, were discussed.
http://dx.doi.org/10.1016/S1006-706X(16)30067-X
Contactless flow measurement in liquid metal using electromagnetic time-of-flight method. - In: Measurement science and technology, ISSN 1361-6501, Bd. 27 (2016), 5, S. 055102, insges. 12 S.
Measuring flow rates of liquid metal flows is of utmost importance in industrial applications such as metal casting, in order to ensure process efficiency and product quality. A non-contact method for flow rate control is described here. The method is known as time-of-flight Lorentz force velocimetry (LFV) and determines flow rate through measurement of Lorentz force that act on magnet systems that are placed close to the flow. In this method, a vortex generator is used to generate an eddy in the flow, with two magnet systems separated by a known distance placed downstream of the vortex generator. Each of the magnet systems has a force sensor attached to them which detects the passing of the eddy through its magnetic field as a significant perturbation in the force signal. The flow rate is estimated from the time span between the perturbations in the two force signals. In this paper, time-of-flight LFV technique is demonstrated experimentally for the case of liquid metal flow in a closed rectangular duct loop that is driven by an electromagnetic pump. A liquid metal alloy of gallium (Ga), indium (In) and tin (Sn) - GaInSn - is used as the working fluid. In contrast to prior works, for the first time, three-dimensional strain gauge force sensors were used for measuring Lorentz force to investigate the effect of flow disturbances in different directions for flow measurements by the time-of-flight LFV method. A prototype time-of-flight LFV flowmeter is developed, the operation of which in laboratory conditions is characterised by different experiments.
http://dx.doi.org/10.1088/0957-0233/27/5/055102