Simultaneous volumetric temperature and velocity measurements in microfluidics using luminescent polymer particles. - In: ExHFT-9 2017, (2017), insges. 9 S.
Heat and mass transport in large aspect ratio Rayleigh-Bénard convection. - In: ExHFT-9 2017, (2017), insges. 8 S.
Simultaneous measurement of the velocity and temperature field in Rayleigh-Benard convection at high aspect ratios :
Simultane Temperatur- und Geschwindigkeitsfeldmessungen in Rayleigh-Bénard Konvektion bei großen Aspektverhältnissen. - In: Experimentelle Strömungsmechanik, ISBN 978-3-9816764-3-3, (2017), Seite 52-1-52-8
Simultane Bestimmung des Temperatur- und Strömungsfeldes basierend auf der Phosphoreszenzlebensdauer von EuTTa. - In: Experimentelle Strömungsmechanik, ISBN 978-3-9816764-3-3, (2017), Seite 51-1-51-10
Development and characterization of microfluidic membraneless fuel cell :
Entwicklung und Charakterisierung einer mikrofluidischen membranlosen Brennstoffzelle. - In: Experimentelle Strömungsmechanik, ISBN 978-3-9816764-3-3, (2017), Seite 15-1-15-6
Influence of a second gaseous phase on Lorentz force velocimetry at low conducting fluids :
Einfluss einer zweiten gasförmigen Phase auf die Lorentzkraft-Anemometrie bei schwach leitfähigen Fluiden. - In: Experimentelle Strömungsmechanik, ISBN 978-3-9816764-3-3, (2017), Seite 30-1-30-6
Lorentz force velocimetry applied to liquid metal two-phase flow. - In: Proceedings of the VIII International Scientific Colloquium Modelling for Materials Processing, (2017), S. 295-299
Dynamics of falling liquid metal droplets and jets influenced by a strong axial magnetic field. - In: Proceedings of the VIII International Scientific Colloquium Modelling for Materials Processing, (2017), S. 283-88
Dynamics of falling liquid metal droplets and jets affected by a strong magnetic field. - In: Magnetohydrodynamics, ISSN 0024-998X, Bd. 53 (2017), 4, S. 739-745
Non-contact electromagnetic shaping of liquid metal free surfaces is crucial in several metallurgic processes including bending or stabilization of jets in casting or fusion applications. In this context, we experimentally study the influence of strong axial magnetic fields up to 5 T on the dynamics of falling droplets and jets. As a test melt, we use GaInSn which is liquid at room temperature. In the experiments, we vary the magnetic flux density, the tilt angle, the liquid metal flowrate, and the diameter and material (conducting/non-conducting) of the nozzle. As major results, we find that under the influence of the field, liquid metal droplets are stretched in the field direction, the droplet rotation ceases, and the droplet axis aligns with the axis of the field. Moreover, we observe that the jet break-up into droplets is suppressed and, for the case of conducting nozzle and tilt, jets are bent towards the field axis.
Electromagnetic interaction between a permanent magnet and laminar flow of a moving sphere in a conducting liquid. - In: Magnetohydrodynamics, ISSN 0024-998X, Bd. 53 (2017), 4, S. 653-665
Lorentz force velocimetry (LFV) is a non-contact electromagnetic flow measurement technique for electrically conducting liquids. It is based on measuring the flow-induced force acting on an externally arranged permanent magnet. Motivated by extending LFV to liquid metal two-phase flow measurement, in a previous test we considered the free rising of non-conductive bubbles/particles in a thin tube of liquid metal (GaInSn) initially at rest. We observed that the Lorentz force signals strongly depend on the size of the bubble/particle and on the position, where it is released. Moreover, the force signals cannot be reproduced in detail, which necessitates a statistical analysis. This is caused by chaotic trajectories due to the rising velocities of about 200 mm/s. Therefore, in this paper, we use an improved setup for controlled particle motions in liquid metal. In this experiment, the particle is attached to a straight fishing line, which suppresses any lateral motion, and is pulled by a linear driver at a controllable velocity (0-200 mm/s). For comparison, we solve the induction problem numerically using Oseen's analytical solution of the flow around a translating sphere that is valid for small but finite Reynolds numbers. This simplification is made since the precise hydrodynamic flow is difficult to measure or to compute. The aim of the present work is to check if our simple numerical model can provide Lorentz forces comparable to the experiments. Although Oseen's solution becomes inaccurate near the sphere for finite Reynolds numbers, it provides a fore-aft asymmetry of the flow and is globally well-behaved. It provides an upper limit to the measurement results. We recover the peak-delay of the Lorentz force signals as well.