The role of Ekman pumping and the dominance of swirl in confined flows driven by Lorentz forces

Davidson, P. A.; Kinnear, David J.; Lingwood, R. J.; Short, D; He, Xiaomin

doi:10.1016/s0997-7546(99)00106-5

Cited by 26 publications

(49 citation statements)

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“…Apart from that, the general flow structure in the core remains qualitatively the same. [18,27] Figure 2 displays the spatiotemporal structure of both the azimuthal and the axial flow in the bulk. These plots result from drawing a sequence of one-dimensional velocity profiles recorded consecutively during a measuring time of 30 seconds.…”

Section: Resultsmentioning

confidence: 99%

Intermittent Behavior Caused by Surface Oxidation in a Liquid Metal Flow Driven by a Rotating Magnetic Field

Zhang

Shatrov

Priede

et al. 2011

Metall Mater Trans B

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The focus of the experimental and numerical study presented in this article is on the bulk flow within a swirling liquid metal column driven by a rotating magnetic field (RMF), whereas the free surface of the melt was covered by a distinct oxide layer. Flow measurements revealed an anomalous behavior of the flow: Pronounced oscillations of both the primary swirling and the secondary recirculating flow occur spontaneously. This peculiarity can be attributed to the influence of the oxide layer at the surface of the metal. The motion of the covering layer is governed by the strength of the fluid flow and the properties of the layer, and it might exhibit three different states of motion: permanent rotation, intermittent rotation, or the quiescent state. The regime of an intermittent oxide layer rotation reveals a striking influence on the bulk flow of the liquid metal. The amplitude of the velocity oscillations observed seems to be at least one order of magnitude larger than those of turbulent fluctuations in a steady RMF-driven flow. The essential features of the phenomenon observed were reproduced by a simple numerical model.

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Section: Resultsmentioning

confidence: 99%

Intermittent Behavior Caused by Surface Oxidation in a Liquid Metal Flow Driven by a Rotating Magnetic Field

Zhang

Shatrov

Priede

et al. 2011

Metall Mater Trans B

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“…A typical poloidal flow develops as it was often observed experimentally [47,[85][86][87][88][89]. Similar flow structures are very well known from vacuum arc remelting and electro-slag remelting [90][91][92][93][94][95][96][97]. However, depending on the exact geometry, the direction of the flow might be reversed [98][99][100][101].…”

Section: Resultsmentioning

confidence: 63%

“…Here, the force is well distributed in the whole volume; in [43] it is concentrated only in the centre of the liquid metal "sheet". We suppose the distributed azimuthal Lorentz force to better suppress the poloidal flow by forcing the streamlines into a dissipative Ekman layer [92]. Fig.…”

Section: Resultsmentioning

confidence: 99%

Electromagnetically driven convection suitable for mass transfer enhancement in liquid metal batteries

Weber

Nimtz

Personnettaz

et al. 2018

Applied Thermal Engineering

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Liquid metal batteries (LMBs) were recently proposed as cheap large scale energy storage. Such devices are urgently required for balancing highly fluctuating renewable energy sources. During discharge, intermetallic phases tend to form in the cathode of LMBs. These do not only limit the up-scalability, but also the efficiency of the cells. Generating a mild fluid flow in the fully liquid cell will smoothen concentration gradients and minimise the formation of intermetallics.In this context we study electro-vortex flow numerically. We simulate a recent LMB related experiment and discuss how the feeding lines to the cell can be optimised to enhance mass transfer. The Lorentz forces have to overcome the stable thermal stratification in the cathode of the cell; we show that thermal effects may reduce electro-vortex flow velocities considerable. Finally, we study the influence of the Earth magnetic field on the flow.

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“…In case of swirling flow under a magnetic field, the phenomena are commonly seen in metallurgical MHD, such as in crystal growth processes and solidified ingot. The swirling flows usually maintain a stable laminar flow and a second flow, and are named Ekman pumping [25,26]. The second flow are superimposed on the primary swirling flow.…”

Section: Introductionmentioning

confidence: 99%

“…Later, Bessaïh et al [29] simulated the MHD flows with heat transfer, and analyzed the hydrodynamic and thermal instabilities in an enclosed cylinder with a fixed aspect ratio of c = 2. For the swirling flow under a magnetic field, Davidson et al [26,30] studied Ekman pumping and Bödewadt-Hartmann layers in an axisymmetric pool and an open axisymmetric system, respectively.…”

Section: Introductionmentioning

confidence: 99%

The effect of a uniform magnetic field on vortex breakdown in a cylinder with rotating upper lid

Thess

2013

Computers & Fluids

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The role of Ekman pumping and the dominance of swirl in confined flows driven by Lorentz forces

Cited by 26 publications

References 0 publications

Intermittent Behavior Caused by Surface Oxidation in a Liquid Metal Flow Driven by a Rotating Magnetic Field

Intermittent Behavior Caused by Surface Oxidation in a Liquid Metal Flow Driven by a Rotating Magnetic Field

Electromagnetically driven convection suitable for mass transfer enhancement in liquid metal batteries

The effect of a uniform magnetic field on vortex breakdown in a cylinder with rotating upper lid

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