The sensitivity of a travelling magnetic field driven flow to axial alignment

Cramer, A.; Pal, J.; Koal, Kristina; Tschisgale, Silvio; Stiller, Jörg; Gerbeth, Günter

doi:10.1016/j.jcrysgro.2011.02.020

Cited by 14 publications

(4 citation statements)

References 30 publications

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“…This approach has shown a fairly good agreement with experimental data given in Refs. [24,25]. Therefore, it is one of the goals of the current work to investigate the applicability of this approach also for the given setup, even when a relatively coarse mesh is used.…”

Section: Propertymentioning

confidence: 99%

“…Changes in the flow pattern can be expected if the melt or TMF geometry is significantly altered. The effect of shifting a cylindrical melt from the axis of the TMF coil system has been recently addressed by Cramer et al [25], where a significant influence of shifts of even less than 2% of the melt diameter was observed. In the current study, the melt was shifted horizontally by 4 cm perpendicular to one of the side surfaces.…”

Section: Influence Of Melt Axis Shiftmentioning

confidence: 99%

“…Isothermal axisymmetric model melts in a TMF are presented in Refs. [23][24][25]27]. A recent work [26] considers additional, VGFtype temperature gradients.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Model experiments and numerical simulations for directional solidification of multicrystalline silicon in a traveling magnetic field

Dadzis¹,

Ehrig²,

Niemietz³

et al. 2011

Journal of Crystal Growth

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Section: Propertymentioning

confidence: 99%

Section: Influence Of Melt Axis Shiftmentioning

confidence: 99%

See 1 more Smart Citation

Model experiments and numerical simulations for directional solidification of multicrystalline silicon in a traveling magnetic field

Dadzis¹,

Ehrig²,

Niemietz³

et al. 2011

Journal of Crystal Growth

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“…Thus, a combination of these two types of magnetic fields may be suitable for a wide range of shapes. A helical magnetic field can be obtained in this way using current-carrying coils [5][6][7][8][9] or a permanent magnetic field. [10][11][12] Vive`s et al [10][11][12] designed a helical permanent magnetic field to stir a semi-solid melt and mix the secondary phase (i.e., the micro-scale particles within the semi-solid melt) to fabricate metal matrix composites.…”

Section: Introductionmentioning

confidence: 99%

Flow Driven by an Archimedean Helical Permanent Magnetic Field. Part I: Flow Patterns and Their Transitions

Wang

Etay

et al. 2016

Metall Mater Trans B

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International audienceIn this study, an Archimedean helical permanent magnetic field was constructed and its driving effects on liquid metal were examined. A magnetic stirrer was constructed using a series of arc-like magnets. The helical distribution of its magnetic field, which was confirmed via Gauss probe measurements and numerical simulations, can be considered a combination of rotating and traveling magnetic fields. The characteristics of the flow patterns, particularly the transitions between the meridian secondary flow (two vortices) and the global axial flow (one vortex), driven by this magnetic field were quantitatively measured using ultrasonic Doppler velocimetry. The transient and modulated flow behaviors will be presented in a companion article. The D/H dimension ratio was used to characterize the transitions of these two flow patterns. The results demonstrated that the flow patterns depend on not only the intrinsic structure of the magnetic field, e. g., the helix lead angle, but also the performance parameters, e. g., the dimensional ratio of the liquid bulk. The notable opposing roles of these two flow patterns in the improvement of macrosegregations when imposing such magnetic fields near the solidifying front were qualitatively addressed. (C) The Minerals, Metals & Materials Society and ASM International 201

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Model Experiments for Flow Phenomena in Crystal Growth

Dadzis

Pätzold

Gerbeth

2019

Crystal Research and Technology

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The concept of a physical model experiment is introduced and discussed in the context of melt and gas flows in bulk crystal growth processes. Such experiments allow one to "extract" selected physical phenomena from the full complexity of a real crystal growth process and "transfer" them to material systems with an easier access for experimental measurements. Model experiments for the main techniques of melt growth are summarized in a literature review, and the applicability of the results to real crystal growth systems is analyzed. Recent examples of model experiments for melt and gas flows in Czochralski growth of silicon are used to demonstrate the state of the art and show the potential of such experiments to improve the understanding of complex multi-physical multi-scale phenomena occurring in every crystal growth process.

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The sensitivity of a travelling magnetic field driven flow to axial alignment

Cited by 14 publications

References 30 publications

Model experiments and numerical simulations for directional solidification of multicrystalline silicon in a traveling magnetic field

Model experiments and numerical simulations for directional solidification of multicrystalline silicon in a traveling magnetic field

Flow Driven by an Archimedean Helical Permanent Magnetic Field. Part I: Flow Patterns and Their Transitions

Model Experiments for Flow Phenomena in Crystal Growth

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