Fan, Xianqiang;
Shevchenko, Natalia;
Tonry, Catherine;
Clark, Samuel J;
Atwood, Robert C;
Eckert, Sven;
Pericleous, Koulis;
... Kao, Andrew; + view all
(2023)
Controlling solute channel formation using magnetic fields.
Acta Materialia
, 256
, Article 119107. 10.1016/j.actamat.2023.119107.
(In press).
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Abstract
Solute channel formation introduces compositional and microstructural variations in a range of processes, from metallic alloy solidification, to salt fingers in ocean and water reservoir flows. Applying an external magnetic field interacts with thermoelectric currents at solid/liquid interfaces generating additional flow fields. This thermoelectric (TE) magnetohydrodynamic (TEMHD) effect can impact on solute channel formation, via a mechanism recently drawing increasing attention. To investigate this phenomenon, we combined in situ synchrotron X-ray imaging and Parallel-Cellular-Automata-Lattice-Boltzmann based numerical simulations to study the characteristics of flow and solute transport under TEMHD. Observations suggest the macroscopic TEMHD flow appearing ahead of the solidification front, coupled with the microscopic TEMHD flow arising within the mushy zone are the primary mechanisms controlling plume migration and channel bias. Two TE regimes were revealed, each with distinctive mechanisms that dominate the flow. Further, we show that grain orientation modifies solute flow through anisotropic permeability. These insights led to a proposed strategy for producing solute channel-free solidification using a time-modulated magnetic field.
| Type: | Article |
|---|---|
| Title: | Controlling solute channel formation using magnetic fields |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.actamat.2023.119107 |
| Publisher version: | https://doi.org/10.1016/j.actamat.2023.119107 |
| Language: | English |
| Additional information: | © 2023 The Author(s). Published by Elsevier Ltd on behalf of Acta Materialia Inc. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
| Keywords: | Directional solidification, Solute channel, Magnetic field, Thermoelectric magnetohydrodynamic |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10173124 |
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