Journal
INTERNATIONAL JOURNAL OF CAST METALS RESEARCH
Volume 22, Issue 1-4, Pages 147-150Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1179/136404609X367551
Keywords
Dendritic growth; Magnetohydrodynamics; Thermoelectricity; Enthalpy; Undercooling; Binary alloy
Categories
Funding
- EPSRC [EP/K011413/1, EP/D505011/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/D505011/1, EP/K011413/1] Funding Source: researchfish
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The effects of a constant uniform magnetic field on thermoelectric currents during dendritic solidification were investigated using a two-dimensional enthalpy based numerical model. Using an approximation for three-dimensional unconstricted growth, the resulting Lorentz forces generate a circulating flow influencing the solidification pattern. Under the presence of a strong magnetic field secondary growth on the clockwise side of the primary arm of the dendrite was encouraged, whereas the anticlockwise side is suppressed due to a reduction in local free energy. The preferred direction of growth rotated in the clockwise sense under an anticlockwise flow. The tip velocity is significantly increased compared with growth in stagnant flow. This is due to a small recirculation at the tip of the dendrite; bringing in colder liquid and lowering the concentration of solute.
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