Zhao, Rijie, Gao, Jianrong, Kao, Andrew ORCID: 0000-0002-6430-2134 and Pericleous, Koulis ORCID: 0000-0002-7426-9999 (2019) Verification of thermoelectric magnetohydrodynamic flow effects on dendritic tip kinetics by in-situ observations. International Journal of Heat and Mass Transfer, 136. p. 1139. ISSN 0017-9310 (doi:https://doi.org/10.1016/j.ijheatmasstransfer.2019.03.055)

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Abstract

Magnetohydrodynamic flows can be driven by Lorentz forces acting on thermoelectric currents. Their effects on tip velocities of Pd dendrites solidifying from an undercooled melt under magnetic field intensities of up to 6 T were investigated by in-situ observations using a high-speed camera. At low undercoolings, the tip velocities are depressed by magnetic fields of low and high intensities, but recover under an intermediate magnetic field intensity. At high undercoolings, the tip velocities are also depressed, but their recovery is shifted to a higher magnetic field intensity. These observations on Pd dendrites support and extend the findings obtained in previous studies on Ni and Fe dendrites, and fully verify the convection effects on dendritic growth due to three thermoelectric magnetohydrodynamic flow patterns as predicted in recent numerical simulations.

Item Type:	Article
Uncontrolled Keywords:	Dendrites; magnetic fields; tip velocities; thermoelectric magnetohydrodynamic flows; in-situ observations
Subjects:	Q Science > QA Mathematics
Faculty / School / Research Centre / Research Group:	Faculty of Engineering & Science > Centre for Numerical Modelling & Process Analysis (CNMPA) Faculty of Engineering & Science > Centre for Numerical Modelling & Process Analysis (CNMPA) > Computational Science & Engineering Group (CSEG) Faculty of Engineering & Science > School of Computing & Mathematical Sciences (CMS) Faculty of Engineering & Science
Last Modified:	04 Mar 2022 13:06
URI:	http://gala.gre.ac.uk/id/eprint/23193

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