Hydrodynamically driven facet kinetics in crystal growth
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In: Journal of crystal growth, Vol. 584.2022, No. 15 April, 126557, 31.01.2022.
Research output: Contribution to journal › Article › Research › peer-review
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TY - JOUR
T1 - Hydrodynamically driven facet kinetics in crystal growth
AU - Stefan-Kharicha, Mihaela
AU - Kharicha, Abdellah
AU - Zaidat, Kader
AU - Reiss, Georg
AU - Eßl, Werner
AU - Goodwin, Frank
AU - Wu, Menghuai
AU - Ludwig, Andreas
AU - Mugrauer, Claudia
N1 - Publisher Copyright: © 2022
PY - 2022/1/31
Y1 - 2022/1/31
N2 - In this paper we show that the presence of liquid flow around a crystal growing from melt can induce dissymmetry in growth similar to that described by anisotropic interfacial kinetic coefficients. A front tracking interface model based on a cellular automaton approach was applied to the growth of a Fe2Al5 crystal (also known as top dross particle) in a saturated Zn melt at constant temperature. The growth rate was found to be influenced by the intensity of the melt flow and by the direction of the flow with respect to the crystal orientation. The magnitude and the direction of flow modify the diffusion boundary layer, changing the conditions (temperature and concentration) at the facet interface, therefore the mass transfer. We have shown that despite the isotropy of interfacial kinetics, hydrodynamics was able to introduce an anisotropy in the crystal growth similar to the natural anisotropy in interfacial kinetics of the facets. The facets grow rate was found to be strongly dependant on the Reynolds number as well as on the orientation of the crystalline orientation with respect to the flow direction.
AB - In this paper we show that the presence of liquid flow around a crystal growing from melt can induce dissymmetry in growth similar to that described by anisotropic interfacial kinetic coefficients. A front tracking interface model based on a cellular automaton approach was applied to the growth of a Fe2Al5 crystal (also known as top dross particle) in a saturated Zn melt at constant temperature. The growth rate was found to be influenced by the intensity of the melt flow and by the direction of the flow with respect to the crystal orientation. The magnitude and the direction of flow modify the diffusion boundary layer, changing the conditions (temperature and concentration) at the facet interface, therefore the mass transfer. We have shown that despite the isotropy of interfacial kinetics, hydrodynamics was able to introduce an anisotropy in the crystal growth similar to the natural anisotropy in interfacial kinetics of the facets. The facets grow rate was found to be strongly dependant on the Reynolds number as well as on the orientation of the crystalline orientation with respect to the flow direction.
KW - A1. Computer simulation
KW - A1. Convection
KW - A1. Fluid flows
KW - A1. Growth models
KW - A2. Growth from melt
KW - A2. Single crystal growth
UR - http://www.scopus.com/inward/record.url?scp=85123987602&partnerID=8YFLogxK
U2 - 10.1016/j.jcrysgro.2022.126557
DO - 10.1016/j.jcrysgro.2022.126557
M3 - Article
AN - SCOPUS:85123987602
VL - 584.2022
JO - Journal of crystal growth
JF - Journal of crystal growth
SN - 0022-0248
IS - 15 April
M1 - 126557
ER -
