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Crystal growth in fluid flow: Nonlinear response effects

Peng, H. L. and Herlach, D.M. and Voigtmann, Th. (2017) Crystal growth in fluid flow: Nonlinear response effects. Physical Review Materials, 1, 030401. American Physical Society. doi: 10.1103/PhysRevMaterials.1.030401. ISSN 2475-9953.

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We investigate crystal-growth kinetics in the presence of strong shear flow in the liquid, using molecular-dynamics simulations of a binary-alloy model. Close to the equilibrium melting point, shear flow always suppresses the growth of the crystal-liquid interface. For lower temperatures, we find that the growth velocity of the crystal depends nonmonotonically on the shear rate. Slow enough flow enhances the crystal growth, due to an increased particle mobility in the liquid. Stronger flow causes a growth regime that is nearly temperature-independent, in striking contrast to what one expects from the thermodynamic and equilibrium kinetic properties of the system, which both depend strongly on temperature. We rationalize these effects of flow on crystal growth as resulting from the nonlinear response of the fluid to strong shearing forces.

Item URL in elib:https://elib.dlr.de/113944/
Document Type:Article
Title:Crystal growth in fluid flow: Nonlinear response effects
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Peng, H. L.hailong.peng (at) dlr.deUNSPECIFIED
Voigtmann, Th.thomas.voigtmann (at) dlr.deUNSPECIFIED
Journal or Publication Title:Physical Review Materials
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1103/PhysRevMaterials.1.030401
Page Range:030401
Publisher:American Physical Society
Keywords:crystallization, crystal growth, shear flow
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Research under Space Conditions
DLR - Research theme (Project):R - Material Design and New Materials
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Voigtmann, Dr.rer.nat. Thomas
Deposited On:18 Sep 2017 12:59
Last Modified:06 Sep 2019 14:49

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