Lattice Boltzmann study of the effect of stirring on the migration rate of curved interfaces in binary slurries

Rongshan Qin, Yonghao Zhang

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Morphological evolution of particles in semisolid slurries has been modeled as the migration of a double-peak shape solid-liquid interface. The valley between the peaks represents the solute-trapping area between the dendrite arms. Various boundary shear conditions were considered to mimic the real processing environments. A lattice Boltzmann model for isothermal miscible binary flows has been utilized to handle the hydrodynamics and chemical diffusion. Fixed solute concentration at the solid-liquid interface was introduced to simulate the steady growth of the solid particle. Numerical simulations reveal that shearing the slurries in a direction perpendicular to the growth direction of the particle tips encourages dendrite growth, which agrees with the theoretical prediction based on interface stability analysis. Shearing the boundary along a direction parallel to the growth direction of the particle tips, however, caused a larger increment in the migration rate of the interface in the valley, and is considered the major reason for dendrite-rosette morphological transformation.
Original languageEnglish
Pages (from-to)929-933
Number of pages4
JournalComputers and Fluids
Volume35
Issue number8-9
DOIs
Publication statusPublished - 2006

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Slurries
Shearing
Liquids
Hydrodynamics
Computer simulation
Processing

Keywords

  • fluid dynamics
  • liquid solid interface
  • dendritic structure
  • Semi solid state
  • Boltzmann equation
  • solidification
  • digital simulation
  • modelling
  • computational fluid dynamics
  • lattice model
  • mesoscopic systems
  • microstructure

Cite this

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title = "Lattice Boltzmann study of the effect of stirring on the migration rate of curved interfaces in binary slurries",
abstract = "Morphological evolution of particles in semisolid slurries has been modeled as the migration of a double-peak shape solid-liquid interface. The valley between the peaks represents the solute-trapping area between the dendrite arms. Various boundary shear conditions were considered to mimic the real processing environments. A lattice Boltzmann model for isothermal miscible binary flows has been utilized to handle the hydrodynamics and chemical diffusion. Fixed solute concentration at the solid-liquid interface was introduced to simulate the steady growth of the solid particle. Numerical simulations reveal that shearing the slurries in a direction perpendicular to the growth direction of the particle tips encourages dendrite growth, which agrees with the theoretical prediction based on interface stability analysis. Shearing the boundary along a direction parallel to the growth direction of the particle tips, however, caused a larger increment in the migration rate of the interface in the valley, and is considered the major reason for dendrite-rosette morphological transformation.",
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author = "Rongshan Qin and Yonghao Zhang",
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Lattice Boltzmann study of the effect of stirring on the migration rate of curved interfaces in binary slurries. / Qin, Rongshan; Zhang, Yonghao.

In: Computers and Fluids, Vol. 35, No. 8-9, 2006, p. 929-933.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Lattice Boltzmann study of the effect of stirring on the migration rate of curved interfaces in binary slurries

AU - Qin, Rongshan

AU - Zhang, Yonghao

PY - 2006

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KW - fluid dynamics

KW - liquid solid interface

KW - dendritic structure

KW - Semi solid state

KW - Boltzmann equation

KW - solidification

KW - digital simulation

KW - modelling

KW - computational fluid dynamics

KW - lattice model

KW - mesoscopic systems

KW - microstructure

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