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

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

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