Molecular dynamics study of a phase-separating fluid mixture under shear flow

Ryoichi Yamamoto, Xiao C Zeng

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Molecular dynamics simulation is carried out to study domain structures and rheological properties of a two-dimensional phase-separating binary fluid mixture under shear flow. In the early stage of the phase separation, anisotropic composition fluctuations appear immediately after the quench. As the domain grows, the anisotropy in the composition fluctuations increases. The quenched system eventually reaches a dynamical steady state, in which anisotropic domain structures are preserved. In the steady state, the shortest characteristic length scale [Formula Presented] of domains decreases with increasing shear rate [Formula Presented] as [Formula Presented] Stringlike domain structures are observed in the strong shear regime, whereas randomly fluctuating patterns are observed in the weak shear regime. Moreover, the excess viscosity [Formula Presented] is found to decrease with increasing shear rate as [Formula Presented] indicating that the phase-separating fluid mixtures are highly non-Newtonian because of domain deformations.

Original languageEnglish (US)
Pages (from-to)3223-3230
Number of pages8
JournalPhysical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
Volume59
Issue number3
DOIs
StatePublished - Jan 1 1999

Fingerprint

Shear Flow
shear flow
Molecular Dynamics
molecular dynamics
Fluid
fluids
shear
Fluctuations
binary fluids
Decrease
Phase Separation
Length Scale
Molecular Dynamics Simulation
Excess
Immediately
Anisotropy
Viscosity
viscosity
Binary
anisotropy

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Mathematical Physics
  • Condensed Matter Physics
  • Physics and Astronomy(all)

Cite this

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abstract = "Molecular dynamics simulation is carried out to study domain structures and rheological properties of a two-dimensional phase-separating binary fluid mixture under shear flow. In the early stage of the phase separation, anisotropic composition fluctuations appear immediately after the quench. As the domain grows, the anisotropy in the composition fluctuations increases. The quenched system eventually reaches a dynamical steady state, in which anisotropic domain structures are preserved. In the steady state, the shortest characteristic length scale [Formula Presented] of domains decreases with increasing shear rate [Formula Presented] as [Formula Presented] Stringlike domain structures are observed in the strong shear regime, whereas randomly fluctuating patterns are observed in the weak shear regime. Moreover, the excess viscosity [Formula Presented] is found to decrease with increasing shear rate as [Formula Presented] indicating that the phase-separating fluid mixtures are highly non-Newtonian because of domain deformations.",
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AB - Molecular dynamics simulation is carried out to study domain structures and rheological properties of a two-dimensional phase-separating binary fluid mixture under shear flow. In the early stage of the phase separation, anisotropic composition fluctuations appear immediately after the quench. As the domain grows, the anisotropy in the composition fluctuations increases. The quenched system eventually reaches a dynamical steady state, in which anisotropic domain structures are preserved. In the steady state, the shortest characteristic length scale [Formula Presented] of domains decreases with increasing shear rate [Formula Presented] as [Formula Presented] Stringlike domain structures are observed in the strong shear regime, whereas randomly fluctuating patterns are observed in the weak shear regime. Moreover, the excess viscosity [Formula Presented] is found to decrease with increasing shear rate as [Formula Presented] indicating that the phase-separating fluid mixtures are highly non-Newtonian because of domain deformations.

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