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Title: Viscous fingering in liquid crystals: Anisotropy and morphological transitions
Author: Folch Manzanares, Roger
Casademunt i Viader, Jaume
Hernández Machado, Aurora
Keywords: Dinàmica de fluids
Ciència dels materials
Física de l'estat sòlid
Fluid dynamics
Materials science
Solid state physics
Issue Date: 2000
Publisher: The American Physical Society
Abstract: We show that a minimal model for viscous fingering with a nematic liquid crystal in which anisotropy is considered to enter through two different viscosities in two perpendicular directions can be mapped to a twofold anisotropy in the surface tension. We numerically integrate the dynamics of the resulting problem with the phase-field approach to find and characterize a transition between tip splitting and side branching as a function of both anisotropy and dimensionless surface tension. This anisotropy dependence could explain the experimentally observed (reentrant) transition as temperature and applied pressure are varied. Our observations are also consistent with previous experimental evidence in viscous fingering within an etched cell and simulations of solidification.
Note: Reproducció del document publicat a:
It is part of: Physical Review E, 2000, vol. 61, núm. 6, p. 6632-6638
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ISSN: 1539-3755
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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