2026-04-13T02:02:08Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/187392025-12-05T16:38:01Zcom_2072_1057col_2072_478823col_2072_478917

00925njm 22002777a 4500 dc Folch Manzanares, Roger author Casademunt i Viader, Jaume author Hernández Machado, Aurora author 2011-07-07T12:51:40Z 2011-07-07T12:51:40Z 2000 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. Dinàmica de fluids Cristal·lografia Ciència dels materials Física de l'estat sòlid Fluid dynamics Crystallography Materials science Solid state physics Viscous fingering in liquid crystals: Anisotropy and morphological transitions