Abstract

Phase separation in a complex fluid with lamellar order has been studied in the case of cold thermal fronts propagating diffusively from external walls. The velocity hydrodynamic modes are taken into account by coupling the convection-diffusion equation for the order parameter to a generalized Navier-Stokes equation. The dynamical equations are simulated by implementing a hybrid method based on a lattice Boltzmann algorithm coupled to finite difference schemes. Simulations show that the ordering process occurs with morphologies depending on the speed of the thermal fronts or, equivalently, on the value of the thermal conductivity xi. At large values of xi, as in instantaneous quenching, the system is frozen in entangled configurations at high viscosity while it consists of grains with well-ordered lamellae at low viscosity. By decreasing the value of xi, a regime with very ordered lamellae parallel to the thermal fronts is found. At very low values of xi the preferred orientation is perpendicular to the walls in d = 2, while perpendicular order is lost moving far from the walls in d = 3.

Autore Pugliese

• Lamura Antonio

Tutti gli autori

• G. Gonnella; A. Lamura; A. Tiribocchi

Titolo volume/Rivista

Philosophical transactions - Royal Society. Mathematical, Physical and engineering sciences

Anno di pubblicazione

2011

ISSN

1364-503X

ISBN

Non Disponibile

Numero di citazioni Wos

Nessuna citazione

Ultimo Aggiornamento Citazioni

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Numero di citazioni Scopus

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Settori ERC

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Codici ASJC

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