The phase separation process which follows a sudden quench inside the coexistence region is considered for a binary fluid subjected to an applied shear flow. This issue is studied in the framework of the convection-diffusion equation based on a Ginzburg-Landau free energy functional in the approximation scheme introduced by Bray and Humayun [Plays. Rev. Lett. 68, 1559 (1992)]. After an early stage where domains furin and shear effects become effective the system enters a scaling regime where the typical domains sizes L-parallel to, L-perpendicular to along the flow and perpendicular to it grow as t(5/4) and t(1/4). The structure factor is characterized by the existence of four peaks, similarly to previous theoretical and experimental observations, and by exponential tails at large wavevectors.
The segregation of sheared binary fluids in the Bray-Humayun model
A Lamura;
2001
Abstract
The phase separation process which follows a sudden quench inside the coexistence region is considered for a binary fluid subjected to an applied shear flow. This issue is studied in the framework of the convection-diffusion equation based on a Ginzburg-Landau free energy functional in the approximation scheme introduced by Bray and Humayun [Plays. Rev. Lett. 68, 1559 (1992)]. After an early stage where domains furin and shear effects become effective the system enters a scaling regime where the typical domains sizes L-parallel to, L-perpendicular to along the flow and perpendicular to it grow as t(5/4) and t(1/4). The structure factor is characterized by the existence of four peaks, similarly to previous theoretical and experimental observations, and by exponential tails at large wavevectors.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
