In this work we study the demixing of ternary liquid mixtures. Our theoretical model follows the standard diffuse interface model, where convection and diffusion are coupled via a body force, expressing the tendency of the mixture to minimize its free energy. This driving force induces a material flux which, in most cases, is much larger than that due to pure molecular diffusion. In fact, here we model the behavior of a very viscous polymer melt, so that the Peclet number, expressing the ratio between convective and diffusive mass fluxes, is equal to 50. To simulate the system, the already existent TFEM code was extended to three component systems. Two examples are presented, with known free energy expressions, to describe the behavior of partially miscible three phase mixtures.
Morphology of Phase Separating Ternary Liquid Mixtures
MAURI, ROBERTO;
2012-01-01
Abstract
In this work we study the demixing of ternary liquid mixtures. Our theoretical model follows the standard diffuse interface model, where convection and diffusion are coupled via a body force, expressing the tendency of the mixture to minimize its free energy. This driving force induces a material flux which, in most cases, is much larger than that due to pure molecular diffusion. In fact, here we model the behavior of a very viscous polymer melt, so that the Peclet number, expressing the ratio between convective and diffusive mass fluxes, is equal to 50. To simulate the system, the already existent TFEM code was extended to three component systems. Two examples are presented, with known free energy expressions, to describe the behavior of partially miscible three phase mixtures.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
