Phase separation of viscous ternary liquid mixtures

Title
Phase separation of viscous ternary liquid mixtures
Author(s)
박장민Roberto Mauri[Roberto Mauri]Patrick Anderson[Patrick Anderson]
Keywords
SPINODAL DECOMPOSITION; NONUNIFORM SYSTEM; PMMA/SAN BLENDS; BINARY-MIXTURES; POLYMER BLENDS; FREE ENERGY; SEGREGATION; NUCLEATION; ALLOYS; FLUIDS
Issue Date
201210
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
CHEMICAL ENGINEERING SCIENCE, v.80, pp.270 - 278
Abstract
In this work we study the demixing of ternary liquid mixtures, following an initial quench to an unstable state of their phase diagram. 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. 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 small. Two examples are presented, describing the phase separation of ternary mixtures in two and three phases, respectively. In the first case, as expected, we see that the growth of the domain size follows the well known diffusion-driven scaling, R(t)proportional to t(1/3). On the other hand, in the second example, the domain size growth follows the usual t(1/3) scaling only until the symmetry among the three phases breaks down and the domain size of two of the three phases decrease sharply. After that point, the morphology of the system becomes more regular, almost crystal-like, and the three phases start to grow again, with the same growth rate R(t) proportional to t(n), with n=0.11. (C) 2012 Elsevier Ltd. All rights reserved.
URI
http://hdl.handle.net/YU.REPOSITORY/27128http://dx.doi.org/10.1016/j.ces.2012.06.017
ISSN
0009-2509
Appears in Collections:
공과대학 > 기계공학부 > Articles
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE