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https://hdl.handle.net/2142/18868
Description
Title
Asymptotic behavior in spinodal decomposition
Author(s)
Shinozaki, Aritomo
Issue Date
1993-10
Doctoral Committee Chair(s)
Oono, Yoshitsugu
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
kinetics
spinodal decomposition
computational physics
semi-analytical
Cell Dynamical System (CDS)
Asymptotic
Language
en
Abstract
"In this Thesis, we study the kinetics of systems undergoing spinodal decomposition,
using computational and semi-analytical methods. We use a Cell Dynamical System
(CDS) to build effective computational models of spinodal decomposition in a large
3-space isotropic ideal binary alloy system and a well matched binary fluid system.
Use of a CDS allows us to greatly increase the size of system we may study and allows
us to reach late stages of development.
At late times, the coarsening spinodal decomposition pattern appears to have a
statistically similar structure independent of the time. This gives rise to simple scaling
arguments for quantities such as the scattering form factor which are motivated
by analogies to critical phenomena. We study the nature of scaling for the observable
scattering form factor in the late, but pre-asymptotic regime using a simple ""hardening""
analysis. From this, we extract out the best available information on the true
asymptotic behavior of spinodal decomposition at critical composition for the binary
alloy and binary fluid case.
Next, we study a simpler problem which give us insight into the late but preasymptotic
growth law in the binary alloy and binary fluid system at critical composition.
Using the equilibrium kink solution of the binary alloy and binary fluid
model, we study the dispersion relation, or relaxation rate, of small perturbations of
the kink or wall solution. We find that the relaxation rate depends on the wavevector
of the perturbation. This gives rise to a growth law for the binary alloy and binary
fluid system. These growth laws demonstrate the crossover to the asymptotic growth
exponents as predicted by dimensional analysis, and a subtle effect in the binary
111
fluid model which appears to lead to computationally demonstrable but unexpected
behavior."
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