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DY: Dynamik und Statistische Physik
DY 34: Poster
DY 34.112: Poster
Monday, March 7, 2005, 15:30–18:00, Poster TU D
Spinodal decomposition in a three-dimensional Lennard-Jones fluid: A molecular dynamics study — •Hendrik Kabrede and Reinhard Hentschke — Fachbereich Mathematik und Naturwissenschaften, Bergische Universität, Wuppertal
Spinodal decomposition in a three-dimensional Lennard-Jones fluid with one million particles is studied via molecular dynamics. The large size allows the system to decompose into domains with different densities and clearly distinguishable domain boundaries. The atomistic description makes it possible to study relevant physical quantities like the Ginzburg-Landau free energy, the underlying density field, and velocity field on a coarse grained scale. We show that over a wide time range there is no directed velocity field. Thus, such a field is irrelevant for the phase separation description in the analyzed time range. The pair correlation function and the structure factor show scaling behavior over a wide time range. The asymptotic structure factor obeys the predicted power laws, and the domain growth follows t1/2.