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Title: Dynamics of binary mixtures in inhomogeneous temperature
Authors: Giuseppe, Gonnella
Antonio, Lamura
Antonio, Piscitelli
Keywords: DRNTU::Science::Physics
Issue Date: 2008
Source: Gonnella, G., Lamura, A., & Piscitelli, A. (2008). Dynamics of binary mixtures in inhomogeneous temperatures. Journal of physics A - Mathematical and theoretical, 41(10), 105001-.
Series/Report no.: Journal of physics A - Mathematical and theoretical
Abstract: A dynamical description for fluid binary mixtures with variable temperature and concentration gradient contributions to entropy and internal energy is given. By using mass, momentum and energy balance equations together with the standard expression for entropy production, a generalized Gibbs–Duhem relation is obtained which takes into account thermal and concentration gradient contributions. Then an expression for the pressure tensor is derived. As examples of applications, interface behavior and phase separation have been numerically studied in two dimensions neglecting the contributions of the velocity field. In the simplest case with a constant thermal gradient, the growth exponent for the averaged size of domains is found to have the usual value z = 1/3 and the domains appear elongated in the direction of the thermal gradient. When the system is quenched by contact with external walls, the evolution of temperature profiles in the system is shown and the domain morphology is characterized by interfaces perpendicular to the thermal gradient.
Rights: © 2008 IOP Publishing Ltd.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:SPMS Journal Articles

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