Thermodynamics for Non-equilibrium Pattern Formation

Details Thermodynamics for Non-equilibrium Pattern Formation Thermodynamics for Non-equilibrium Pattern Formation

2011-02-10

arxiv.org/abs/1102.2257v1

Physics

Condensed Matter

Statistical Mechanics

Scientific paper

The second entropy theory for non-equilibrium thermodynamics is used to show that the optimum structure or pattern of a time-dependent system corresponds to the maximum entropy. A formula for the total entropy of convective heat flow is derived. The Navier-Stokes equations in Boussinesq approximation for straight roll convection are solved by a Fourier expansion technique. Results for the velocity amplitude are in good agreement with previous computations and experimental measurements. For the spontaneous transitions between straight roll states reported in the literature, it is shown that the measured change in convective pattern wave length corresponds to an increase in the entropy.

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