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arXiv 1602.05696math.AP
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能量-反应-扩散系统的平衡态衰减

Decay to equilibrium for energy-reaction-diffusion systems

Jan Haskovec, Sabine Hittmeir, Peter Markowich, Alexander Mielke

摘要:

我们导出了耦合到热方程的反应扩散方程的相容模型。当总能量守恒时,总熵作为驱动泛函,使得完全耦合系统是梯度流。该方法的新颖之处是Onsager结构,这是一个梯度系统的对偶形式,以及在密度和内能方面的制定。在这些变量中,可以假设熵密度是严格凹的,使得在给定总能量的线性约束和适当的密度约束的情况下,存在唯一的最大化者(熵平衡)。我们考虑两个特殊的系统,这种类型,即,扩散反应双极能量传输系统,和漂移扩散反应能量传输系统与限制电位。我们证明了相应的熵-熵产生不等式,并利用Cziszar-Kullback-Pinsker型不等式,首先在熵中,进一步在$L^1$中建立了到平衡点的收敛性.

英文摘要:

We derive thermodynamically consistent models of reaction-diffusion equations coupled to a heat equation. While the total energy is conserved, the total entropy serves as a driving functional such that the full coupled system is a gradient flow. The novelty of the approach is the Onsager structure, which is the dual form of a gradient system, and the formulation in terms of the densities and the internal energy. In these variables it is possible to assume that the entropy density is strictly concave such that there is a unique maximizer (thermodynamical equilibrium) given linear constraints on the total energy and suitable density constraints. We consider two particular systems of this type, namely, a diffusion-reaction bipolar energy transport system, and a drift-diffusion-reaction energy transport system with confining potential. We prove corresponding entropy-entropy production inequalities with explicitely calculable constants and establish the convergence to thermodynamical equilibrium, at first in entropy and further in $L^1$ using Cziszar-Kullback-Pinsker type inequalities.

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