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arXiv 0904.0791math-phmath.MP
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Vlasov-Boltzmann二元混合物的相变

Phase Transition in a Vlasov-Boltzmann Binary Mixture

R. Esposito, Y. Guo, R. Marra

摘要:

没有多少动力学模型,它是可能的,以证明任何值的努森数的分叉现象。在这里,我们考虑一个二元混合物在一条线上的碰撞和长程排斥相互作用不同的物种。它在足够低的温度下经历偏析相变。对应于混合相的空间均匀麦克斯韦平衡,在高温下最小化自由能,当温度低于临界值时,变为最大值,而对应于共存的分离相的非均匀最小值,出现。我们证明了它们相对于Vlasov-Boltzmann演化是动态稳定的,而均匀平衡变得动态不稳定。

英文摘要:

There are not many kinetic models where it is possible to prove bifurcation phenomena for any value of the Knudsen number. Here we consider a binary mixture over a line with collisions and long range repulsive interaction between different species. It undergoes a segregation phase transition at sufficiently low temperature. The spatially homogeneous Maxwellian equilibrium corresponding to the mixed phase, minimizing the free energy at high temperature, changes into a maximizer when the temperature goes below a critical value, while non homogeneous minimizers, corresponding to coexisting segregated phases, arise. We prove that they are dynamically stable with respect to the Vlasov-Boltzmann evolution, while the homogeneous equilibrium becomes dynamically unstable.

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