摘要
基于非平衡统计热力学理论分析了扩散对化学反应速率的影响,并结合一个具体的反应模型(A+B>C+D,B+C(?)2B)研究了非均匀性对CSTR条件下体系多重态行为的影响。通过考虑扩散和搅拌之间的联系,引入了一参数P用以定性地描述体系的非均匀程度.研究的结果表明,非均匀性不仅能改变双稳区的范围,而且在一定条件下能引发非平衡相变.这与最近发现的搅拌可影响化学反应系统动力学行为的实验现象是定性一致的。
Based on the theory of nonequilibrium statistical thermodynamics, the effects of diffusion and inhompgeneities on the chemical reaction rates and multiple steady state behaviors are studied for the chemical reaction model which involves three bimolecular steps (A+B C+D, B+C 2B) under CSTR conditions. By considering the relation between diffusing and stirring, a parameter P is introduced to characterize qualitatively the extent of inhomogeneity of ststem. Our results show that inhomogeneities can not only change the range of bistable region but also, under some proper conditions, induce nonequilibrium transitions. These are qualitatively similar to the effects of stirring on the dynamical behaviors of chemical reaction systems which have been found experimently in recent years.
