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用非平衡态热力学的分析方法分析了流化床系统的熵、熵产生、熵流，讨论了流化床系统的热力学分支和耗散结构分支，论证了流化床系统的能量最小原则，使热力学第二定律同流化床理论研究有机地相结合。建立了鼓泡流化床的数学模型和过渡态判据。热力学第二定律的引入，使热力学和流体动力学与流化床理论研究、耗散结构分支与系统运动形式的多样性、系统总体稳定与局部非稳定在理论描述上相统一。
The entropy, entropy generation and entropy flow of the fluidized bed system are analyzed by non-equilibrium thermodynamic analysis. The thermodynamic branch and dissipative structure branch of the fluidized bed system are discussed. The minimum energy principle of the fluidized bed system is demonstrated. The second law of thermodynamics is combined organically with fluidized bed theory. The mathematical model of bubbling fluidized bed and the criterion of transition state were established. The introduction of the second law of thermodynamics makes the thermodynamics and fluid dynamics and fluidized bed theory study, the diversity of dissipative structure branches and system motion forms, and the overall system stability and local instability are unified in the theoretical description.