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本文评述在层流状态下流膜中颗粒的松散与分层过程。颗粒的主要运动形式是推移质运动,参与颗粒松散的力是重力和剪切分散压。当剪切界面上的分散压与床层颗粒有效重力的垂直分力相平衡时,该界面上的颗粒就能松散。运用剪切松散理论可推导出床层颗粒的浓度分布。指出应以单位床面上粒群的总有效重量来计算重力,而不应以单个颗粒横断面上的有效电量来计算,后者导致错误的结论。
This paper reviews the loosening and delamination of particles in a fluidized bed under laminar flow conditions. Particle movement is the main push mass movement, loose particles involved in the force is gravity and shear dispersion pressure. When the dispersion pressure at the shear interface is in equilibrium with the vertical component of the effective gravitational force of the bed particles, the particles at the interface are loosened. Using the theory of shear loosening, the concentration distribution of bed particles can be deduced. It states that gravity should be calculated as the total effective weight of the population of particles on the bed of a unit, not on the effective power in the cross section of a single particle, which leads to erroneous conclusions.