液-固流态化系统固体颗粒特性研究(1):颗粒的初始流态化速度v_(mf)

为数众多的计算颗粒初始流态化速度的公式大体上分为三类:第一类以Ergun公式为基础,引入经验系数加以修正;第二类以某种流体力学关系为基础;第三类属于纯经验公式。这三种类型中,以第一类式子有较大范围之Ar适应性,比较适用。本文提出的计算式子也属于Ergun型,从目前掌握的实验数据看来,比工程界广泛应用的Wen and Yu式子用于计算液-固流态化系统有更高的精确性,而且对球形与非球形颗粒都适用。

Particle characteristics in a solid-liquid fluidization system(1): incipient fluidization velocity of particles v_(mf)

A lot of existing equations for calculating the incipient fluidization velocity of particles v_(mf) in a liquid-solid system falls into three categories.The first is based on the Ergun equation.The second is based on some other type of fluid dynamics,and the third is pure empirical.Judging by experimental data,the first category can be used in a wider range of Ar or Remf numbers.An equation proposed for a solid-liquid fluidization system is of the Ergun type.However it has a higher accuracy over a wide range of Ar or Remf numbers,and has a unified form for spherical and non-spherical particles.