The material layer stacking height has less impact on critical fluidization airflow. When the material layer thickness increases, the material layer resistance is increased significantly. When the equivalent average particle size of the material  Layers increases, the critical fluidization airflow increases. When the particle size density of the material  Layers increases, the critical fluidization airflow increases.
Impact on fluid physical properties: When the fluid movement viscosity increases, the critical fluidization airflow decreases. When the temperature of the material layer increase,  the critical fluidization airflow decreases significantly, under the thermal state of the critical fluidization airflow is about a 1/4 -1/5 of the cold state.       (lsh)