According to fluidization and bond laws for type D particles

the processes from normal fluidization to shut-down controlled by solid-bridge force were investigated by experiment.Near-wall wind and spiral wind were used to improve the bond behavior of coarse cohesive particles in fluidization process.S attractor comparison method was adopted to evaluate various measures.The results showed that both near-wall wind and spiral wind could improve particle bond behavior in total

slowing down bond evolution and decreasing bond effect.Near-wall wind could delay the happening of fluidization abnormalities while spiral wind could bring forward the happening of fluidization abnormalities.S value reflected the bond effect and bond evolution well in various cases

so it could be used as a criterion of fluidization quality in fluidized processes.