The fluidization behavior of group C powder in an axial uniform magnetic field has been studied.Experiments demonstrate that channels and bubbles can be eliminated effectively.Two optica1 fiber probes are used to measure the size of bubble in the bed and the bubble size decreases with increasing magnetic field intensity and magnetic powder fraction.The length of"chain"

obtained by using CA5300 board and modular system

is found to be strongly influenced by the magnetic field intensity.Experimental data are in agreement with that of calculated results from the mathematical model.