본 연구에서는 고-액유동층에 원통형금망을 충전시켜 유동층의 높이에 따른 농도의 변화를 고찰함으로써 분산모델의 성립여부를 규명하였다. 연구결과에 의하면 충전물이 있을 때는 분산모델이 성립하며 그때의 축방향분산계수는 유동층확장（fluidization bed expansion）과 다음과 같은 관계식이 있음을 알았다.
D（cm²/sec）=4.2(V/V_mf-1)^2.1

In this investigation, the longitudinal mixing in a liquid-solid fluidized bed packed with screen cylinders were studied and compared with an unpacked bed. The experiments were carried out by employing a tracer method ; the fluidized solids and the tracer were monazite and magnetite sands, respectively. The result showed that the dispersion model could be applied for the packed fluidized bed, whereas the model could not be applied for the unpacked fluidized bed, and the relationship between the longitudinal dispersion coefficient in the packed bed and the expansion of the bed is given by the following equation :
D（cm²/sec）=4.2(V/V_mf-1)^2.1