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研究了空气－水－细铁粉三相磁场流化床在两种气体分布器作用下的床展膨胀特性．结果表明，随着磁场强度的增强，细铁粉流化床层表现为散流区、链流区和磁聚区．气体在液体中的分散形态与气体分布器、气体速度和液体速度有关，表现为鼓泡、鼓泡－节涌和节涌．实验得到了链流区内气体在上述分散形态下的床层膨胀比（）与气速（Ｕｇ）、液速（Ｕｌ）和磁场强度（Ｈ）的经验关联式．关联式如下：
The bed expansion behavior of air-water-fines iron three-phase magnetic field fluidized bed under the action of two gas distributors was studied. The results show that with the increase of magnetic field strength, the fine-grained iron fluidized bed behaves as a diffusing zone, a chain flow zone and a magnetic agglomeration zone. Gas dispersion in liquid form and gas distributor, gas velocity and liquid velocity related to the performance of bubbling, bubbling - Chung and Chung Festival. The experimental correlation between the bed expansion ratio () and the gas velocity (Ug), liquid velocity (Ul) and magnetic field strength (H) of gas in the chain flow region was obtained experimentally. The correlation is as follows: