The single bubble behavior in a 3 mm rectangular gas–liquid–solid mini-fluidized bed with 90 μm particles was simulated using the combination of VOF and DEM, and the results were validated by experiments. The simulation on the expansion of liquid–solid mini-fluidized shows that the profiles of liquid and particle velocities are consistent, and both become more concentrated as the expansion ratio decreases. The bubble formation size does not change with the increase of the solid holdup from 0.25 to 0.45, while the bubble rise velocity becomes lower. The upward liquid velocity in the bubble wake exceeds 50% of the instantaneous bubble velocity. The size of the low particle concentration bubble wake reducing with the increase of solid holdup can be attributed to the decrease in the bubble rise velocity and the enhancement in the inertia effect of the liquid–solid flow.

使用VOF和DEM的组合模拟了在3 mm矩形的90 mm气-液-固微型矩形流化床中的单气泡行为，并通过实验验证了结果。对液-固微流化膨胀的模拟表明，液体和颗粒速度的分布是一致的，并且随着膨胀率的降低两者都变得更加集中。气泡形成的尺寸不会随着固体滞留量的增加而从0.25增加到0.45，而气泡的上升速度会降低。气泡尾流中向上的液体速度超过瞬时气泡速度的50％。