They also impede backmixing of sand.
同时也可防止砂子的返混。
The RTD measured in a four—stage experimental equipment, and the backmixing rate is estimated.
在四段实验设备内测定了停留时间分布，并估算出段间返混流率。
Experimental results indicate that the extents of axial gas backmixing are related the gas velocity.
实验结果表明湍动床存在着明显的轴向返混，轴向扩散系数与气速有关。
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