Dense phase in downer was much more difficult to observe than in riser due to its shorter duration time, smaller size and lower density.
通过比较高密度下行床与高密度提升管内密相特性，发现下行床内的密相因停留时间短、尺寸小和密度低而难以观察到。
It is suitable for dense phase pneumatic transportation, and for dilute density pneumatic conveying as well.
该泵不仅适用于高浓度气力输送，也适用于稀相气力输送。
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