In addition, flow pattern of catalyst in gasoline riser has been studied and the result shows that gas solid contact in the riser was in the form of dense phase force transfer.
通过对汽油提升管内催化剂流动形式的分析，提升管内气固接触形式为密相气力输送。
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。
Calculation results can provide some references to safe and effective well control and investigation of gas-liquid two-phase flow in vertical riser.
计算结果为安全有效地井控及垂直上升管内气液两相流的研究提供一定的参考依据。
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