A composite tridimensional rotational flow sieve tray (CTRST) is proposed. The flow patterns of CTRST were visually categorized, combined with the standard deviation of the pressure difference. In the TRST area of the internal packing-type tray, the membrane-drip column and foam-embolic flow is present, while bubbly and milk froth-ribbon flow is present in the packing area of the external packing-type tray. The effect of the tray structure parameters on the pressure drop under co-current flow was investigated. The dry and wet pressure drop is within 160 and 900 Pa, respectively. Under the same structural parameters, the pressure drop of the internal packing-type tray was higher than that of the external packing-type tray. The flow characteristics of the standard tray under the countercurrent flow were compared. The CTRST was found to be more suitable for co-current flow. A prediction model pressure drop under co-current was established with an error of 15.5%.

中文翻译：

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气液并流下复合立体旋流筛板的流态与压降

提出了一种复合立体旋流筛板（CTRST）。结合压力差的标准偏差对CTRST的流型进行视觉分类。内填料式塔盘的TRST区存在膜滴流和泡沫栓塞流，外填料式塔盘填料区存在气泡和奶泡-带状流。研究了塔板结构参数对顺流下压降的影响。干湿压降分别在 160 和 900 Pa 以内。在结构参数相同的情况下，内填料式塔板的压降高于外填料式塔板。比较了逆流下标准塔板的流动特性。CTRST被发现更适合并流。建立并流压降预测模型，误差为15.5%。