Flow pattern and water holdup measurements of vertical upward oil-water two-phase flow in small diameter pipes
Flow pattern and water holdup measurements of vertical upward oil-water two-phase flow in small diameter pipes
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小口径管道垂直向上油水两相流流型及持水率测量
DOI：
10.1016/j.ijmultiphaseflow.2012.01.007
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发表时间：
2012-05-01
影响因子：
3.8
通讯作者：
Zhai, Lu-Sheng
中科院分区：
文献类型：
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作者：
Du, Meng;Jin, Ning-De;Zhai, Lu-Sheng
对内径为20 mm的垂直上升管内油水两相流进行了实验研究。我们首先使用垂直多电极阵列电导传感器测量持水率，并使用微型电导探针定义了五种观察到的流型，即，极细分散水包油（VFD O/W）流、分散水包油（D O/W）流、水包油段塞流（D OS/W）流、油包水（D W/O）流和过渡流（IF）。在此基础上，给出了油、水表观速度分别为0.258 ~ 3.684 m/s和0.184 ~ 1.474 m/s时的实验流型图。此外，我们得到的流型转变边界的持水率。最后，我们提出了一种有效的二次时频表示，即，自适应最优核时频表示（AOK TFR）研究垂直向上油水两相流的复杂行为。特别地，我们提取总能量和时频熵来表征流型的演化。结果表明，基于AOK TFR的方法可能是一个强有力的工具，用于表征不同的垂直向上的水为主的油水流动模式的动力学特征。(C)2012爱思唯尔有限公司版权所有。
We experimentally investigate vertical upward oil-water two-phase flow in a 20 mm inner diameter pipe. We first using vertical multiple electrode array conductance sensor measure the water holdup, and using mini-conductance probes define five observed flow patterns, i.e., very fine dispersed oil-in-water (VFD O/W) flow, dispersed oil-in-water (D O/W) flow, oil-in-water slug (D OS/W) flow, water-in-oil (D W/O) and transition flow (IF). Then we present an experimental flow pattern map with oil and water superficial velocity ranging from 0.258 m/s to 3.684 m/s and 0.184 m/s to 1.474 m/s, respectively. In addition, we obtain the flow pattern transition boundaries in terms of water holdup. Finally, we propose an effective quadric time-frequency representation, i.e., the adaptive optimal kernel time-frequency representation (AOK TFR) to investigate the complex behavior underlying vertical upward oil-water flow. In particular, we extract total energy and time-frequency entropy to characterize the evolutions of flow patterns. The results suggest that AOK TFR based method could potentially be a powerful tool for characterizing the dynamical characteristics of different vertical upward water-dominant oil-water flow patterns. (C) 2012 Elsevier Ltd. All rights reserved.