Gas-viscous liquid bubbly and slug flow are very common in petroleum, chemical, bioengineering, polymer, and food processing. However, there is a major knowledge gap in two-phase flow research in the design of gas injectors/distributers in very high viscosity oil systems. The present study investigates the effect of gas injection methods in columns containing very high viscosity oils (i.e., realistic liquids), and more specifically using 360 Pa · s viscosity oil in a 240-mm diameter column. The effects that the radial positioning, number of gas nozzles, and their distance from each other have on the structure of the flow in viscous liquids are presented in detail. Electrical capacitance tomography (ECT) is used to extract experimental data. Void fraction, bubble velocity, frequency, liquid film thickness, and bubble length were measured and analyzed at different radial gas injection positions. It has been observed that bubble length increases significantly by 0.3 m when the injection nozzle is located next to the wall of the pipe. Bubble velocity and length also increase by 0.217 m/s and 3.6 m, respectively, with increasing gas flowrate when multiple injection points are used. Increasing the distance between the gas injection points increased bubbles' length by 1.2 m. Bubbles' velocity and frequency (at higher gas flow rate) were also increased.

中文翻译：

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注气配置对高粘度油柱流动特性影响的实验研究

气体粘性液体气泡和团状流在石油、化学、生物工程、聚合物和食品加工中非常常见。然而，在非常高粘度油系统中的气体喷射器/分配器的设计中，两相流研究存在重大的知识空白。本研究调查了气体注入方法在含有非常高粘度油（即实际液体）的柱中的效果，更具体地说，在 240 毫米直径的柱中使用 360 Pa·s 粘度的油。详细介绍了径向定位、气体喷嘴的数量以及它们之间的距离对粘性液体流动结构的影响。电容断层扫描 (ECT) 用于提取实验数据。空隙率、气泡速度、频率、液膜厚度、在不同的径向注气位置测量和分析气泡长度。据观察，当喷嘴靠近管壁时，气泡长度显着增加了 0.3 m。当使用多个注入点时，随着气体流量的增加，气泡速度和长度也分别增加了 0.217 m/s 和 3.6 m。增加气体注入点之间的距离会使气泡的长度增加 1.2 m。气泡的速度和频率（在较高的气体流速下）也增加了。当使用多个注入点时，随着气体流量的增加。增加气体注入点之间的距离会使气泡的长度增加 1.2 m。气泡的速度和频率（在较高的气体流速下）也增加了。当使用多个注入点时，随着气体流量的增加。增加气体注入点之间的距离会使气泡的长度增加 1.2 m。气泡的速度和频率（在较高的气体流速下）也增加了。