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Axial and Radial Investigation of Hydrodynamics in a Bubble Column;Influence of Fluids Flow Rates and Sparger Type

机译：鼓泡塔流体动力学的轴向和径向研究；流体流速和分布器类型的影响

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A detailed investigation of local hydrodynamics in a pilot plant bubble column has been performed using various techniques, exploring both axial and radial variationsudof the gas hold-up, bubble average diameter and frequency, surface area. A wide range of operating conditions has been explored up to large gas and liquidudflow rates, with two sparger types. Two main complementary techniques were used: a quasi local measurement of gas hold-up via series of differential pressureudsensors to get the axial variation and a double optic probe giving radial variations of gad hold-up, bubble average size and frequency and surface area.udAccording to axial evolutions, three zones, where radial evolutions have been detailed,have been separated: at the bottom the gas injection zone, the large central region or column bulk and the disengagement zone at the column top. It was found that significant axial and radial variations of the two phase flow characteristicsuddo exist even in the so called homogeneous regime. The normalized profiles of bubble frequency appear sparger and gas velocity independent contrary to bubbleuddiameter, gas hold-up and interfacial area normalized profiles. In any case bubbles are larger in the sparger zone than elsewhere.udThe main result of this work is the very strong effect of liquid flow on bubble columnudhydrodynamics at low gas flow rate. First the flow regime map observed in batch mode is dramatically modified with a drastic reduction of the homogeneousudregime region, up to a complete heterogeneous regime in the working conditions (uG> 0.02 m/s). On the contrary, liquid flow has limited effects at very high gasudflow rates. A large data bank is provided to be used for example in detailed comparison withudCFD calculations.
机译：已使用多种技术对中试装置鼓泡塔中的局部流体动力学进行了详细研究，探索了气体滞留量的轴向和径向变化，气泡平均直径和频率，表面积。在两种气体分布器类型的情况下，已经探究了大范围的工作条件，直至达到大的气体和液体/溢流速率。使用了两种主要的互补技术：通过一系列差压 udsensor对气体滞留率进行准局部测量以获取轴向变化，以及使用双光学探头提供对气体滞留率，气泡平均大小，频率和表面积的径向变化根据轴向演变，已经划分了三个区域，其中详细描述了径向演变：在底部是注气区，较大的中央区域或色谱柱体积，在色谱柱的顶部是分离区。已经发现，即使在所谓的均质状态下，两相流动特性的径向和径向变化也存在。与气泡直径，气体滞留率和界面面积归一化分布图相反，气泡频率的归一化分布图看起来独立于喷头和气体速度。在任何情况下，喷雾器区域中的气泡都比其他区域大。 ud该工作的主要结果是在低气体流速下，液体流量对气泡塔 udhydrodynamics的影响非常强。首先，在批量模式下观察到的流态图被显着修改，同时均质 udregime区域急剧减小，直至在工作条件下达到完全异质状态（uG> 0.02 m / s）。相反，液体流在非常高的气体/流速下的作用有限。提供了一个大型数据库，例如可与 udCFD计算进行详细比较。

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