Fluiddynamics and Mass Transfer of Single Particles and Swarms of Particles in Extraction Columns
Fluiddynamics and Mass Transfer of Single Particles and Swarms of Particles in Extraction Columns
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萃取塔中单个颗粒和颗粒群的流体动力学和传质
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
Daniel Garthe
中科院分区：
文献类型：
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作者：
Daniel Garthe
时至今日，液体/液体萃取柱只能通过使用原始流体的中试装置柱的初步试验可靠地确定尺寸。这种方法的缺点是需要大量的液体，而这些液体往往难以提供。因此，化学工业的目标是开发新的尺寸标注技术。为了实现这一目标，人们的注意力转向了对萃取柱中单个颗粒（滴和刚性球体）基本行为的研究。这项工作的主要目的是研究柱内装置如筛盘、结构填料或搅拌器对速度、破碎机制和单滴传质率的影响。当单个液滴的基本行为被正确理解后，必须研究一群液滴的相互作用以进行精确的放大。因此，研究了不同萃取器中液滴群的流体动力学和传质速率，并提出了一个新的模型来预测滞留对液滴群运动的影响。
To this day a liquid/liquid-extraction column can be reliably dimensioned only from preliminary tests in pilot plant columns using the original fluids. The disadvantage of this procedure is that large quantities of fluids are necessary which are often difficult to provide. For this reason, the aim of the chemical industry is to develop new dimensioning techniques. To achieve this goal, attention has turned to the investigation of the fundamental behaviour of single particles (drops and rigid spheres) in extraction columns. The main objective of this work is the investigation of the influence of column internals such as sieve trays, structured packings or agitators on the velocities, the breakage mechanisms and the mass transfer rates of single drops. When the fundamental behaviour of single drops is properly understood, the interactions of drops in a swarm have to be studied for an accurate scale-up. Thus, fluiddynamics and mass transfer rates of swarms of drops in different extractors are examined and a new model to predict the hold-up influence on the motion of a swarm is presented.