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首页> 外文会议>AIChE Annual Meeting >Comparison of Breakup Kernels in the CFD-PBM Simulation of a Pulsed Disc and Doughnut Column
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Comparison of Breakup Kernels in the CFD-PBM Simulation of a Pulsed Disc and Doughnut Column

机译：脉冲盘和甜甜圈柱CFD-PBM模拟中分手核的比较

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Liquid-Liquid flow is a commonly found chemical engineering process where one liquid phase is dispersed as droplets in the other phase to enhance mixing Solvent extraction, as a typical example of liquid-liquid flow, has been used in hydrometallurgy, environmental engineering and nuclear fuel reprocessing fields. Pulsed Disc and Doughnut Column (PDDC) is a recently developed liquid-liquid extraction equipment to recovery valuable materials. For its high throughput, no rotating parts and self-cleaning properties, PDDC promises excellent operation characteristics. Determination of droplet size distribution (DSD) is of good significance for the research and design of PDDC. Population balance model (PBM) is the most promising method to predict the DSD of liquid-liquid system. Coupled with computational fluid dynamics (CFD), the evolution of droplet diameter is directly derived from the solution of population balance equations. CFD simulation provides the general parameters of flow field while PBM offers a variable droplet size to calculate phase momentum and mass interactions. It gives a refined image of the complex liquid-liquid flow in extraction equipment’s. CFD-PBM method processed well in recent years, but its applications on PDDC are rarely reported due to the lack of proper kernel functions to describe droplet behaviors. Application of CFD-PBM method to predict droplet size distribution depends on the kernel functions to describe breakage and coalescence events of droplets. Many droplet breakup and droplet-droplet coalescence functions have been derived theoretically or correlated experimentally. Although kernel functions proposed by these researchers are frequently used, their feasibility to the CFD-PBM simulation of two-fluid flow in PDDC needs further investigation. In view of the lack of suitable PBM kernel functions in PDDC, we proposed an experimental correlation for droplet breakage kernel functions in PDDC. This is the first PBM kernel functions particularly designed for the PDDC, precisely, based on directly measured droplet breakage data The main purpose of this work is to couple these droplet breakage kernel functions into the CFD-PBM simulation of PDDC and investigate the liquid-liquid flow behaviors.
机译：液 - 液流是常见的化学工程方法，其中一种液体相分散在另一相中以增强混合溶剂萃取，液 - 液流动的一个典型例子的液滴，已经在湿法冶金，环境工程和核燃料被用于再加工领域。脉冲盘和圆环柱（PDDC）是近年来发展起来的液 - 液萃取设备，以回收有价值的材料。对于其高吞吐量，无旋转部件和自洁性能，PDDC承诺优秀的操作特性。液滴大小分布（DSD）的测定是对PDDC的研究和设计良好的意义。群平衡模型（PBM）是预测液 - 液系统的DSD最有前途的方法。再加上计算流体动力学（CFD），液滴直径的演变是直接从人口平衡方程组的解的。 CFD模拟提供流场的一般参数，同时PBM提供可变液滴尺寸来计算相位动量和质量的相互作用。它提供了在提取设备的复杂液体，液体流动的斯文形象。 CFD-PBM方法在近几年处理好，但其对PDDC应用很少，由于缺乏适当的内核函数来描述液滴行为的报道。 CFD-PBM方法的预测的液滴尺寸分布的应用依赖于核函数来描述的液滴破裂和聚结的事件。许多液滴破裂和液滴的聚结液滴功能已经理论上导出或通过实验相关。虽然这些研究人员提出的内核函数被频繁使用时，它们在PDDC双流体流动的CFD-PBM模拟可行性需要进一步调查。鉴于缺乏PDDC合适PBM内核的功能，我们提出用于PDDC液滴破碎内核函数的实验关系。这是特别设计用于PDDC第一PBM内核函数，精确地说，基于直接测量液滴破碎数据这项工作的主要目的是为连接这些液滴破碎内核函数到PDDC的CFD-PBM模拟和调查液 - 液流动的行为。

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