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首页> 外文期刊>Chemical Engineering Research & Design: Transactions of the Institution of Chemical Engineers >Hydrodynamic behaviors and mixing characteristics in an internal loop airlift reactor based on CFD simulation
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Hydrodynamic behaviors and mixing characteristics in an internal loop airlift reactor based on CFD simulation

机译：水动力行为和混合特征基于CFD在内部循环空运反应堆模拟

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摘要

This work aims to systematically study hydrodynamics and mixing characteristics in an internal airlift reactor using a computational approach. A 3D transient Eulerian-Eulerian multiphase model is carried out with the standard k-epsilon turbulence model, and the results are used to simulate a virtual tracer. Parameters of importance in the design of airlift reactors, such as the mixing time, circulation time, axial dispersion number, and axial dispersion coefficient, are presented in addition to basic hydrodynamic parameters, such as gas holdup and fluid velocities based on full 3D simulation. The effects of the superficial gas velocity, the downcomer diameter (A(r)/A(d)), H-I/d(r) ratio, and scaling up were investigated. The key observations were as follows. With increasing superficial gas velocity, the dispersion number increases, leading to more mixing. Increasing the downcomer area leads to lower dispersion number in the riser and consequently a more plug-flow-like behavior. A greater draft tube height causes a lower dispersion number but a higher dispersion coefficient due to a greater draft tube effect. Using a larger reactor with geometric similarity provides a higher dispersion number with more mixing because of reduced wall effect. In addition, correlations were proposed for gas holdup, circulation velocity, and dispersion coefficients for riser and downcomer. (C) 2016 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
机译：这项工作的目的是系统地研究在流体动力学和混合特征内部使用计算空运反应堆的方法。多相模型与标准执行k-epsilon湍流模型和结果用来模拟一个虚拟的示踪剂。空运反应堆设计的重要性,如混合时间、循环时间轴分散数和轴向色散系数,除了基本的水动力参数,如气体停滞和基于全三维模拟流体速度。表面气体速度的影响下水管直径((r) / (d)),设定h / d (r)比值,和扩大了。观察结果如下。表面气体速度,分散的数字增加,从而导致更多的混合。下水管区域导致低色散的数字在立管,因此更多plug-flow-like行为。高度会导致较低的色散但数量由于更大更高的弥散系数通风管的效果。几何相似性提供了一个更高的分散数量更多的混合,因为减少了墙的效果。气体停滞,流通速度,色散系数对隔水管和下水管。(C) 2016化学工程师学会。爱思唯尔出版的帐面价值保留所有权利。

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