A combined CFD modeling with population balance equation to predict pressure drop in venturi scrubbers
A combined CFD modeling with population balance equation to predict pressure drop in venturi scrubbers
复制标题
结合 CFD 建模与群体平衡方程来预测文丘里洗涤器的压降
DOI：
10.1007/s11164-013-1018-2
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
A. Mohebbi
中科院分区：
文献类型：
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作者：
A. Sharifi;A. Mohebbi
文丘里洗涤器是空气污染控制的最重要设备之一。虽然有不同的预测文丘里洗涤器压降的模型，但大多数都存在一些缺陷，不能正确预测压降。在这项研究中，第一次，欧拉-欧拉计算流体动力学（CFD）模型相结合的人口平衡方程来预测文丘里洗涤器的压降。该模拟考虑了用于液滴分散和液滴尺寸分布的多尺寸组模型，该模型基于群体平衡方程。流场计算采用时均连续性方程和Navier-Stokes方程沿着，采用标准k-ε湍流模型。这些方程包括阻力、湍流弥散和浮力。将考虑粒子数平衡方程和不考虑粒子数平衡方程的计算压降与实验数据进行比较，以评估CFD模型的准确性。研究了不同液气比和喉道气速条件下文丘里洗涤器内不同位置的液滴粒径分布。结果表明，液滴的最大破碎发生在液体喷射点处。最后，研究了喷嘴直径和喷嘴排列方式对文丘里洗涤器压降的影响。
A venturi scrubber is one of the most important devices for air pollution control. Although there are different models for predicting the pressure drop in venturi scrubbers, most of them have some defects and cannot predict the pressure drop correctly. In this study, for the first time, an Eulerian–Eulerian computational fluid dynamics (CFD) model is combined with a population balance equation to predict the pressure drop in venturi scrubbers. This simulation takes into account a multiple size group model for droplet dispersion and droplet size distribution, which is based on a population balance equation. Flow field has been calculated by solving the time averaged continuity and Navier–Stokes equations along with the standardk–εturbulence model. The equations included drag, turbulent dispersion, and buoyancy forces. The calculated pressure drop with and without considering the population balance equation was compared with the experimental data to evaluate the accuracy of the CFD modeling. The size distribution of droplets in the venturi scrubber was studied at different points for different liquid to gas ratios and throat gas velocities. The results show that the maximum break-up of droplets happens at the liquid injection point. Finally, the effects of nozzle diameter and nozzle arrangement on pressure drop in venturi scrubbers were investigated.