Abstract

In this study, a Eulerian Wall Film (EWF) model and a discrete phase model (DPM) are applied to simulate the phenomenon of droplet re-entrainment in a baffle demister. The primary objective was to design a new hook plate and evaluate its influence on the performance. The results show that the phenomenon of droplet re-entrainment occurs owing to the separation and stripping of the liquid film at the corner of the demister. Moreover, the liquid film strips at the areas where the local velocity is quite high near the wall of the demister. With the installation of the hook, the removal efficiency increased from 68.4% to 87.2% at 3 m/s inlet velocity. When the inlet velocity was increased to 6 m/s, the removal efficiency reached 96.7%, indicating that the existence of the hook plate further improved the efficiency of the demister, whereas the pressure loss of the system also increased.

摘要

在这项研究中，应用欧拉壁膜 (EWF) 模型和离散相模型 (DPM) 来模拟挡板除雾器中液滴重新夹带的现象。主要目标是设计一种新的钩板并评估其对性能的影响。结果表明，由于除雾器角部液膜的分离和剥离，会出现液滴重新夹带现象。此外，液膜在除雾器壁附近局部速度相当高的区域剥离。随着吊钩的安装，在 3 m/s 入口速度下，去除效率从 68.4% 提高到 87.2%。当入口速度提高到 6 m/s 时，去除效率达到 96.7%，说明钩板的存在进一步提高了除雾器的效率，