Analysis of swarm flow and bubble residence time under pool scrubbing conditions

IF 1.9 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Annals of Nuclear Energy Pub Date : 2024-10-07 DOI:10.1016/j.anucene.2024.110956

Fanli Kong, Xu Cheng

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引用次数: 0

Abstract

In severe accidents of nuclear power plants, large amounts of fission products existing as radioactive aerosols are released. Pool scrubbing plays an important role in the removal of radioactive aerosols. Bubble residence time is one of the key parameters to determine the efficiency of aerosol removal, especially in the swarm flow region which makes a very important contribution to the total aerosol removal. In this study, the Euler-Euler-Lagrangian approach is built to track the evolution of bubble motion and to determine the bubble residence time in the liquid pool. Specifically, the Euler-Euler two-fluid approach is utilized to resolve the flow field of gas and liquid phases, while the Lagrangian approach is employed to track the discrete bubbles and to obtain the bubble residence time. The results reveal that the present approach is feasible to predict the bubble dynamics and residence time in the liquid pool. Bubble residence time is dependent on the initial position, where bubbles deviating from the central region could remain inside the liquid pool for a longer physical time. The bubble diameter, volume flow rate and submergence height are key parameters affecting the bubble residence time. And comparison between the simulated bubble residence time and the model-predicted results is carried out, indicating the discrepancy of simulated residence time and limitations of the existing model at high volume flow rate and high submergence.

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水池洗涤条件下的群流和气泡停留时间分析

在核电站的严重事故中，大量裂变产物以放射性气溶胶的形式释放出来。水池洗涤在清除放射性气溶胶方面发挥着重要作用。气泡停留时间是决定气溶胶去除效率的关键参数之一，尤其是在群流区域，它对气溶胶的总去除率有非常重要的贡献。本研究采用欧拉-欧拉-拉格朗日方法来跟踪气泡运动的演变，并确定气泡在液池中的停留时间。具体来说，欧拉-欧拉双流体方法用于解析气相和液相流场，而拉格朗日方法用于跟踪离散气泡并获得气泡停留时间。结果表明，本方法可用于预测气泡动力学和在液池中的停留时间。气泡停留时间取决于初始位置，偏离中心区域的气泡在液体池中停留的物理时间更长。气泡直径、体积流量和浸没高度是影响气泡停留时间的关键参数。模拟气泡停留时间与模型预测结果进行了比较，表明在高体积流量和高浸没度条件下，模拟停留时间与现有模型的局限性存在差异。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Annals of Nuclear Energy 工程技术-核科学技术

CiteScore

4.30

自引率

21.10%

发文量

632

审稿时长

7.3 months

期刊介绍： Annals of Nuclear Energy provides an international medium for the communication of original research, ideas and developments in all areas of the field of nuclear energy science and technology. Its scope embraces nuclear fuel reserves, fuel cycles and cost, materials, processing, system and component technology (fission only), design and optimization, direct conversion of nuclear energy sources, environmental control, reactor physics, heat transfer and fluid dynamics, structural analysis, fuel management, future developments, nuclear fuel and safety, nuclear aerosol, neutron physics, computer technology (both software and hardware), risk assessment, radioactive waste disposal and reactor thermal hydraulics. Papers submitted to Annals need to demonstrate a clear link to nuclear power generation/nuclear engineering. Papers which deal with pure nuclear physics, pure health physics, imaging, or attenuation and shielding properties of concretes and various geological materials are not within the scope of the journal. Also, papers that deal with policy or economics are not within the scope of the journal.