Investigation on aerosol removal by spray droplets under severe accident conditions

IF 3.3 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY Progress in Nuclear Energy Pub Date : 2025-02-01 DOI:10.1016/j.pnucene.2024.105549

Peizheng Hu, Lili Tong, Xuewu Cao

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Abstract

The aerosol suspended in containment can be removed by the spray system, mitigating the potential risk of radioactive release during severe accidents. To analyze aerosol removal efficiency due to mechanical and phoretic effects of spray droplets, experiments were conducted under various thermal-hydraulic conditions at the Containment Aerosol and Thermal-Hydraulics (CATH) facility. Initial thermal-hydraulic conditions involved either pure air or gas mixture, with a pressure of 5 bar(a), steam fractions of 40%vol and 70%vol, and a temperature range of 20 °C–145 °C, simulating the severe accident conditions. The sprays were produced by a hollow cone nozzle with a volume mean diameter (VMD) of 370 μm at a constant spray flow rate. Results indicate that the removal efficiencies of mechanical effects, thermophoresis, and diffusiophoresis are comparable at a steam fraction of 40%vol, while diffusiophoretic effects increase to three times when steam fraction reaches 70%vol. Additionally, the evaluations of the present aerosol removal models show significant deviations from experiments, with inertial impaction is highly sensitive to increases in particle size, while the phoretic mechanism underestimates the effect of steam condensation.

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来源期刊

Progress in Nuclear Energy 工程技术-核科学技术

CiteScore

5.30

自引率

14.80%

发文量

331

审稿时长

3.5 months

期刊介绍： Progress in Nuclear Energy is an international review journal covering all aspects of nuclear science and engineering. In keeping with the maturity of nuclear power, articles on safety, siting and environmental problems are encouraged, as are those associated with economics and fuel management. However, basic physics and engineering will remain an important aspect of the editorial policy. Articles published are either of a review nature or present new material in more depth. They are aimed at researchers and technically-oriented managers working in the nuclear energy field. Please note the following: 1) PNE seeks high quality research papers which are medium to long in length. Short research papers should be submitted to the journal Annals in Nuclear Energy. 2) PNE reserves the right to reject papers which are based solely on routine application of computer codes used to produce reactor designs or explain existing reactor phenomena. Such papers, although worthy, are best left as laboratory reports whereas Progress in Nuclear Energy seeks papers of originality, which are archival in nature, in the fields of mathematical and experimental nuclear technology, including fission, fusion (blanket physics, radiation damage), safety, materials aspects, economics, etc. 3) Review papers, which may occasionally be invited, are particularly sought by the journal in these fields.