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Evaluation of thermophoretic effects on graphite dust coagulation in high-temperature gas-cooled reactors

Particuology 2020年第4期18卷 45-52页

作者： Kaiyuan Wang Suyuan Yu Wei Peng Center for Combustion Energy Key Laboratory for Thermal Science and Power Engineering of Ministry of EducationDepartment of Energy and Power EngineeringTsinghua UniversityBeijing 100084China Institute of Nuclear and New Energy Technology Advanced Nuclear Energy Technology Cooperation Innovation CenterKey Laboratory of Advanced Nuclear Engineering and Safety of Ministry of EducationTsinghua UniversityBeijing 100084China

In high-temperature gas-cooled reactors,graphite dust particles within the reactor core and the heat transfer equipment experience large temperature *** such conditions,thermophoresis may play an important role in determining aerosol *** study presents a theoretical and numerical analysis of the thermophoretic effects on aerosol coagulation within these *** coagulation rates for Brownian versus thermophoretic coagulation are calculated and compared for various temperature *** results show that thermophoretic coagulation dominates over Brownian coagulation for large temperature *** defined an enhancement factor to evaluate the role of thermophoretic coagulation under various reactor *** enhancement factor increased dramatically with increasing temperature gradient,decreasing pressure and increasing particle diameter,but was not very sensitive to temperature *** time evolution of the particle size distribution related to combined Brownian and thermophoretic coagulation was simulated using a log-skew-normal method of *** simulation results indicate that aerosol evolution can be strongly accelerated by thermophoretic coagulation under large temperature gradients.

关键词： Graphite dust High-temperature gas-cooled reactor Thermophoretic coagulation log-skew-normal method of moments Particle size distribution

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