衰变对放射性气溶胶在长直方管中的输运影响  

Impact of Decay on the Transport of Radioactive Aerosols in Long Square Tubes

作　　者：刘满 夏明明 陈志[1] Liu Man;Xia Mingming;Chen Zhi(School of Nuclear Science and Technology,University of Science&Technology of China,Hefei,230027,China;Nuclear Power Institute of China,Chengdu,610213,China)

机构地区：[1]中国科学技术大学核科学技术学院,合肥230027 [2]中国核动力研究设计院,成都610213

出　　处：《核动力工程》2024年第4期205-212,共8页Nuclear Power Engineering

摘　　要：衰变射线会导致放射性气溶胶颗粒表面电荷积累,进而影响其迁移过程。然而,目前放射性核素输运模拟中并没有考虑衰变的荷电效应。本文基于Python建立颗粒衰变荷电模型,然后提出颗粒衰变荷电、流场耦合方案,并在流体仿真软件Fluent中完成耦合。分别对含^(106)Ru、^(131)I、^(132)Te、^(137)Cs颗粒衰变荷电模型结果进行分析,结果表明颗粒电荷会在较短时间后达到平衡值。在Fluent中模拟含132Te的颗粒在长直方管中的流动,结果表明电场力主要存在于管壁附近,指向颗粒浓度下降方向,这表明衰变荷电会促进气溶胶的扩散,使其更快地充满整个空间。本文的研究为后续放射性核素输运模拟时,对衰变、电场和流场的耦合方案和模拟结果提供参考。Decay radiation can cause accumulation of surface charges of radioactive aerosol particles,and then affect their migration process.However,the charge effect of decay is not considered in the current radionuclide transport simulation.In this study,a particle decay charging model was established based on Python,and a coupled scheme of particle decay charging and flow field was proposed and implemented in Fluent.The results of decay charge model of particles containing^(106)Ru,^(131)I,^(132)Te and 137Cs are analyzed respectively,and the results show that the particle charge will reach the equilibrium value in a short time.The flow of particles containing 132Te in a long square tube is simulated in Fluent.The results show that the electric field force mainly exists near the tube wall,pointing to the direction of particle concentration decline,which indicates that decay charge will promote the diffusion of aerosol and fill the whole space more quickly.This study provides a reference for the coupling scheme and simulation results of decay,electric field,and flow field in subsequent simulations of radioactive nuclide transport.

关 键 词：衰变 欧拉-拉格朗日方法 放射性核素 气溶胶 静电力 

分 类 号：TL334[核科学技术—核技术及应用]