钠工艺间发生钠火事故会产生有害的气溶胶，为分析钠火气溶胶粒子迁移所带来的影响，针对气溶胶粒子在工艺间墙体内迁移过程，利用计算流体动力学（computational fluid dynamics, CFD）方法基于实际混凝土缝隙特征，构建类比真实缝隙的微通道网格结构，建立二维水平微通道流动模型，考虑重力、惯性力、Saffman升力以及布朗扩散对粒子运动的影响，构建微通道粒子运动模型，对不同缝隙结构进行粒子滞留特性数值模拟。结果表明：当缝隙尺寸小于亚毫米时，认为该缝隙不存在引起大量气溶胶粒子泄漏风险；混凝土缝隙内分支拐角和凹凸不平的微小结构可以有效降低粒子在缝隙中的穿透系数，减少泄漏。

Sodium fire accidents in sodium technology room can generate harmful aerosols. To analyze the impact of sodium fire aerosol particle migration, a microchannel grid structure similar to real cracks was constructed using computational fluid dynamics(CFD) method based on the actual concrete crack characteristics to simulate the migration process of aerosol particles in the room wall. A two-dimensional horizontal microchannel flow model was established, considering gravity, inertial force, and the influence of Saffman lift and Brownian diffusion on particle motion was studied, and a microchannel particle motion model was constructed to numerically simulate particle retention characteristics for different gap structures. The results indicate that when the gap size is less than submillimeter, it is considered that there is no risk of causing a large amount of aerosol particle leakage in the gap. The branching corners and uneven micro structures within concrete gaps can effectively reduce the penetration coefficient of particles in the gaps and reduce leakage.