亚微米颗粒在裂缝中沉积行为的实验研究  

Experimental Study on the Deposition Process of Submicron Particles in Cracks

作　　者：吴艳敏[1] 刘龙波[1] 王铁良[1] 张志弘[1] 

机构地区：[1]西北核技术研究所,西安710024

出　　处：《现代应用物理》2013年第3期282-288,共7页Modern Applied Physics

摘　　要：制作了准直型、L型及Z型等不同形状,不锈钢、花岗岩和水泥等不同材质的裂缝,测量了缝宽范围0～1.0 mm、气体流速范围0～10 m·s-1时的颗粒透过率,初步研究了亚微米颗粒在裂缝中的沉积行为.结果表明:准直光滑裂缝中颗粒沉积机理较简单,可以用经验公式较好地描述;曲折裂缝中碰撞机理的作用主要受流速的影响.材质对透过率的影响主要表现为工作面粗糙度的影响;对于工作面粗糙的裂缝,最易透过流速为1.0 m·s-1,最易透过粒径为0.39 μm.The deposition process of submicron particles in cracks was studied experimentally in this paper.Cracks of various shapes and materials were prepared.Crack widths and test velocities were confined to be 0~1.0mm and 0~10m·s-1,respectively.The results indica- ted that the penetration of particles through collimated smooth stainless steel slots can be well predicted by empirical formula.The influence of the material on penetration depends on the roughness of working faces,while the stream velocity mainly affects the collision mecha- nism for knee cracks.For cracks with rough surfaces,the particles with a size of 0.39μm and penetration velocity of 1.0m·s-1 are most likely to go through.

关 键 词：放射性颗粒 裂缝 沉积行为 泄漏 透过率 

分 类 号：X513[环境科学与工程—环境工程]