期刊论文

Theoretical Study on Radon Exhalation in Circular Tubular Porous Media

中文

南华大学学报(自然科学版)

1673-0062

2020

34

1

1-8+15

10.19431/j.cnki.1673-0062.2020.01.001

国家自然科学基金项目（11575080）；

本校为第一机构

基于在多孔射气介质中氡的渗流-扩散迁移理论,建立了圆管状多孔射气介质氡的迁移数学模型,并获得了稳态条件下氡浓度分布的解析解和氡析出率的计算公式。通过研究,获得以下结论:1)圆管管壁内靠近圆管内外表面的氡浓度和氡浓度梯度随着扩散系数的增大而减小;2)圆管内外表面的氡析出率随扩散系数的增大而增大,并逐渐趋于最大值;整个圆管的氡析出份额随扩散系数的增大而增大并逐渐趋于1;3)圆管管壁内的氡浓度峰值的大小随着圆管内外表面压差值的增大而减小;其中氡浓度峰值最大时压差为20 Pa;氡浓度峰值最小时压差为60 Pa;4)当圆管内外表面存在压差时,高压侧的圆管表面的氡析出率随着压力梯度的增大...

Based on the theory of seepage and diffusion migration of radon in porous media,the mathematical model of radon migration in tubular porous media was established,and the analytical solution of radon concentration distribution and the calculation formula of radon exhalation rate under steady state were obtained.Through the study,the following conclusions are obtained:1) The radon concentration and radon concentration gradient near the inner and outer surface of the tube wall decrease with the increase of diffusion coefficient.2)The radon exhalation rate on the inner and outer surface of the tub...