江苏大学学报（自然科学版）2017，Vol.38Issue(3)：289-294,301,7.DOI:10.3969/j.issn.1671-7775.2017.03.007
雾滴内部流动及二氧化硫吸收过程的数值模拟
Numerical simulation on circulation and absorption of sulfur dioxide inside droplet
摘要
Abstract
When the droplets move in flow field in processes of spray flue gas desulfurization,the internal recirculation flow is formed inside droplet due to surface tangent stress to influence the internal mass transfer of droplet greatly and improve the SO2 absorption by spray droplet.The volume of fluid (VOF) method was employed to simulate the internal circulation flow and diffusion inside water droplet.The distribution of tangential velocity at interface and the effect of internal circulation on sulfur dioxide transfer were analyzed for different Reynolds numbers.The numerical results indicate that there are two symmetrical vortexes inside droplets when there is relative motion between gas phase and liquid phase.The distance between vortex core and droplet center is 2/3-Rd,and the vortex velocity is raised with the increasing of Reynolds number.The absorption of sulfur dioxide by droplet is controlled by two mechanisms of radial diffusion by concentration gradient and diffusion by internal circulation.The comparison of characteristic times for radial diffusion inside droplet and vortex formation and sulfur dioxide mass transfer by circulation flow shows that the internal circulation flow has remarked effect on the sulfur dioxide mass transfer of water droplet.The effect of internal circulation is gradually enhanced with the increasing of Reynolds number.关键词
雾滴/内部流动/VOF/二氧化硫/传质/数值模拟Key words
droplet/internal circulation/VOF/sulfur dioxide/mass transfer/numerical simulation分类
能源科技引用本文复制引用
王贞涛,郭天宇,夏磊,董庆铭..雾滴内部流动及二氧化硫吸收过程的数值模拟[J].江苏大学学报（自然科学版）,2017,38(3):289-294,301,7.基金项目
国家自然科学基金资助项目(51106064,11502097) （51106064,11502097）
江苏省自然科学基金资助项目(20150511) （20150511）
江苏大学青年基金资助项目(FCJJ2015001) （FCJJ2015001）
