湿度对矩形窄通道内细颗粒热泳沉积的影响  

Impact of Humidity on Aerosol Thermophoretic Deposition Rectangular Narrow Channel

作　　者：周涛[1,2] 杨旭[1,2] 林达平[1,2] 樊昱楠[1] 汝小龙[1] 

机构地区：[1]华北电力大学核热工安全与标准化研究所,北京102206 [2]北京市非能动安全技术重点实验室,北京102206

出　　处：《上海交通大学学报》2015年第5期718-724,共7页Journal of Shanghai Jiaotong University

基　　金：北京市自然科学基金(3092016);教育部博士点基金(200800791005)项目资助

摘　　要：通过建立考虑空气含湿量影响的矩形窄通道模型,利用Fortran软件编程及Fluent软件模拟,研究了矩形窄通道内细颗粒的热泳沉积情况,提出了一种利用Fluent软件计算矩形窄通道内热泳沉积率的方法,并与Fortran编程的计算结果进行比较.结果表明,随着空气含湿量增大,热泳沉积率增加;在空气含湿量相同的条件下,热泳沉积率随着颗粒直径减小而增大,随着管道内压力增加而减少,随着温度梯度增大而增加;此外,不同粒子的热物性不同,导致其热泳沉积率不同;所提出的计算方法虽能够反映热泳沉积率随空气含湿量、颗粒直径和压力变化的规律,但其计算结果偏小,可采取增大管道内空气含湿量及减小管道内压力的措施来提高细颗粒的热泳沉积率.The code of Fortran and Fluent were selected to study thermophoretic deposition of particles in rectangular narrow channel by considering the humidity ratio of air. Meanwhile, an approach of using the code of Fluent to calculate the thermophoretic deposition rate was proposed, and verified by the results of Fortran programming. The results show that the thermophoretic deposition rate increases with the increase of humidity ratio of air. When the humidity ratio is invariant, the thermophoretic deposition rate increases with the decrease of particle size and pressure, and with the increase of temperature gradient. In addition,different thermal properties of different particles lead to differences in thermophoretic deposition rate. Although the method proposed could reflect the law that the thermophoretic deposition rate changes with the humidity ratio, particle size and variation of the pressure, the calculation result is small. Meas- ures such as improving the humidity ratio of gas and reducing the pressure in the pipe can be taken to in- crease the deposition rate of fine particles.

关 键 词：气溶胶 热泳 含湿量 窄矩形 多相流 

分 类 号：TL331[核科学技术—核技术及应用]