摘要
将格子Boltzmann(LB)方法用于研究陶瓷过滤管基体内的小Reynolds数单相气体流动。模拟中所用多孔介质结构由计算机随机生成。计算了过滤介质内阻力系数和Reynolds数间的关系,并将计算值与Blake-Kozeny方程和Ergun方程的解析值进行了对比,两者吻合。通过计算可以对多孔介质内的微观速度特征进行分析,得出了微观速度的变化规律,即在孔隙通道中,流体速度分布呈近似抛物线,在有效直径最小的截面上局部速度达到最大值;在孔隙结构的某一固定位置点处,其局部速度与表观过滤速度的比值是固定不变的。
The lattice Boltzmann method was used to simulate low Reynolds number gas flows through ceramic filter matrixes. The porous structure was generated randomly by computer under the simplification that the ceramic filter matrix was composed of numerous spheres with equal diameter. The relation between Reynolds number and friction factor was calculated, and the calculated values agreed well with analytical values of Blake-Kozeny equation and Ergun equation. The change of microscopic velocity in pores was obtained. In pores, the velocity distributions were parabolic curves approximately and they would reach the maximum on the section of the minimum effective diameter. At one specific point in pores, the ratio of its local velocity to superficial velocity was fixed.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2008年第12期3027-3032,共6页
CIESC Journal
基金
国家高技术研究发展计划项目(2007AA03Z524)~~
