摘要
本文对空气和水流过烧结微细多孔介质内部的流动阻力进行了实验研究和数值模拟,分析不同颗粒直径条件下摩擦因子与等效雷诺数的关系。结果表明:对于水,实验及数值模拟得到的摩擦因子与经验公式符合很好。对于空气,当颗粒直径为200μm和125μm时,由于可压缩性的影响,摩擦因子略大于经验公式结果。当颗粒直径为90μm和40μm时,实验及考虑速度滑移得到的摩擦因子小于经验公式结果。因此,当颗粒平均直径小于90μm时,空气在微细多孔介质中的流动需要考虑稀薄气体效应。
The flow characteristics of water and air in microporous tubes were studied experimentally and numerically. The experimentally measured and numerically calculated friction factors for water in the porous media with average diameters of 200 μm and 40 μm and for air in the porous media with average diameters of 200 μm and 125 μm agree well with the known correlation. The experimental and calculated friction factors for air in the microporous media with 90 μm and 40 μm are much less than the known correlation. The results show that rarefaction effects occur in air flows in the microporous media with particle diameters less than 90 μm.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2007年第5期841-843,共3页
Journal of Engineering Thermophysics
基金
国家杰出青年科学基金(No.50025617)
清华大学基础研究基金(No.JCpy2005049)
关键词
微细多孔介质
实验研究
数值模拟
摩擦因子
microporous media
experiment
numerical simulation
friction factor
