摘要
在水煤浆综合输送试验装置上,采用直径分别为25 mm、32 mm、40 mm和50 mm的圆管,对质量分数为65.3%、67.1%和68.2%的高浓度水煤浆进行了流动特性和滑移特性试验研究.从合理假设的滑移速度模型和流动结构出发,得出滑移速度和真实流变特性的确定方法,获得了不同浓度和管径下试验水煤浆的滑移速度及真实流变特性.结果表明:所采用的滑移速度模型能很好地描述所试验水煤浆的宏观滑移流动规律;煤浆浓度较高时,呈现显著的非牛顿流体特性,壁面滑移效应显著;壁面滑移效应与煤浆的真实流变特性关系密切,两者共同支配管内流动,对流动特性影响显著.
Experimental researches were carried out to investigate slip and flow properties of highly concentrated coal water slurry （CWS） in a pilot-scale transportation system. Three concentration of CWS of 65.3% , 67.1% and 68.2% , and a series of straight pipelines with the inner diameters of 25, 32, 40 and 50 mm were used. A new method of finding slip velocity and true rheological behavior was derived according to the new slip model and flow structure of CWS flowing in a straight pipe. Using the new slip model, slip velocities and true theological properties of three concentration of CWS flow in the pipes were gained. The results suggest that the slip model used is suitable for delineating slip properties of highly-loaded CWS flowing in the straight pipe; at a high concentration, experimental CWS exhibits true rheological behaviors of notable non-Newtonian behavior and the flow properties are strongly affected by slip at the wall; there are close connections between wall slip and true rheological behavior, and the two dominate the flow behavior of CWS.
出处
《燃烧科学与技术》
EI
CAS
CSCD
北大核心
2008年第4期317-322,共6页
Journal of Combustion Science and Technology
基金
国家重点基础研究发展计划(973)资助项目(2004CB217701)
关键词
水煤浆
流变特性
壁面滑移
流动特性
coal water slurry
rheological property
wall slip
flow property
