摘要
对物体在流化床中的终端末速进行了实验研究和理论分析 ,结果发现 ,随着流化粒子粒度的增大 ,床层表观粘度增大 ,但只引入少量粗粒子对流化床表观粘度影响不大 .物体上浮时受到的阻力要比下落时大一个数量级 ,平躺在气体分布板上的扁平状物体受到的浮力比理论计算值小得多 .物体迎流面积大小受床中流化粒子横向流动影响 ,并非总以最小迎流面积上升和下沉 。
The terminal velocity of an object moving in gas solid fluidized beds was experimentally and theoretically studied. The results indicate that the apparent viscosity of the bed increases with the increase of fluidized particle size, but it varies little when some coarser particles are mixed with the fluidized particles. The resistance to a rising object is one order magnitude greater than that to a settling object. The efficient buoyancy on a flaky object, which lies flat on the gas distributor, is much less than that calculated according to the Archimedes’ principle. An object does not always rise or settle with minimal projective area owing to radial motion of the fluidized particles, but in the lower part of the bed, the bar shaped objects tend to rise or settle with minimal projective area.
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2001年第1期5-8,共4页
Journal of China University of Mining & Technology
基金
国家九五攻关项目! ( 95 -2 15 -0 3 )
高等学校骨干教师资助!计划 ( 2 0 0 0 -65 )
