摘要
中浓纸浆悬浮液 (浆浓大于 1 0 %时 )的纤维网络具有明显的强度 ,表观粘度值较高 ,其在管道内低速流动时 ,流场分为 2个区域 ,文中根据CFD(计算流体动力学 )的数值模拟研究了中浓纸浆在变径管内的塞流流动 ,模拟结果和实验结果同时表明 ,对于中浓纸浆 ,当在变径管道内流动时的初始流速较小时 ,整个流场分为近壁面的环形区域和除环形区外的主流区域 ;如果流速太低 ,极可能造成管道内近壁区的浆料滞流 ,而管道中心处的纸浆流动呈“沟流”现象。
The fibres network has high intensity and apparent viscosity when the mass consistency of pulp suspension is up to 10%. The fluid field is divided into two areas when medium-consistency (MC) suspension flows at low velocity in a pipeline. This paper described computational fluid dynamics (CFD) simulation of medium-consistency suspension plug flow in diameter-varying pipeline, the simulation and experiment showed:“viscosity flow” behavior exists in the annular region near the wall and 'plug flow' exists in the main region. The pulp suspension near the wall will stop flowing and only the pulp suspension in the center of the pipeline flows if the initial velocity is too low, it is the phenomenon called “channel flow”.
出处
《中国造纸学报》
CAS
CSCD
北大核心
2004年第2期96-98,共3页
Transactions of China Pulp and Paper
