摘要
为分析充填料浆在管道内的运动,根据流变学及流体力学理论,以Herschel-Bulkley(H-B)本构模型推导出管道层流通用方程,确定了流体管道层流临界条件的计算方法.根据所推导的管道层流通用方程,提出了一种流变参数测量方法,并采用工业级的L管实验装置和流变仪分别测定了某非牛顿流体充填料浆的流变参数.实验结果表明:当含屈服应力的非时变性非牛顿流体在管道层流运动时,管壁切应力沿管径线性分布,管壁处速度梯度和雷诺数有最大值、表观黏度有最小值,在管壁处流速为0;管道内存在半径较大的柱塞流区,柱塞流区边界处速度梯度为0;基于管道层流通用方程的管道试验方法与流变仪测定方法所得流变参数计算的流量结果基本一致.
To analyze filling slurry movement in pipeline,the general equation of pipeline laminar flow was deduced and the calculation method was determined based on rheology and fluid mechanics theory and Herschel-Bulkley(H-B) model.The rheological parameters measurement method was proposed according to the deduced general equation.The rheological parameters of filling slurry for a non-Newtonian fluid were measured by using industrial L-tube experimental device and rheometer.Experimental results show that the shear stress of pipeline wall shows a linear distribution along with the pipe diameter when the non-Newtonian fluid with yield stress moves in pipeline laminar flow.The velocity gradient and Reynolds number at the pipe wall is maximum,while the apparent viscosity is minimum and the flow velocity was 0.There is a plunger flow zone with large radius in the pipeline and the velocity gradient at the edges of plunger flow zone is 0.The flow rate calculated by the pipeline test method based on general equation is basically the same as that by the rheometer measurement method.
作者
兰文涛
吴爱祥
LAN Wentao;WU Aixiang(School of Civil and Environmental Engineering,University of Science and Technology Beijing,Beijing 100083,China;State Key Laboratory of the Ministry of Education of China for High-efficient Mining and Safety of Metal Mines,University of Science and Technology Beijing,Beijing 100083,China)
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2019年第11期61-65,102,共6页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家重点研究发展计划资助项目（2017YFC0602903)
国家自然科学基金资助项目(51674012)
关键词
非牛顿流体
管道层流
管道试验
流动方程
方程可视化
non-Newtonian fluid
pipeline laminar flow
pipeline test
flow equation
equation visualization
