浙江大学学报(工学版)  2019, Vol. 53 Issue (12): 2264-2270    DOI: 10.3785/j.issn.1008-973X.2019.12.002
 机械与能源工程

Rheological distribution algorithm of cement paste based on particle-flow-interaction theory
Xiao-tian LI(),Chu-xin WANG,Yong-qiang YU
School of Mechanical Engineering, Tongji University, Shanghai 201804, China
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Abstract:

An iterative algorithm based on theoretical fluid dynamics was proposed to shorten the simulation time of the cement paste in rotary viscometer. The flow field was layered radially according to the central symmetry of the flow field. An iterative algorithm was constructed under the assumption of continuity and uniformity of the fluid in the layer. The shear rate of each layer was calculated with Reiner-Riwlin Equation, and the rheological parameters of cement paste in the flow field were further calculated with particle-flow-interaction (PFI) theory. The average error between the simulation results of the iterative algorithm and that of the finite difference method was 0.89%. The average error between the simulation results of the iterative algorithm and the experimental results was 4.23%. Compared with the finite difference method, the simulation time was shortened from 5 days to 2.55 seconds, thus the calculation efficiency was greatly improved. The algorithm can be used for efficient simulation for cement paste flow field in rotary viscometer, and also for fast calibration of PFI parameters of cement paste.

Key words: cement paste    particle-flow-interaction (PFI) theory    theoretical fluid mechanics    Reiner-Riwlin equation    iterative operation

 CLC: TU 528.1

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Xiao-tian LI,Chu-xin WANG,Yong-qiang YU. Rheological distribution algorithm of cement paste based on particle-flow-interaction theory. Journal of ZheJiang University (Engineering Science), 2019, 53(12): 2264-2270.

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 图 1  有限差分法网格划分示意图 图 2  回转黏度仪转子结构示意图 图 3  黏度仪流场区域径向分层示意图 图 4  单个时间步内黏度仪流场更新流程图 图 5  黏度仪流场内部流变特性参数更新流程图 图 6  黏度仪迭代算法仿真转速曲线 表 1  迭代算法与有限差分法仿真参数设置 图 7  迭代算法、有限差分法仿真结果对比 表 2  变转速试验迭代算法仿真参数设置 图 8  黏度仪试验转速曲线 图 9  试验结果和迭代算法仿真结果对比
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