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浙江大学学报(工学版)
浙江大学学报(工学版)  2019, Vol. 53 Issue (3): 420-426    DOI: 10.3785/j.issn.1008-973X.2019.03.002
机械工程     
水泥3D打印喷头中浆体的流动分析
高阳(),方成刚*(),蒋贤辉
南京工业大学 机械与动力工程学院，江苏 南京 211800
Analysis of slurry flow in cement 3D printing nozzle
Yang GAO(),Cheng-gang FANG*(),Xian-hui JIANG
College of Mechanical and Power Engineering, Nanjing Tech University, Nanjing 211800, China
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摘要：

针对水泥浆体在流经水泥3D打印样机喷头结构时沾黏、流动性差的问题，提出一种基于多松弛参数格子玻尔兹曼方法（MRT-LBM）的模型，研究幂律流体在单螺杆机构中的流动特性. 采用MRT-LBM修正模型，对水泥浆体在喷头中的流动情况进行数值模拟，得到水泥浆体在喷头装置内不同位置处的速度分布情况，为水泥3D打印喷头结构提出改进方案. 通过已有理论解的泊肃叶流对修正后的MRT-LBM模型进行详细论述，并将解析解与MRT-LBM修正模型得到的结果进行对比，验证分段幂律模型的可行性. 最后，改变晶格节点的数量（10~500），计算实验结果与理论结果的相对误差，结果表明修正后的MRT-LBM模型是稳定的.
关键词： 幂律流体;  多松弛参数格子玻尔兹曼方法（MRT-LBM）;  水泥3D打印喷头;  泊肃叶流;  分段幂律模型    
Abstract:

A model based on multiple-relaxation time lattice Boltzmann method (MRT-LBM) was proposed to study the flow characteristics of power-law fluid in single screw mechanism, aiming at the problem of poor adhesion and fluidity of cement slurry when flowing through the nozzle structure of cement 3D printing prototype. The cement paste flow in the printing nozzle was numerically simulated by the modified MRT-LBM model; the cement paste velocity distribution in different positions was obtained, which can help optimize the nozzle structure. the modified MRT-LBM model was discussed in detail by Poiseuille flow with theoretical solution, and the analytical solution was compared with the results obtained by the modified MRT-LBM model to verify the correctness of the truncated power-law model. Finally, the relative error between the experimental results and theoretical results was calculated when the number of lattice nodes changes from 10 to 50, which indicates that the modified MRT-LBM model is stable.
Key words: power-law fluid    multiple-relaxation-time lattice Boltzmann method (MRT-LBM)    cement 3D printing nozzle    Poiseuille flow    truncated power-law model
收稿日期: 2018-01-25 出版日期: 2019-03-04
CLC:  TH 112.6  
通讯作者: 方成刚     E-mail: gaoyang6156@163.com;njtechfcg@126.com
作者简介: 高阳（1990—），男，硕士生，从事增材制造研究. orcid.org/0000-0001-8875-3135. E-mail： gaoyang6156@163.com
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引用本文:

高阳,方成刚,蒋贤辉. 水泥3D打印喷头中浆体的流动分析[J]. 浙江大学学报(工学版), 2019, 53(3): 420-426.

Yang GAO,Cheng-gang FANG,Xian-hui JIANG. Analysis of slurry flow in cement 3D printing nozzle. Journal of ZheJiang University (Engineering Science), 2019, 53(3): 420-426.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2019.03.002    或    http://www.zjujournals.com/eng/CN/Y2019/V53/I3/420

图 1  水泥3D打印喷头内部螺杆结构图
图 2  水泥3D打印喷头内部螺槽结构展开图
图 3  MRT-LBM修正模型中速度分量沿螺槽深度的分布图
图 4  MRT-LBM修正模型中速度分量沿螺槽宽度的分布图
图 5  MRT-LBM修正模型中速度分量沿螺槽深度的分布图
图 6  MRT-LBM修正模型中速度分量沿螺槽宽度的分布图
图 7  幂律指数不同时的速度分布图
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