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.
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.
Fig.1Diagram for internal screw structure of cement 3D printing nozzle
Fig.2Expansion diagram of screw groove structure inside cement 3D printing nozzle
Fig.3Distribution diagram of velocity components along depth of spiral slot in MRT LBM correction model
Fig.4Distribution diagram of velocity components along width of spiral slot in MRT LBM correction model
Fig.5Distribution diagram of velocity components along depth of spiral slot in MRT LBM correction model
Fig.6Distribution diagram of velocity components along width of spiral slot in MRT LBM correction model
Fig.7Velocity distribution under different power law indexes
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