摘要
为改善多维度旋转耦合场制备Si_(3)N_(4)流动性及粒度分布的微球特性,研究了不同均化-制粒组合结构对多维度旋转耦合室内流场分布的影响,建立了Euler-Euler气固两相流模型,简化了多维度旋转耦合室物理模型,分析了不同均化-制粒组合结构对多维度旋转耦合场制备Si_(3)N_(4)微球的流场分布影响。数值模拟结构表明,18-8均化-制粒结构具有较好的制粒效果,在其径向体积分布及轴向体积分布云图中,颗粒分布均匀,具有较好的混合效果。其中,径向分布云图中体积分布主要集中在0.77-0.78,占总面积的70%,轴向体积分布云图中,主要分布在0.70-0.80之间,占总面积的69%。试验结果表明,18-8均化-制粒组合结构制备的Si_(3)N_(4)微球具有最佳的球形度和流动性,且微球合格率达到94.3%。试验结果进一步验证了数值模拟的正确性。
In order to improve the performances of Si_(3)N_(4) microspheres prepared by using multi-dimensional rotating coupling field,the effect of homogenization-granulation combination on the flow field distribution in the multi-dimensional rotating coupling chamber was studied.The Euler-Euler gas-solid two-phase flow model was established and the physical model of multidimensional rotating coupling chamber was simplified.The influence of different homogenization-granulation combination on the flow field distribution of the Si_(3)N_(4) microspheres was analysed.The numerical simulation structure shows that the 18-8 homogenization and granulation structure has good granulation effect.In the radial volume distribution and axial volume distribution cloud images,the particle distribution is uniform and has good mixing effect.In the radial volume distribution cloud image,the volume distribution mainly concentrates in 0.77-0.78,accounting for 70%of the total area.It is mainly distributed in 0.70-0.80,accounting for 69%of the total area.The Si_(3)N_(4) microspheres prepared with the combination of 18-8 homogenization and granulation had the most perfect sphericity and fluidity,while the qualified rate of the microspheres reached 94.3%.Experimental results further verify the correctness of the numerical simulation.
作者
江虹
罗宏斌
周健震
JIANG Hong;LUO Hongbin;ZHOU Jianzheng(School of Mechanical and Electronic Engineering,Jingdezhen Ceramic University,Jingdezhen 333403,Jiangxi,China;Jiangxi Engineering Laboratory for Ceramic Materials Processing Technologies,Jingdezhen 333403,Jiangxi,China)
出处
《陶瓷学报》
CAS
北大核心
2021年第5期874-881,共8页
Journal of Ceramics
基金
国家自然科学基金(61741110)。
关键词
多维度旋转耦合场
Si_(3)N_(4)微球
均化-制粒组合结构
体积流场分布
速度流场分布
multi-dimensional rotating coupling field
Si_(3)N_(4)microspheres
homogenization-granulation combination
volume flow field distribution
velocity flow field distribution
