摘要
为研究干法造粒室中挡板结构对粉体混合效果的影响,通过构造欧拉两相流模型模拟粉体与空气的相互作用,采用k-epsilon RNG离散模型模拟湍流情况,采用滑移网格法和多重参考坐标系法分别求解动区域和静区域流场,分析了在造粒室内分别加装三种结构的挡板后对颗粒体积分数和速度场的影响。结果表明:当挡板横截面分别为长方形、三角形和半圆形时,颗粒体积分数径向云图显示体积分数小于0. 31的面积占比分别约为26%、18%、2%;体积分数大于0. 37的面积占比分别约为1%、15%、27%;颗粒速度大于0. 54 m/s的面积占比分别约为45%、20%、40%;颗粒轴向速度大于0. 4 m/s的面积占比分别约为80%、40%、35%。该结果显示长方形挡板造粒室更有利于促进粉体混合,提高粉体流动性。
In order to study the influence of baffle shape on the mixing effect of powder in dry granulation chamber,the Euler two-phase flow model was used to simulate the interaction between powder and air,the k-epsilon RNG discrete model was used to simulate turbulence,the moving mesh and multiple reference coordinate were used to solve the flow field in the moving area and the static area respectively,the influence of add three kinds of baffles on particle volume fraction and velocity field were analyzed,the experimental and numerical results were compared and analyzed.The results show that when the baffle cross-section are rectangular,triangle and semicircle,the volume fraction of particles less than 0.31 in radial-cloud map are 26%,18%,2%respectively;the volume fraction of particles more than 0.37 are 1%,15%,27% respectively;the particles speed more than 0.54 m/s are 45%,20%,40%respectively.Particle axial velocity more than 0.4 m/s area accounted for about 80%,40%,35%.This results express rectangular baffle granulating chamber promoted the mixing of powders and improved the fluidity.
作者
吴南星
邓立钧
赵增怡
余冬玲
江竹亭
廖达海
WU Nan-xing;DENG Li-jun;ZHAO Zeng-yi;YU Dong-ling;JIANG Zhu-ting;LIAO Da-hai(School of Mechanical and Electronic Engineering,Jingdezhen Ceramic Institute,Jingdezhen 333403,China)
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2018年第12期3802-3806,3820,共6页
Bulletin of the Chinese Ceramic Society
基金
国家自然科学基金(KJLD14074)
江西省科技支撑计划(20151BBE50041)
关键词
干法造粒
混合效果
欧拉两相流模型
挡板结构
dry granulation
mixing effect
Euler two-phase flow model
baffle structure
