异形喷丝孔壁面条件对纺丝液流动过程的影响  

Effect of profiled spinneret hole wall on flow process of spinning solution

作　　者：邓钢[1] 赵昕[1] 张清华[1] 

机构地区：[1]东华大学材料与工程学院纤维材料改性国家重点实验室,上海201620

出　　处：《合成纤维工业》2015年第5期57-61,共5页China Synthetic Fiber Industry

基　　金：国家973计划项目(2014CB643603);国家自然科学基金(NSFC 51233001;51173024)

摘　　要：基于广义Navier模型建立了三叶形喷丝孔的全三维模型,用于分析异形喷丝孔内壁粗糙程度对纺丝液流动过程的影响,并对聚酰胺酸/二甲基乙酰胺(PAA/DMAC)体系纺丝液在异形喷丝孔内的粘弹性流动过程进行了模拟,分析了不同壁面滑移系数(Ks)条件下纺丝液的流动状态和速度分布。结果表明:减少壁面粗糙度,Ks减小,纺丝液在喷丝孔内流动的径向速度分布更趋均匀,但沿长轴和短轴方向的径向速度分布变化并不完全一致;纺丝液沿喷丝孔轴向的最大速度随Ks减小相应降低,Ks为1×108和1×105时,最高轴向速度分别为17.4,9.0 m/s。A full throe-dimensional model of trilobal spinneret hole was built based on a generalized Navier model to analyze the effect of the roughness of profiled spinneret hole inner wall on the flow process of spinning solution and was used to simulate the viscoelastic flow process of polyamide acid/dimethylacetamide （PAA/DMAC） spinning solution in profiled spinneret hole. The flow state and velocity distribution of the spinning solution were analyzed under differont wall slip coefficient （ Ks ）. The results showed that the radical flow velocity distribution of the spinning solution tended to be more uniform in spinneret hole while decrea- sing the wall roughness and Ks , but the change of radical flow velocity distribution was not completely consistent along long axis and short axis; the maximum axial flow velocity of spinning solution was decreased with the decrease ofK , which was 17.4 and 9.0 m/s as Ks was 1 × 10^8 and 1×10^5, respectively.

关 键 词：异形喷丝孔 壁面滑移 粘弹性流动 模拟 

分 类 号：TQ340.1[化学工程—化纤工业]