复合纺丝微孔内熔体流动特性研究

Characteristics of the Melt Flow in a Complex Spinning Micropore

从流变学基本理论出发,结合纺丝熔体的流变特性和可纺性原理,通过设定一些基本假设,研究出皮芯型复合纺丝微孔中流动时的速度分布和剪切速率分布的数学模型,然后根据数学模型运用Fluent进行仿真模拟并数值求解,研究了基于复合纺丝微孔的熔体流动特性。结果表明:熔体经过喷丝微孔的速度分布与幂律指数n、熔体初始速度V0、微孔几何尺寸密切相关,并且皮芯型微孔在复合纺丝过程中出口与入口压力,外环与内孔速度都不相同。

We present a mathematical model of the velocity distribution and shear rate distribution for the melt flow in complex spinning sheath-core orifices. Then, according to the mathematical model, we carry out simulation by using the software of Fluent to obtain the numerical solution and study the characteristics of melt flow in complex spinning micropore. The result shows that the velocity distribution of the melt through spinning porous relates close- ly to the power law index n, the initial velocity Vo of the melt and the pore geometry; the pressure of export and import and the speed of the outer and the inner hole are different during the process of the complex spinning