熔喷三维气流场的数值计算与分析

为探究双槽形熔喷模头喷气孔端面对空气流场特征和纤维拉伸工艺的影响,对熔喷三维流场进行数值分析。采用Gambit建立了双槽形熔喷模头的结构模型,应用Fluent软件对熔喷三维气流场进行数值计算,分析流场中的速度、温度和压强分布规律及喷气孔端面对纤维制备的影响。结果表明:喷气孔端面对流场分布有一定影响,若远离流场中心,纺丝线上的速度和温度开始下降,而静压值变化较小;流场中心附近处纺丝线上的速度、温度和压强分布差别很小,靠近喷气孔端面的纺丝线上的温度、速度和静压最低;双槽形模头流场不同位置纺丝线上速度、温度和压强的不同导致制备的熔喷纤维在性能等方面存在差异。

Numerical calculation and analysis of three-dimensional flow field in melt-blown process

In order to study the influence of the end face of the gas-slot in the melt-blown die on the air flow field and the fiber drawing process, a three-dimensional flow field was numerically analyzed. The structural model of the slot die was established by Gambit. The Fluent software was adopted to numerically calculate the three-dimensional flow field from the slot die, and the velocity, temperature and pressure distribution in the flow field were analyzed. The results show that the end face of the gas-slot has a certain influence on the flow field distribution. As the distance from the center of the flow field increases, the velocity and temperature on the spinning line decreases, and the static pressure changes little. The velocity, temperature and pressure distribution on the spinning line near the center of the flow field are very small. The temperature, velocity and static pressure on the spinning line near the end face of thegas-slot are the lowest. The distribution characteristics of the three-dimensional flow field causes differences in fineness and performance of the melt-blown fibers.