Abstract To investigate the distribution characteristics of the three-dimensional flow field under the slot die, an online measurement of the airflow velocity was performed using a hot wire anemometer. The experimental results show that the air-slot end faces have a great influence on the airflow distribution in its vicinity. Compared with the air velocity in the center area, the velocity below the slot end face is much lower. The distribution characteristics of the three-dimensional flow field under the slot die would cause the fibers at different positions to bear inconsistent air force. The air velocity of the spinning centerline is higher than that around it, which is more conducive to fiber diameter attenuation. The violent fluctuation of the instantaneous velocity of the airflow could easily cause the meltblowing fiber to whip in the area close to the die.

中文翻译：

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熔喷槽模三维流场实验研究

摘要 为研究狭缝模具下三维流场的分布特征，采用热线风速计在线测量气流速度。实验结果表明，气槽端面对其附近的气流分布有很大的影响。与中心区域的空气速度相比，槽口端面下方的速度要低得多。缝模下三维流场的分布特性会导致不同位置的纤维承受不一致的空气力。纺丝中心线的风速高于其周围的风速，更有利于纤维直径的衰减。