Abstract In radial flow impregnation of textile preforms, unsaturated experimental studies indicate the presence of an edge flow along the surface of a mold. Instead of a liquid front which is straight and perpendicular to mold surfaces, a complex front profile is observed causing the delayed impregnation in the middle of the preform thickness in comparison with the front position at its surface. This phenomenon becomes of special importance when permeability values are measured by observation of the front at the surface of a mold since they do not represent the impregnation at the mid-plane of the preform leading to errors in permeability measurements. In the past, several theories have been developed to describe the phenomenon of race-tracking. Our study compares theoretical predictions with the experimentally observed data on the width of the front profile. It is found that a crucial role in the formation of the front profile is played by the capillary flow through the thickness of the preform.

中文翻译：

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恒压径向喷射下的边缘流动剖面：分析预测与实验

摘要 在纺织品预成型件的径向流动浸渍中，不饱和实验研究表明沿模具表面存在边缘流动。与直的和垂直于模具表面的液体前沿不同，观察到复杂的前沿轮廓会导致在预制件厚度中间与其表面的前沿位置相比延迟浸渍。当通过观察模具表面的前部测量渗透率值时，这种现象变得特别重要，因为它们不代表预制件中间平面的浸渍，导致渗透率测量出现错误。过去，已经发展出多种理论来描述赛跑现象。我们的研究将理论预测与前部轮廓宽度的实验观察数据进行了比较。已经发现，通过预制件厚度的毛细管流动在前轮廓的形成中起关键作用。