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Vapor Breakthrough from Liquid Drops Impacting Air-Permeable Chemical Protective Fabric

机译:液滴对蒸气渗透性化学防护织物的影响会产生蒸气突破

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摘要

The interaction between drop impact and vapor breakthrough for several kinds of air-permeable fabric composites (an outer shell with an adsorbent liner) is determined under convective flow conditions. Vapor breakthrough is measured using methyl sali-cylate, a chemical agent simulant, for static and dynamic liquid drop placement on either the shell fabric alone or in combination with an activated carbon-loaded foam liner backing. Vapor concentration, detected by means of a photo-ionizer, is used to determine breakthrough curves, while image analysis provides a quantitative characterization of the impact behavior of the liquid drops by measuring liquid spreading, splashing, and breakthrough. Drop impact velocities up to 6 m/s are measured on cotton/Kevlar~®ylon and cottonylon twill weave outer shell fabrics. For static drops, fabric composites with an outer wicking fabric give much lower total vapor breakthrough than do nonwicking fabrics, whereas for dynamic drops at subterminal impact velocities, the difference between nonwicking and wicking shell fabrics is reduced because of surface spreading and splashing. There is an inverse correlation between wetted area and vapor breakthrough due to localized vapor saturation of the adsorbent liner fabric. Below a critical drop velocity of 4.5 m/s, there is no direct liquid penetration through the shell fabric.
机译:在对流流动条件下,确定了几种透气性织物复合材料(带有吸附衬里的外壳)的液滴撞击和蒸汽穿透之间的相互作用。使用水杨酸甲酯(一种化学模拟剂)测量蒸汽穿透,以将静态和动态液滴放置在单独的壳织物上,或与装有活性炭的泡沫衬里一起使用。借助光电离器检测的蒸气浓度可用于确定穿透曲线,而图像分析可通过测量液体的散布,飞溅和穿透来定量描述液滴的冲击行为。在棉/Kevlar®/尼龙和棉/尼龙斜纹编织外壳面料上测得的落落冲击速度高达6 m / s。对于静滴,具有外部芯吸织物的织物复合材料的总蒸气穿透性要比非芯吸织物低得多,而对于副末端冲击速度下的动态液滴,由于表面散布和飞溅,非芯吸和芯吸壳织物之间的差异减小了。由于吸附衬里织物的局部蒸汽饱和,润湿面积与蒸汽渗透之间存在反相关关系。低于临界滴落速度4.5 m / s时,液体不会直接穿过外壳织物。

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