Capillary flow of liquid water through yarns: a theoretical model
Capillary flow of liquid water through yarns: a theoretical model
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DOI：
10.1177/0040517514555797
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发表时间：
2015-05-01
影响因子：
2.3
通讯作者：
Gong, Hugh
中科院分区：
文献类型：
--
作者：
Almoughni, Hend;Gong, Hugh
在极端天气条件和人体活动水平下，汗水蒸发对于维持感官和热舒适度至关重要。制造贴身衣服的织物通过毛细管流动和蒸发机制，在促进体液汗液从皮肤转移到环境方面发挥着重要作用。这项工作是对纱线水流特性与其结构几何形状和成分纤维化学相关的理论和实验研究。提出了预测液态水通过纱线的毛细管流动的理论模型。该模型基于 Kozeny-Carman 方程，该方程根据水力半径理论表示纤维间孔隙。棉纱、涤纶纱和棉/涤纶纱是通过系统地改变不同的生产参数来生产的，包括纤维类型、纱线捻度、纱线线密度和混纺比。生产平纹针织织物并测试从生产的织物中取出的纱线的液态水的水平线性流动。实验结果与基于理论模型的估计结果具有很强的相关性。该模型预测，随着纱线内纤维间孔隙空间面积与总纤维周长之比的增加，流速预计会增加。
In extreme weather conditions and activity levels of human subjects, evaporation of sweat is critical for maintaining the sensorial and thermal comfort. Fabrics, from which clothes worn next to the skin are made, play an important role in facilitating the transfer of body liquid perspiration away from the skin to the environment through the mechanisms of capillary flow and evaporation. This work is a theoretical and experimental investigation of water flow characteristics of yarns with relevance to their structure geometry and constituent fiber chemistry. A theoretical model to predict the capillary flow of liquid water through yarns was proposed. The model is based on the Kozeny-Carman equation, which represents interfiber pores in terms of the hydraulic radius theory. Cotton, polyester and cotton/polyester yarns were produced by systematically varying different production parameters, including fiber type, yarn twist, yarn linear density and blend ratio. Plain knitted fabrics were produced and yarns taken from the produced fabrics were tested for horizontal linear flow of liquid water. The experimental results showed a strong correlation with the estimated results based on the theoretical model. The model predicts that as the ratio of interfiber pore space area to the total fiber perimeter within yarn increases, the flow rate is expected to increase.