纤维材料各向异性对蒸汽射流冲击传热传质的影响研究

Influence of anisotropy of fiber material on impact heat and mass transfer of steam jet

服用纤维材料存在各向异性,会在很大程度上影响挂烫机蒸汽熨烫过程中蒸汽射流冲击纤维材料的传热传质,并最终影响熨烫效率和熨烫效果。为探究织物各向异性对熨烫过程中传热传质的影响,选取纯棉机织物为研究对象,以各向同性的涤纶无纺材料为参比,在蒸汽射流冲击熨烫织物过程中,使用红外温度摄像仪记录织物表面的温度分布情况,同时使用CCD摄像机记录纤维材料冷凝水的传输,分析并计算蒸汽熨烫过程中蒸汽射流冲击纤维材料的热力学过程以及传热传质过程。得出结论如下:织物经纬向纱线因结构参数(纱线密度、直径、紧度等)不同所引起的各向异性,会造成在蒸汽射流过程中织物表面温度分布不均匀,以及冷凝水传输不均匀等现象。因此,在未来挂烫机研发时可以考虑通过改变熨烫装置的喷孔设计,从而改变蒸汽作用于织物表面的面积和形状等,以改善织物表面的温度分布情况,使织物表面的温度分布更加均匀。

Due to the anisotropy of fiber materials for wearing, it will greatly affect the heat and mass transfer of the steam jet impinging on the fiber material during the ironing process of the steamer, and ultimately affect the ironing efficiency and ironing effect. In order to explore the influence of fabric anisotropy on the heat and mass transfer during ironing, taking cotton woven fabric as the research object and isotropic polyester non-woven material as a reference, the impacting of steam jet in fabric ironing is studied. An infrared temperature camera is used to record the temperature distribution on the surface of the fabric. The CCD camera is used to record the transmission of condensed water in the fiber material. The thermodynamic process and the heat and mass transfer process of the fiber material impacted by the steam jet during steam ironing are analyzed and calculated. The following conclusions are the anisotropy caused by different structural parameters(yarn density, diameter, tightness, etc.) of the warp and weft yarns of the fabric could cause non-uniform temperature distribution on the surface of the fabric during the steam jet process, as well as non-uniform condensate transport. Therefore, in the future research and development of garment ironing machine, it can be considered to change the design of the orifice of the ironing device to change the area and shape of the steam applied to the fabric surface, thereby improving the temperature distribution on the surface of the fabric and making the temperature distribution on the fabric surface more uniform.