当前位置: X-MOL 学术J. Ind. Text. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Theoretical prediction and experimental characterization of radiative properties and thermal conductivities of fibrous aramid fabrics
Journal of Industrial Textiles ( IF 3.2 ) Pub Date : 2021-04-04 , DOI: 10.1177/15280837211006209
FL Zhu 1 , Yonggui Li 2
Affiliation  

Nonwoven aramid fabric is widely used as thermal barrier of fireproofing clothing due to its inherent flame retardancy and light weight. In fire or high temperature scenario, radiative heat transfer becomes the predominant heat transfer mode inside firefighters’ clothing. In this work, Fourier transform infrared spectroscopy (FTIR) was adopted to measure the spectral transmittance and spectral extinction coefficients of four aramid fabrics with different porosity in infrared wavelength range between 2.5 and 25 μm. It was found that the radiative properties of fibrous aramid fabric are strongly dependent on its bulk density or porosity. The spectral extinction coefficient decreases with increasing porosity or decreasing bulk density. The infrared optical properties combined with infrared imaging measurements demonstrate that aramid fabric may be used as infrared semi-transparent textile. A predicted model, combined the effects of conduction-radiation heat transfer, has been developed to calculate the effective thermal conductivity of aramid fiber materials. The model implemented the Rosseland diffusion approximation to evaluate radiative thermal conductivity, and the Parallel-Series structural model to evaluate tortuosity-weighted phonic thermal conductivity. The predicted results were also compared with experimental data obtained from TPS method. This work provides useful information for future studies of heat transfer mathematical modeling of firefighters’ clothing.



中文翻译:

芳纶纤维织物的辐射性能和热导率的理论预测和实验表征

非织造芳族聚酰胺织物因其固有的阻燃性和重量轻而被广泛用作防火服装的隔热层。在着火或高温的情况下,辐射热传递成为消防员衣服内部的主要热传递方式。在这项工作中,采用傅立叶变换红外光谱(FTIR)来测量在2.5至25μm的红外波长范围内四种具有不同孔隙率的芳纶织物的光谱透射率和光谱消光系数。已经发现,芳族聚酰胺纤维织物的辐射性能强烈地取决于其堆积密度或孔隙率。光谱消光系数随着孔隙率的增加或堆积密度的降低而降低。红外光学性能与红外成像测量结果相结合,证明芳纶织物可用作红外半透明纺织品。结合传导-辐射热传递的影响,建立了预测模型,以计算芳纶纤维材料的有效导热系数。该模型执行Rosseland扩散近似来评估辐射热导率,并使用平行系列结构模型来评估曲折度加权的声子热导率。还将预测结果与通过TPS方法获得的实验数据进行了比较。这项工作为将来研究消防员服装的传热数学模型提供了有用的信息。结合传导-辐射热传递的影响,已经开发出用于计算芳族聚酰胺纤维材料的有效导热率。该模型执行Rosseland扩散近似来评估辐射热导率,并使用平行系列结构模型来评估曲折度加权的声子热导率。还将预测结果与通过TPS方法获得的实验数据进行了比较。这项工作为将来研究消防员服装的传热数学模型提供了有用的信息。结合传导-辐射热传递的影响,已经开发出用于计算芳族聚酰胺纤维材料的有效导热率。该模型执行Rosseland扩散近似来评估辐射导热率,并使用Parallel-Series结构模型来评估曲折度加权的声导热率。还将预测结果与通过TPS方法获得的实验数据进行了比较。这项工作为将来研究消防员服装的传热数学模型提供了有用的信息。并使用Parallel-Series结构模型评估曲折度加权的声导热率。还将预测结果与通过TPS方法获得的实验数据进行了比较。这项工作为将来研究消防员服装的传热数学模型提供了有用的信息。并使用Parallel-Series结构模型评估曲折度加权的声导热率。还将预测结果与通过TPS方法获得的实验数据进行了比较。这项工作为将来研究消防员服装的传热数学模型提供了有用的信息。

更新日期:2021-04-05
down
wechat
bug