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3D numerical investigation of the heat and flow transfer through cold protective clothing based on CFD

机译：基于CFD的冷防护服热传递的3D数值调查

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摘要

A three-dimensional (3D) model solving the heat and flow transfer through cold protective clothing under various ambient conditions was developed based on the torso thermal manikin in the present work. The conjugate problem of conduction, convection and radiation was simultaneously solved by the proposed model. The air in the computation domain was treated as a uniform turbulent flow, but it was considered as a slow air movement when the air was in the clothing modeled as a homogenous porous structure. Ideal contact between skin and clothing ensemble was assumed to eliminate the effect caused by the air layer enclosed at the gap. Validation study was performed by comparing the numerical results with experimental results obtained from the torso thermal manikin in a climate chamber. A good agreement was found with the maximum difference in heat flux and thermal resistance below 7.4% and 7.8%, respectively. The dependence of various parameters such as ambient temperature, air velocity and clothing thickness on clothing thermal insulation was further clarified by extensive parametric study. The local variations in temperature distribution, radiative and convective heat flux along the clothing outer surface were found to be significant, indicating that a space-average method would withhold the variation between different local positions. The global relative contribution of conduction, convection and radiation under different temperature and windy conditions were also evaluated. Besides, the lowest comfort temperature at activity level 2 met and 4 met was investigated for clothing with different thickness, and the effect exerted from wind was pronounced.
机译：通过在各种环境条件下通过冷防护服求解热量和流动的三维（3D）模型是基于本作工作中的躯干热人体。所提出的模型同时解决了传导，对流和辐射的共轭问题。计算结构域中的空气被视为均匀的湍流，但是当空气中的衣物中被视为均匀的多孔结构时，它被认为是缓慢的空气运动。假设皮肤和服装系列之间的理想接触以消除封闭在间隙处的空气层引起的效果。通过将数值结果与在气候室中的躯干热人体内景中获得的实验结果进行比较来进行验证研究。发现良好的一致性，热量的最大差异和热阻分别低于7.4％和7.8％。通过广泛的参数研究进一步阐明了各种参数如环境温度，空气速度和衣物厚度的各种参数的依赖性。发现沿着衣服外表面的温度分布，辐射和对流热通量的局部变化是显着的，表明空间平均方法将阻止不同局部位置之间的变化。还评估了不同温度和刮风条件下的传导，对流和辐射的全局相对贡献。此外，针对具有不同厚度的衣服研究了活性2级的最低舒适温度和4次遇见，并且从风中施加的效果发音。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2021年第8期|121305.1-121305.13|共13页
  • 作者

    Hua Shen; Yuying An; Huimin Zhang; Fumei Wang; Yu He; Jilong Wang; Lexi Tu;

  • 作者单位

    Donghua University College of Textiles Ministry of Education Shanghai 201620 China;

    Donghua University College of Textiles Ministry of Education Shanghai 201620 China;

    Donghua University College of Textiles Ministry of Education Shanghai 201620 China;

    Donghua University College of Textiles Ministry of Education Shanghai 201620 China Key Laboratory of Textile Science & Technology Ministry of Education Shanghai 201620 China;

    Donghua University College of Textiles Ministry of Education Shanghai 201620 China;

    Donghua University College of Textiles Ministry of Education Shanghai 201620 China;

    Donghua University College of Textiles Ministry of Education Shanghai 201620 China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Cold protective clothing; Porous structure; 3D model; Numerical simulation; Lowest comfort temperature;

    机译：冷防护服;多孔结构;3D模型;数值模拟;最低舒适温度;

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