• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>International Journal of Heat and Mass Transfer >Evaluation of a human skin surface temperature for the protective clothing - Skin system based on the protective clothing-skin imitating material results
【24h】

Evaluation of a human skin surface temperature for the protective clothing - Skin system based on the protective clothing-skin imitating material results

机译：防护服的人体皮肤表面温度评估-基于防护服-仿皮材料结果的皮肤系统

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Experimental studies used for evaluation of quality of the fire-fighters protective clothing are based on irradiation of the clothing sample by an external pulse of a given duration. The other side of the clothing sample is in contact with a material imitating the human skin, which has properties different than these of the skin. Therefore the problem considered in this paper was: what conditions should be satisfied to convert the experimental results, carried out on the stand with a skin-imitating material, to the case of the real human skin with different properties for which the experiments are not made? This will allow for better evaluation of the clothing protecting properties and estimation of the possible burns. Due to multilayer structure of the protective clothing and skin as well as complex phenomena involved in energy transfer through them the problem is very complicated. Therefore at the first attempt to solve the problem a simplified two-layer, clothing-skin system irradiated from external heat source was considered in the present paper. Temperature variation in the system was initially determined using the in-house 1D numerical code accounting for heat conduction in the skin and clothing, non-grey thermal radiation absorption, scattering and emission together with the water vapour diffusion and phase transformations of bound water to the gaseous phase in the protective clothing. Then the analytical model for temperature variation in the considered system was proposed and solved using the Laplace transform approach. In the latter model water vapour diffusion with its phase transformations were excluded and radiation emission was neglected. The analytical model allowed for deriving a formula which can be applied for converting the skin surface temperature obtained from the experiments carried out using the skin-imitating material to the material having skin properties. In order to verify the range of validity of the formula the analytical predictions were compared to the results of numerical simulations of temperature in the protective clothing-skin system considering cases in which different phenomena were included. For the majority of the cases studied good matching between analytical and numerical results was obtained for time corresponding to the heating and cooling processes of the protective clothing-skin system.
机译：用于评估消防员防护服质量的实验研究是基于给定持续时间的外部脉冲对防护服样品的辐照。衣物样品的另一侧与模仿人类皮肤的材料接触，该材料具有与皮肤不同的特性。因此，本文考虑的问题是：应满足什么条件才能将使用仿皮材料在架子上进行的实验结果转换为不具有实验性质的具有不同特性的真实人体皮肤的情况？这样可以更好地评估衣物的防护性能，并估计可能的灼伤。由于防护服和皮肤的多层结构以及通过它们传递能量所涉及的复杂现象，因此该问题非常复杂。因此，在首次尝试解决该问题时，本文考虑了从外部热源辐射的简化的两层衣服皮肤系统。最初使用内部一维数字代码确定系统中的温度变化，该数字解释了皮肤和衣服中的热传导，非灰色热辐射吸收，散射和散发以及水蒸气扩散和结合水到水的相变。气相进入防护服。然后提出了所考虑系统中温度变化的解析模型，并使用拉普拉斯变换方法进行了求解。在后一种模型中，排除了水蒸气扩散及其相变，忽略了辐射发射。该分析模型允许推导公式，该公式可用于将由使用皮肤模拟材料进行的实验获得的皮肤表面温度转换为具有皮肤特性的材料。为了验证公式的有效性范围，将分析预测与防护服—皮肤系统中温度的数值模拟结果进行了比较，考虑了其中包括不同现象的情况。对于大多数研究案例，在时间上对应于防护服-皮肤系统的加热和冷却过程，获得了分析结果与数值结果之间的良好匹配。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号