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Experimental study of moisture role and heat transfer in thermal insulation fabric against hot surface contact
International Journal of Thermal Sciences ( IF 4.5 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.ijthermalsci.2020.106501
Yun Su , Jie Yang , Rui Li , Guowen Song , Jun Li

Abstract Understanding of moisture role and heat transfer in thermal insulation fabric was crucial for improving thermal protective performance of the fabric against hot surface contact. The hot contact tester was used to measure the heat transfer in “hot surface-fabric-skin simulant sensor”. Two new indexes were proposed for investigating the effect of moisture content on the transmitted and stored energy. The moisture in the fabric presented different roles for four stages that were divided into sharply increase, stable state, slowly increase and decrease according to the changes of skin temperature. The energy storing efficiencies for these fabrics ranged from 4.1% to 20.7%. The moisture in the fabric increased the energy storing efficiencies, which decreased the heat transfer rate during the heat exposure. The discharging thermal energy previously presented an increase and then decreased over the moisture content. However, the moisture reduced the energy discharging efficiencies, thus enhancing the cooling after the heat exposure. The conclusions from this study would contribute to understanding the moisture effect on the heat transfer for improving the protective level of thermal insulation fabric.

中文翻译:

隔热织物对热表面接触的水分作用及传热实验研究

摘要 了解隔热织物中的水分作用和传热对于提高织物对热表面接触的热防护性能至关重要。热接触测试仪用于测量“热表面-织物-皮肤模拟传感器”中的传热。提出了两个新指标来研究水分含量对传输和储存能量的影响。织物中的水分根据皮肤温度的变化呈现出急剧上升、稳定、缓慢上升和下降四个阶段的不同作用。这些织物的储能效率在 4.1% 到 20.7% 之间。织物中的水分提高了能量储存效率,从而降低了热暴露过程中的传热率。释放的热能先前呈现出随着水分含量的增加然后减少。然而,水分降低了能量释放效率,从而增强了受热后的冷却。本研究的结论将有助于了解水分对传热的影响,从而提高隔热织物的防护水平。
更新日期:2020-10-01
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