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首页> 美国卫生研究院文献>Polymers >Mechanism of Heat Transfer through Porous Media of Inorganic Intumescent Coating in Cone Calorimeter Testing
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Mechanism of Heat Transfer through Porous Media of Inorganic Intumescent Coating in Cone Calorimeter Testing

机译：锥形量热仪中无机膨胀涂层多孔介质传热的机理

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摘要

This work discusses the heat transfer process through a particular form of porous media: an inorganic-based intumescent coating in full-expansion state. Although the thermal mechanism in porous media has been vigorously studied for polymeric/ceramic/metallic foams, less information is available on its application with intumescent-type polymers. This examination demonstrates the procedure of (1) the optimisation of the coating’s internal multicellular structure for numerical modelling, based on topological analyses; (2) the finite element simulation for the coating-sample tested with cone calorimetry; and (3) the quantitative evaluation of the thermal insulation performance of its porous structure by adopting effective thermal conductivity. The modelling technique was verified using measurable data from the cone calorimeter tests. Consistent agreement between the numerical predictions and experimental measurements was achieved over the whole steel-substrate temperature history, based on the clarified thermal boundaries of the specimen and modelling of the combined conduction-radiation transfer. This numerical approach exhibits the impacts of porosity, pore-size, and external thermal load on the medium’s performance, as well as the individual contributions of the component heat transfer modes to the overall process. The full understanding of this thermal mechanism can contribute to the enhancement and optimisation of the thermal insulation performance of a porous-type refractory polymer.
机译：这项工作讨论了通过特殊形式的多孔介质进行传热的过程：一种完全膨胀状态的无机基膨胀型涂层。尽管已经针对聚合物/陶瓷/金属泡沫对多孔介质中的热机理进行了深入研究，但有关其与膨胀型聚合物一起使用的信息很少。这项检查演示了以下过程：（1）基于拓扑分析，优化涂层内部多细胞结构以进行数值建模； （2）用锥形量热法对涂层样品进行有限元模拟； （3）采用有效的导热系数定量评价其多孔结构的绝热性能。使用来自锥形量热仪测试的可测量数据验证了建模技术。在明确的试样热边界和组合的传导-辐射传递模型的基础上，在整个钢-基底温度历史上，数值预测和实验测量之间取得了一致的一致性。这种数值方法展示了孔隙率，孔径和外部热负荷对介质性能的影响，以及组分传热模式对整个过程的贡献。对这种热机理的充分理解可以有助于提高和优化多孔型耐火聚合物的绝热性能。

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