Heat and moisture transfer in high-property refractories under the intensive heat flux or fire exposure

摘要

This paper described a one-dimensional cylinder numerical model of heat and moisture transfer in a cylinder sheathed by high-property refractories under the intense heat flux or fire exposure. Bio-heat transfer equation and Henriques burn skin equation were introduced to predict second-degree skin burn injuries based on the numerical model. A cylindrical thermal protective performance testing device was used to measure the distribution of temperature. The effects of moisture content on the thermal protective performance were also discussed. The aim of this study was to predict the thermal protective performance of flame-resistant refractories under the intensive heat flux or fire. Two sets of high-property refractories, which were often used for firefighter clothing, were selected to verify the accuracy of model. Four sets of experiments were conducted based on the former findings. The performance of the related models had been evaluated by comparing the predicted values with the respective experimental values. Results showed that the predicted values from the numerical models approach satisfactorily the experimental results. Therefore, the predicted model can be used to specify the level of protection needed in a garment when the intensity of the exposure hazard is known. Also, the test will be especially useful for developing new materials and selecting candidates for additional field testing.