Abstract
The microstructure of the carbonized layer of the low-density resin-based ablative thermal insulation material is observed, and multiscale unit cell models are established for the residual carbon deposition mode of a carbonization process, and then the thermal conductivity coefficient is predicted using the finite element method. The heat transfer characteristics of a carbonized material are discussed and studied. The results show that among the several models established, the thermal conductivity coefficient obtained by the cross-linked model of matrix carbonization is more accurate, and the deviation compared with the experimental results is within 20%, which is more consistent with the actual heat transfer mechanism. At the same time, the finite element random model is used to predict the thermal conductivity coefficient. The results show that the deviation between the numerical results and the experimentally measured thermal conductivity coefficient of the carbonized layer is within 10%, showing that the accuracy of the finite element random model is significantly higher than that of the dual-scale unit cell model. The carbon deposition model can accurately predict the heat transfer characteristics of the carbonized layer.
Highlights
In order to analyze the microstructure of carbonized layers, some scholars prepared a kind of insulation material called the EPDM (Ethylene-Propylene-Diene Monomer) and made some research about the microstructure of the original and carbonized layers [9,10,11,12,13]
For the carbonized layer of the three kinds of resin-based ablative material, the deviation of the thermal conductivity coefficient between the prediction results and the experimental results is within 10%, which indicates that the established finite element random model can accurately predict the heat transfer characteristics of the carbonized layer
Three numerical models based on unit cell representation are developed, and the thermal conductivity coefficients are gotten by finite element methods
Summary
In order to analyze the microstructure of carbonized layers, some scholars prepared a kind of insulation material called the EPDM (Ethylene-Propylene-Diene Monomer) and made some research about the microstructure of the original and carbonized layers [9,10,11,12,13]. Characterization facilities such as the SEM (scanning electron microscope), TEM (transmission electron microscope), and cone calorimeter were often used to study the microstructure of the thermal insulation material [14, 15]. The depositional mode after carbonization and the heat transfer characteristic in mesoscopic scale at room temperature of the thermal insulation material are necessary to be studied
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