TY - JOUR
T1 - Numerical study of the thermal response of high-temperature ablative materials
AU - Shih, Y. C.
AU - Cheung, F. B.
N1 - Funding Information:
Received 21 October 1996; accepted 20 June 1997. This work was partially supported by the FMC Corporation. The authors wish to express their sincere thanks to Dr. J. H. Koo of FMC for providing the material properties of H41N and MXBE-350. Address correspondence to Professor Fan-Bill Cheung, Department of Mechanical Engineering, Pennsylvania State University, 137 Reber Building, University Park, PA 16802, USA. E-mail: [email protected]
PY - 1997/11
Y1 - 1997/11
N2 - A theoretical model accounting for the effects of thermal nonequilibrium, temperature-dependent material properties, pyrotysis reaction, and thermochemical expansion is developed to predict the thermal response of high-temperature ablative materials when exposed to hyperthermal environments. The model, which is developed by using the volume-averaging and the finite volume techniques, is applied to predict the thermal response and the underlying heat transfer mechanisms of two typical ablative materials having distinctly different properties. From the numerical results, it is found that the method of mixture enthalpy leads to a better prediction of the thermal response than the method of mixture specific heat. It is also found that for an ablative material with relatively large permeability and porosity, the cooling effect of transpiration gases is significantly overpredicted by using the assumption of local thermal equilibrium.
AB - A theoretical model accounting for the effects of thermal nonequilibrium, temperature-dependent material properties, pyrotysis reaction, and thermochemical expansion is developed to predict the thermal response of high-temperature ablative materials when exposed to hyperthermal environments. The model, which is developed by using the volume-averaging and the finite volume techniques, is applied to predict the thermal response and the underlying heat transfer mechanisms of two typical ablative materials having distinctly different properties. From the numerical results, it is found that the method of mixture enthalpy leads to a better prediction of the thermal response than the method of mixture specific heat. It is also found that for an ablative material with relatively large permeability and porosity, the cooling effect of transpiration gases is significantly overpredicted by using the assumption of local thermal equilibrium.
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U2 - 10.1080/10407789708913906
DO - 10.1080/10407789708913906
M3 - Article
AN - SCOPUS:0031558612
SN - 1040-7782
VL - 32
SP - 555
EP - 574
JO - Numerical Heat Transfer; Part A: Applications
JF - Numerical Heat Transfer; Part A: Applications
IS - 6
ER -