Simultaneous retrieval of high temperature thermal conductivities, anisotropic radiative properties, and thermal contact resistance for ceramic foams

摘要

Open-cell ceramic foams exhibit outstanding thermal, mechanical and exchange properties that make them widely used in various industrial areas with high temperature hostile environments. Deficiency in reliable high temperature thermal properties as well as interface contact attributes brings demanding challenges to precise design and optimization of foams in conditions of usage. Aiming at this problem, the present paper interests in the determination of multiple high temperature thermal parameters for description of conduction and radiation transports taken place within the material as well as contact behaviors between ceramic foams, by inverse identification technology. The thermal contact effect arising from introduction of thermocouples in temperature measurements for ceramic foams was modelled in a new thermal model. On basis of the renewed heat transfer model, three categories of thermal parameters, i.e. conductive properties, anisotropic radiative properties, and thermal contact resistance, were simultaneously reconstructed from a simple and rapid transient thermal measurements. The reliability of the estimated thermal parameters was discussed by comparison with experimental measurements and literature data. It was found that the proposed inverse model demonstrates good behavior to determine critical thermal properties information as well as thermal resistance effect.