基于微波加热的沥青混合料传热传质关键模型

sphalt mixtures are simplified to porous media to research heat and moisture transportation law based on multiphysics transfer process of microwave heating. Models of electromagnetic diffusion and heat transfer of asphalt mixtures are built. Heat and mass transfer law is researched, and it is proved to be able to predict the basic law of recycling according to microwave heating experiments. It is found that pressure gradient increases with the rising of heating temperature. Temperatures of center heating area are found higher than those of surrounding area through simulation of temperature fields. Temperature risings of moistures lag behind those of asphalt mixtures by analyzing temperature change of moistures. The results can simulate technical process of hot in-place recycling and provide the theory basis for structure design of heaters.