Speaker
Description
Heat transfer in porous media involves all aspects of production and life, and the porous media has fractal characteristics. Based on the porous media REV (Representative Elementary Volume) description analysis method, two microphysical models of porous media were established: the heat transfer model of hollow skeleton and the heat transfer model of solid particle. Combined with fractal theory, the hollow skeleton element model and solid particle element model are characterized by fractal description, and a model for calculating the fractal thermal conductivity considering structural characteristic parameters (such as porosity, and fractal dimension, etc.) is given. According to the proposed model, the effect of relevant parameters on the thermal conductivity characteristics of calcium silicate was analyzed as an example. The experimental verification was carried out by the self-developed experimental device, and the results showed that the fractal heat transfer models have a more detailed microscopic description of the porous media than the original heat transfer models, and can more sensitively and accurately describe changes in thermal conductivity caused by changes in porosity caused by structural changes in porous media. As the porosity decreases and the fractal dimension increases, the solid matrix gradually occupies the porous medium, the continuity of the solid matrix gradually increases in space, and the thermal conductivity increases.
| Country | China |
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