Numerical Simulation And Experimental Research Of Freezing Process Of Heat Conduction Dominated Porous Media

Heat and mass transfer during freezing process of porous media is one of the most important research projects, for it is widely used in the field of agriculture, industrial production, biomedical technology and food freezing. This study probes into the freezing process of heat conduction dominated porous media and reveals the freezing curve of temperature and mass utilizing the numerical simulation software.Up to now, numerous researches have been conducted on the solid-liquid phase change of the freezing process of porous media and have put forward various analysis methods. This thesis works out the integral solution on the basis of Neumann Solution.The definition of the geometrical structure and thermal properties of porous media has been a nodus in the heat and mass transfer researches. Moreover, the heat transfer is usually accompanied with the mass transfer in the freezing process. This thesis, using the volume-average method and the effective coefficient of heat conduction method, puts forward a new, comprehensible model of heat and mass transfer for the freezing process of heat conduction dominated of porous media, which takes variable thermal properties and mass transfer into consideration.In order to validate the precision of numerical simulation, this thesis researches the freezing of pork and soil, obtaining the temperature signals with the copper constantan thermocouple and numerical collection system, and weighing the mass with a balance. The experimental data show agreement with the results of numerical simulation. Hence, this thesis provides enlightening references for future research of freezing process in porous media.