This article deals with simulation and analytical solution of the problem of wet material drying under the action of a plane electromagnetic wave of the microwave range. The mathematical model of microwave drying is considered at two stages: the heating stage and the drying stage. The temperature field of the material in the mode of heating, under the absorption conditions of microwave radiation according to the Beer–Lambert law, is found analytically, strictly with the use of the Fourier and Laplace transforms. In time, the first stage ends at the moment when the maximum temperature inside the material reaches the temperature of the water-vapor phase transition. The drying process is studied as heat transfer in a three-phase medium with two unsteadily moving boundaries of phase transformations, the rate of which is not known in advance and is determined from the Stefan balance ratio. The temperature distribution in this regime is found analytically with the use of asymptotic procedures. In addition, important characteristics such as drying time, drying temperature, drying speed, and other parameters needed for practical applications are found.
|Журнал||Interfacial Phenomena and Heat Transfer|
|Состояние||Опубликовано - 1 янв 2018|