On the basis of Fick diffusion model and conduction model, considering the effects of heat and moisture diffusion, direct evaporation of water and internal heat source, the internal mass and heat transfer model of microwave drying yellow peach was obtained. The model is simulated by explicit finite difference method, and the calculated values are basically consistent with the measured values.
yellow peach, model
In the past, most of the mass and heat transfer models used Fick diffusion law and transfer equation directly in the study of drying of agricultural materials. In the model, the effects of temperature gradient on water diffusion and evaporation on temperature change are neglected, and the mass and heat parameters are assumed to be constant. These will lead to great limitations in model and simulation conclusions.
Microwave drying of fruits and vegetables is very fast, and its mechanism is different from that of hot air drying. There are moisture vapor diffusion and heat-humidity effects in drying materials, but no such mass-heat model has been reported. In this paper, a mathematical model for microwave drying of internal heat transfer in yellow peach is established and numerical simulation is carried out.
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