Mathematical and computer models of the change of the parameters of the grain layer during the movement of the grain through the microwave and convection zone

Abstract

In the process of drying the grain in a dense layer in motion, the grain moves through the grain dryer. The movement of the grain layers is usually uneven. In addition, it is likely that the temperature and consumption of the desiccant agent will not remain the same throughout the height of the drying zone. The specific power of the microwave field in the drying zone can also alter. All these factors affect the speed and uniformity of drying of the grain layer throughout the drying zone.
In the first stage, an analysis of the theoretical studies on the subject was carried out. It was determined that to date there has not been presented any work in which mathemati-cal models of heat and humidity exchange in a dense layer of grain in motion with con-sideration of the relative vertical movement of the layers. Therefore, it is necessary to develop such a mathematical model.
As an initial configuration for the development of a mathematical description of the drying process, it was deemed appropriate to use the configuration of the microwave and convection zone developed by the authors.
The equal probability of combination of parameters of the desiccant agent temperature, its relative humidity, the velocity and distance from the caryopsis to the waveguide was assumed. From this point, we developed a computerized microwave and convection drying model that takes into account this type of change in the parameters.
The results of the grain drying simulation demonstrated the efficiency of the computer model obtained, reflecting the influence of fluctuations in grain parameters and the microwave field in the drying process.
To evaluate the accuracy of the obtained model, it is necessary to carry out experimental studies.