DYNAMICS OF DRYING PROCESSES OF PLANT RAW MATERIAL IN THE PERIOD OF DECREASING SPEED
DOI:
https://doi.org/10.15421/jchemtech.v30i3.259694Keywords:
monodisperse layer; drying kinetics; drying dynamics; mathematical model of dryingAbstract
Removing moisture from plant materials is a necessary production step. A quality drying process improves the storage and transport of plant materials. In the case of extracting moisture from food products, for example, from candied fruits, drying should be organized under special temperature conditions. This allows long-term storage of food products without violating their organoleptic properties. The dynamics of moisture extraction from vegetable raw materials is diverse, however, regardless of the methods and methods of drying, it is the final and energy-consuming stage of production. The article investigates the kinetic dependences of changes in the moisture content of candied pumpkin. As a result, the time dependence of the temperature and moisture content of the thermal agent is obtained. Also, the result of kinetics in dimensionless coordinates is obtained, the analysis of experimental studies has been carried out. The article investigates the dynamic dependence of the change in the moisture content of candied pumpkin. As a result, the dependences of the temperature and moisture content of the thermal agent along the height of the material layer are obtained. Also, the result of dynamic in dimensionless coordinates is obtained, the analysis of experimental studies has been carried out. A physical model of the dynamics of drying in a monodisperse layer, which is dried by filtration of a thermal agent through the layer, is described. The problem of drying dynamics in a layer of monodisperse material of particles of the same shape of a parallelepiped is solved. The solution of the problem involves determining the fields of change in the moisture content of the material and the heat agent as a function of coordinates and time. The limiting condition of the third kind is also determined at the boundary of a solid body-thermal agent. Dependences are derived that make it possible to calculate the moisture content of the material and the heat agent during drying of materials to be dried in the period of decreasing speed and from which capillary bound moisture is released. The generalization of the kinetics and dynamics of drying, the mathematical models proposed in the article for calculating the drying processes, can be used to design, intensify and optimize the operation of drying equipment.
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