MODELING OF CONVECTIVE DRYING PROCESS DISPERSE MATERIAL IN GRAVITY-MOVING MONOLAYER AT MICROKINETIC LEVEL

A.A. Shevtsov, T.N. Tertychnay, S.S. Kulikov
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Abstract: The nonlinearity of the differential equations of thermal mass transfer of A.V. Lykov and the difficulty in experimentally determining the unknown coefficients included in them do not allow us to obtain an analytical solution, which is due to the dependence of transfer coefficients on the temperature and moisture content of material. Known analytical solutions are obtained only for canonical bodies (plate, cylinder, ball). However, these solutions are cumbersome and complex in structure, which hinders their practical application. To build a mathematical model of the convective drying process, simplifying assumptions are formulated in the work: the shape of the particle was considered in the form of an unlimited cylinder; neglected axial WLA, thermodiffusion, thermal conductivity of an individual particle. The use of theoretical methods of microkinetics of continuous drying of dispersed materials, based on the description of the kinetics of drying of single particles, formulated simplifications, initial and boundary conditions, made it possible to obtain a sys-theme of differential equations in dimensionless form, describing the process of drying of a single particle during direct-flow countercurrent blowing of a drying agent through a gravitational-moving monolayer of a highsutured material. This system of equations is simplified (temperature gradients, thermodiffusion, distribution of the heat source in the particle itself are not taken into account) and solved by the Runge-Kutt method of the fourth order of accuracy. A graphical interpretation of the simulation results is given on the example of drying of flax seeds, which has been widely used in the production of technical oil. The mode error does not exceed 12.5 %.
Index terms: simulation, microkinetics, drying, disperse material

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