A system of differential equations enabling simulation of contact/convection dehydration of potato-puree in slowly circulating inert material bed was developed. The equations make possible prognosticating temperatures within the inert material balls and in superficial coating of potato-puree as well as prognosticating moisture content within the entire volume of the coating. The agreement between test results and the simulation based calculations was verified.
Authors present the influence of grain substitute diameter, dz, inert material ball diameter, Di, air flow velocity, U, and bed height, S, on the air flow resistance, ∆P, through the layer of inert material mixed with grain. The tests were run on dry rape seed, wheat, corn, and field pea. Porcelain balls of .025 m and .030 m diameter and polypropylene balls of .035 m and .0375 m diameter were used as inert material. The relationship of ∆P vs. Di, U, and S was described by a dimensionless equation.
The model of a ring-shaped drying chamber was used to simulate wheat grain drying with air heated by "funnel" walls of a drum dryer. Moisture transfer between air and the grain surrounding it, has been described by the diaensionlese equation: Shr = С . Xa . Ref . Zg . Sc*h
Changes in lenght, width and thickness of maize grain as well in its section area during drying were determined on experimental stands. Substantial differences in dynamics of changes these dimensions during particular drying phases were proved. Changes in dimensions depending on grain moisture content (dry basis) are described by the equations.
The model of a cylindrical sieve drying chamber was used to simulate wheat grain heating with air heated by funnal walls of a drum dryer. Heat transfer between the wall of funnel and "the grain jacket" surrounding it has been described by the dimensionlese equation: Nu = С . X a . Re t . Z g.
On the experimental equipment it has been investigated the contact heating of wheat grain in the packing of porcelain balls. The heat transfer between the heat balls and grains has been described by the dimensionless equation.
This paper presents the possibility of using the computer program EUREKA to the teaching of flow problems in the pipes. It is very convenient especialy for the branching pipes, because it solves the complex of 24 equation. Nith the conventional methods, the versatile analysis of such problems, for the didactic purpose, is realy unpossible. Certainly, for the single pipes, with different diameters, this program is very usefull too.
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