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Describing of generalized drying kinetics with application of experiment design method

Efremov G.

Technical Sciences / University of Warmia and Mazury in Olsztyn

2013

nr 16(4)

309--322

The purpose of this article is an application of experiment design method for describing of generalized drying kinetics. Generalized kinetic equation for the first drying period as the linear dependence of the material moisture content vs. drying time and temperature is obtained. For determination of generalized kinetic equation the limited number of experimental data (only two moisture contents of a material for two temperatures of drying agent) is needed. The comparison of calculations of generalized kinetic equation with experimental data for convection drying of sludge and for convectional drying of cotton fabric in the first drying period are fulfilled. The mathematical modification of the two-period model of drying kinetics over the entire drying process is obtained. This modified model permits to avoid of the determination of a characteristic drying time. The comparison of drying kinetic calculations with experimental data for convection drying of sludge in the first and second drying periods for four temperatures using of experiment design method was fulfilled. As follows from calculations, the experimental data of sludge correspond well to the lines obtained through the factorial design which means that this method can successfully be used to determine constant drying rates, total kinetics and the influence of temperature in drying process.