Budowa i analiza matematycznego modelu procesu konwekcyjnego suszenia cebuli

Przeprowadzono pomiary zmian zawartości wody w cebuli suszonej w warunkach konwekcji swobodnej. Przeprowadzono analizę zmian szybkości suszenia w trakcie trwania procesu. Nie stwierdzono istnienia okresu stałej szybkości suszenia.

The measurements of the time related changes of moisture content (dry basis) in onion while drying under natural convection were conducted. The experiments were carried out on samples consisted of the single onion slices which were of 5 mm. thick. Onion was dried in nine temperatures from 30 to 70°C. The results of measurements were plotted on diagrams. They indicated icreasing of drying velocity according to increasing of temperatures of drying. The measurements of thickness and diameter indicated greater changes of the second. Analysing of changing the rate of drying was performed. The whole time needed to dry was divided into three periods with respect to changing of the rate of drying. The first and the last periods indicated its linear and the second period square changing. Rate of drying increased with the temperature of drying and the psychrometrie difference.