This work aimed at studying the effects of temperature and air flow rate on heat transfer coefficient during the forced air drying of onion slices. The weight losses in 5 mm thick onion slices were determined during the drying at 40, 45, 50, 55, 60 and 65°C and 0.7, 0.9 and 1.1 m/s air flow rates. Each experiment lasted 2 h. The heat transfer coefficient was calculated based on the empirical results and a mathematical model for the constant drying rate period of the forced air drying of solid materials. No functional relationship was found between the air temperature and heat transfer coefficient for onion slices under the forced convection drying conditions. The heat transfer coefficient ranged from 16.3 to 21.0 W/(m2.K), and it increased with the air flow rate.
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.