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  This research carried out in order to corn kernels drying by using a discontinuous rotary drum dryer. This research evaluated the effect of drying air temperature and velocity of the rotating cylinder parameters on the drying time, breakage percentage, cracking, burn kernels and the disruptive energy of corn kernels. For this purpose, a batch dryer rotating cylindrical drum rotation is designed and developed. Intake air temperature parameter Was considered at four levels of 40, 60, 80 and 100 °C and the drum rotation speed at three levels of 2, 6 and 10 rpm. The results indicated significant interaction effect of temperature and speed rotation cylinder on maize grain drying. The lowest time kernels corn drying and the cylinder rotation speed was at 100 °C and 2 rpm, respectively. With increasing temperature of dryer from 40 to 100 °C, grain drying time is reduced to less than a quarter but; with increasing rotation speed of the cylinder drying time was increases. During the drying process, the interaction of temperature and rotation speed of the cylinder has no significant effect on broken kernels-corn. The maximum percentage of broken grains of corn is in 10 rpm rotation speed. Interaction of temperature and rotation speed of the cylinder is significant at the one percent level on cracked and burned grains. The More of the cracks and burn is in 100 °C temperature and 2 rpm of rotation speed.  

Keywords: rotary drum dryer, Drying, Corn, Drying times, Dryer temperature, Cracks and fractures

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