Corn Drying by a Rotary Dryer: A Mathematical Model and Drying Strategy

Abstract

The objectives of this study are to investigate appropriate operating conditions and to develop a mathematical model for corn drying by a rotary dryer. Experimental results showed that if feed rate, rotating speed, tilt angel of drum or air velocity increased, residence time decreased. Residence time obtained from a developed equation was agreeable with experimental result. A thin layer drying equation confirmed by equations of mass and energy balance could predict drying rate relatively well. Energy consumption varied inversely with hold-up and moisture content of corn. A volumetric heat transfer coefficient depended on hold-up, rotating speed and air velocity. To dry corn with a rotary dryer, a relatively high air temperature and high value of hold-up should be practiced. Drying at a range of low moisture content of corn should be avoided.