DRYING CHARACTERISTICS OF SWEET-POTATO

The drying test of sweet potato has been done at the air conditions of 40, 50, 60, and 75 degrees C, in order to investigate the drying char acteristics. In this study, three types of drying periods, the constan t rate drying period, the first falling rate drying period, and the se cond falling rate drying period, was found during drying. With regards to this, three drying equations, the modified constant rate drying eq uation, the first falling rate drying equation, and the second falling rate drying equation were applied to the observed drying curve (moist ure ratio vs. time) for each drying period respectively. Result shows that the calculated values have a good agreement with the data. Furthe rmore, it revealed that drying constants in first and second falling r ate drying period have Arrhenius type temperature dependency.