Thin Layer Modelling of Celery Leaf Under Vibrating Fluidized Bed Drying Process

Celery has been use widely in herbal medicine, dietary program, food and beauty because it has many advantages. Celery has high water content which can be easily damaged even with a little time storage. As a solution for the problem, a research to drying the celery leaf is conducted. The thin layer drying behavior of celery leaves for temperature range of 45, 50, 55, and 60 degrees C was determined in a vibrating fluidized bed dryer with dimension of 2350 mm x 300 mm. The experimental data were compared and evaluated using Henderson and Pabis, Newton, Modified Page, Logarithmic and Two Term Exponential mathematical model. The Logarithmic model satisfactorily the thin layer drying characteristic of celery with average coefficient of determination (R-2) of 0.9952, root mean square error (RMSE) of 0.02099 and sum square error (SSE) of 0.006036.