Modelling high temperature, thin layer, drying kinetics of olive bagasse

Freire, F.; Figueiredo, A.; Ferrao, P.

Modelling high temperature, thin layer, drying kinetics of olive bagasse

2001

Freire, F. | Figueiredo, A. | Ferrao, P.

The thin layer drying kinetics of olive bagasse at relatively high temperatures is characterized. The influences of product granularity, gas velocity and temperature on the kinetics have been experimentally analysed. A laboratory dryer and its data acquisition system were designed and constructed to enable a wide range of operating velocities and temperatures. The drying conditions, investigated in this study, included combustion products of air and propane with dry-bulb temperatures ranging from 125 to 250 degrees C, relative humidity lower than 1% and gas velocities ranging from 0.5 to 2.0 m s-1. The results of the drying kinetics experiments were fitted to a model based on Fick's law, which allowed for the determination of the effective moisture diffusivity as a function of temperature. Accurate agreement between experimental results and predicted curves was found for gas velocities above a critical velocity, quantified as 1.5 m s-1.

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