Mathematical modelling of thin layer drying kinetics of plum in a tunnel dryer

Drying kinetics of plum (control, blanching and blanching in 1% KMS solution as pretreatments) in a tunnel dryer was studied at 55, 60 and 65 °C air temperatures. Drying of plum slices occurred in falling rate period. It was found that treated plum slices dried faster. Six thin layer drying models were fitted to the experimental moisture ratio data. Among the mathematical models investigated, the logarithmic model satisfactorily described the drying behaviour of plum slices with high r2 values. The effective moisture diffusivity (Deff) of plum increased as the drying air temperature increased. The Deff values were higher for treated samples than the control.