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Modeling of Moisture Distribution in Thin Layer Drying Process

Year: 1385
COI: NICEC11_063
Language: EnglishView: 1,575
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Daghbandan - Faculty of Engineering, University of Guilan
Ghandad Zadeh - Faculty of Engineering, University of Guilan
Ahrimankosh - Faculty of Engineering, University of Guilan
Mohammadi - Faculty of Engineering, University of Guilan


Apple slices were dried with hot air and combined microwave hot air drying methods in an microwave dryer, the apple slices were prepared as single layer with thickness of 5, external and internal diameter 60 and 20 mm respectively. The effect of drying air temperature and microwave power on the drying characteristics were determined. It was found that apple slices would dry perfectly within 30-54 min under convective conditions and 27-48 min under microwave-convective conditions. The transport of water during dehydration was described by applying the Fick s diffusion model and the effective diffusivity changed between 2.39*10-9 and 4.14*10 -9 m2/s in convective method. A non-linear regression procedure was used to fit 5 thin layer drying models available in the literature to the experimental drying curves. The models were compared using the coefficient of determination, mean relative percent error, root mean square error and SSE. The 3rd Degree polynomial model has shown a better fit to the experimental drying data as compared to other models. Finally, this paper presents a developed mathematical model for predicting transport phenomena in drying process of apple slices.


Apple - Microwave drying- Modelling - Moisture ratio - Effective diffusivity

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Daghbandan, and Ghandad Zadeh, and Ahrimankosh, and Mohammadi, ,1385,Modeling of Moisture Distribution in Thin Layer Drying Process,11th National Iranian Chemical Engineering Congress,Tehran,

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  • _ Yaldiz, O, and Ertekin.C, " Thin layer solar of ...
  • Park.K.J, Vohnikova, and Brod.F.P.R, Evaluation of drying parameters and desorption ...
  • Kaymak- Ertekin. F _ "Drying of rehydrating kinetics of green ...
  • Doymaz. I., and Pala.M _ Hot-air drying _ haracteristics of ...
  • Dem ir.V, Gunhan .T, Yagciog lu.A. K and Deg i ...
  • Se nadeera.W. _ Bhandari. B.R., Young.G and Wijesinghe.B _ Influence ...

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