Mathematical Modeling and Investigation of the Effect of Power on Effective Moisture Diffusivity and Activation Energy of Turnip Slices in Microwave Drying

Document Type : Original Research

Authors

1 Department of Mechanical Engineering of Biosystems, Faculty of Agriculture Shahid Bahonar University of Kerman, Kerman, Iran.

2 Department of Mechanical Engineering of Biosystems, Faculty of Agriculture, Shahid Bahonar University of Kerman, Kerman, Iran

Abstract

Microwave (MW) drying is an energy-efficient drying method that helps maintain product longevity and quality. Microwave drying process factors are among the important issues in innovative methods of drying food and agricultural products. In this study, the effect of microwave power on moisture content, moisture ratio, drying rate, Effective Moisture Diffusivity and activation energy was investigated in the microwave drying process. For this purpose, 3 mm thick turnip slice samples were dried at different microwave power levels (550, 770 and 1100 W). To determine the kinetic parameters and mathematically model the drying process, experimental data were fitted to various models. Among the thin layer drying models, the Midili model showed a better fit for all drying conditions at different power levels. As the microwave output power increased, the Deff values increased from 3.829×10-9 to 8.845×10-9 m2/s. During the drying process, higher moisture release rates occur at lower activation energy levels. The values of Ea and D0 were determined as 20.869 W/g and 2.0×10-8 m2/s, respectively.

Keywords

References

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History

  • Receive Date: 22 February 2025
  • Revise Date: 01 June 2025
  • Accept Date: 07 June 2025

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