Investigating the drying parameters of Fijou fruit in a freeze dryer

Document Type : Research Article


1 Assistant professor, Department of Mechanics of Biosystem Engineering, Sari Agricultural Sciences and Natural Resources University, Sari, Iran

2 Associate professor, Department of Mechanics of Biosystem Engineering, Sari Agricultural Sciences and Natural Resources University, Sari, Iran


Freeze drying is one of the best methods for the removal of water in temperature sensitive agricultural products. In the present study was investigated the process of drying the Fijou fruit in a freeze dryer under the influence of different pretreatments and were calculated the moisture diffusion coefficients (mass transfer coefficient) by using of Dincer and Dost models and Fick’s model, drying rate constant, convective mass transfer coefficient, specific energy consumption and specific moisture extraction ratio. Various pre-treatments applied to the samples are ascorbic acid (with 1% concentration and 1, 2 and 3 min), microwave (with 90 W for 10 min, 180 W for 5 min and 360 W for 2.5 min), blanching with hot water and steam (with 1, 2 and 3 min), potassium carbonate (with 2.5% concentration and 1, 2 and 3 min), osmotic (with 45% sucrose concentration and 10, 20 and 30 min), and ultrasound (with 10, 20 and 30 min). The highest drying rate constant and convective mass coefficient were obtained in microwave pre-treatment to 0.0073 (s-1) and 2.900×10-5 (m2/s), respectively. The range of moisture diffusion coefficients was variable in Fick’s model from 0.7404×10-8 to 1.3996×10-8 (m2/s) and for Dincer and Dost model from 4.5318×10-7 to 9.2149×10-7 (m2/s). The highest and lowest specific energy requirements were 47.23 and 23.61 kWh/kg in osmotic and microwave pre-treatment, respectively. Also the highest and lowest specific moisture extraction ratio were 0.0423 and 0.0212 kg/kWh in microwave and osmotic pre-treatment, respectively.

Graphical Abstract

Investigating the drying parameters of Fijou fruit in a freeze dryer


  • In the present study the Fijou fruit was dried in a freeze dryer under seven different pretreatments.
  • The highest drying rate constant was obtained in microwave pre-treatment to 0.0073 s-1.
  • The highest convective mass coefficient was obtained in microwave pre-treatment to 2.900×10-5 m2/s.
  • The highest specific energy consumption was obtained in osmotic pre-treatment 47.23 kg/kWh.
  • Among different pretreatments, the use of microwave had the best result in terms of mass transfer and energy consumption.


Main Subjects

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Volume 5, Issue 4
November 2018
Pages 699-713
  • Receive Date: 16 April 2018
  • Revise Date: 17 June 2018
  • Accept Date: 24 June 2018
  • First Publish Date: 23 July 2018