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Kinetics of potato drying using fluidized bed dryer.

Sushant Balasaheb Bakal¹, Gyanendra Prasad Sharma, Somnath P Sonawane

¹Department of Processing and Food Engineering, CTAE, Maharana Pratap University of Agriculture and Technology, Udaipur, 313001 India.

Journal of Food Science and Technology

|October 2, 2013

Summary

Potato drying kinetics were studied in a fluidized bed dryer, examining temperature and shape effects. The Page model accurately described moisture transfer, with temperature significantly impacting drying rates.

Keywords:

Activation energy Aspect ratio Cuboidal and cylindrical shape Diffusivity Fluidised bed drying Potato

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Area of Science:

Food Science
Chemical Engineering
Materials Science

Background:

Fluidized bed drying is an efficient method for processing agricultural products like potatoes.
Understanding drying kinetics is crucial for optimizing process parameters and product quality.

Purpose of the Study:

To investigate the impact of air temperature and potato shape on drying kinetics.
To analyze moisture transfer using Fick's diffusion model and evaluate mathematical models for drying data.
To determine the activation energy for moisture diffusion.

Main Methods:

Potato samples (cuboidal and cylindrical shapes with varying aspect ratios) were dried in a fluidized bed dryer.
Drying experiments were conducted at air temperatures of 50, 60, and 70°C with an air velocity of 7 m/s.
Effective diffusivity was calculated, and the Page and simple exponential models were fitted to the experimental data.

Main Results:

Drying kinetics were significantly influenced by air temperature and potato geometry.
The Page model provided a better fit to the experimental drying data compared to the simple exponential model.
Arrhenius activation energy was determined, quantifying the temperature dependence of moisture diffusivity.

Conclusions:

Fluidized bed drying parameters, including temperature and sample shape, are critical for efficient potato drying.
The Page model is suitable for describing potato drying in a fluidized bed.
Temperature plays a key role in accelerating moisture diffusion during the drying process.