Description of atmoshperic freeze-drying process of organic apples using thermo-physical properties

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Abstract

This study discusses the influence of temperature and total moisture content on ice fraction in organic apples during atmospheric freeze-drying process.

The ice formation of glass transition events were described by Clausius- Clapeyron and Gordon Taylor equations. The obtained data is essential for design the drying process and for understanding the limiting factors.

Keywords: ice fraction, organic apples, atmospheric freeze/drying, glass transition

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Fig. 1 Example of thremal transitions in apples: raw (left) and dried (right): 1- inflection point of glass transition, 2- end of freezing (insipient point of ice melting); 3- eutectic point; 4- ice melting

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Fig. 2 Ice content increasing in apples (left), Moisture content in unfrozen solituion(right)

3.2 The state diagram for organic apples

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