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Title: Moisture diffusivity estimation in carrots
Authors: Τσίτσου, Αφροδίτη
Committee Members: [χ.ό.]
Item type: Postgraduate thesis
Keywords: Food--Moisture;εκτίμηση διάχυσης υγρασίας
Subjects: Food technology and engineering
Τεχνολογία τροφίμων
Issue Date: 11-Jan-2015
Publishing institution: Τεχνολογικό Εκπαιδευτικό Ίδρυμα Αθήνας. Σχολή Τεχνολογίας Τροφίμων & Διατροφής. Τμήμα Τεχνολογίας Τροφίμων
Abstract: In this work the estimation of moisture diffusivity in carrot is attempted. In the theoretical part, moisture diffusivity is defined and the available methods of evaluating moisture diffusivity are briefly described . 20 drying experiments at different conditions are realised. The simplified method of slopes is used in order to estimate moisture diffusivity in carrot. During the experiments, constant-rate period was supressed and the succession of two falling-rate periods was observed. A Fickian diffusion coefficient for each falling-rate period is estimated. Moisture diffusivity calculated for carrots in this work, is in the range 1.7836 10-9 - 3.7408 10-8m2/sec for the first falling-rate period and in the range 6.6637 10-10 -1.572610·8 2/sec for the second falling-rate period. The experimental result are represented by an Arrhenius type of relationship. The energy of activation for water diffusion is calculated equal to 921.7 KJ/Kg. The effect of external factors [Tφ (°C), % R.H., u(m/sec)] on moisture diffusivity as well as the succession of drying periods are examined. The assumptions of the model used and the limitations of the simplified method are also discussed.
Language: English
Citation: Tsitsou, A. (1994) Moisture diffusivity estimation in carrots. Master thesis. University of Humberside
Access scheme: Embargo
License: An error occurred on the license name.
Appears in Collections:Εργασίες Φοιτητών

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