Poster (Scientific congresses and symposiums)
ISOTHERMS AND ISOSTERIC HEAT OF DESORPTION OF WATERMELON FRUIT
Khama, Réda; Aissini, F.; Alkama, R. et al.
2017EuroDrying’2017 – 6th European Drying Conference
 

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Keywords :
watermelon; desorption isotherms; isosteric heat; dynamic vapor sorption
Abstract :
[en] In this paper, a new unpublished study on the watermelon fruit is presented. It concerns the experimental determination of the water desorption isotherms at three different temperatures, using the dynamic method requiring the Dynamic Vapor System device (DVS). In order to select the appropriate desorption curve equation, 11 different models available in the literature were applied to the experimental data. The models were compared using the correlation coefficient, the standard error, the reduced chi-squared, the mean bias error and the root mean square error; they were predicted by a non-linear regression analysis using the Curve Expert software. The effect of the temperature on the constants of the found equation is also examined. Finally, the desorption isosteric heat of watermelon is determined using the Clausius-Clapeyron relation. Contrary to long times taken in the static method, the results show that 4.5 days are widely sufficient to reach the equilibrium via the DVS device. In addition, the obtained curves are of the type III and the Henderson model is the most appropriate model representing them. In the interval 0.05 - 0.45 kg of water/kg d.m of equilibrium moisture, the values of the isosteric heat vary from 65.02 to 113.25 kJ/mol. Finally, the equation giving the isosteric heat of desorption v.s. the equilibrium moisture content is obtained.
Disciplines :
Chemical engineering
Author, co-author :
Khama, Réda;  Université Kasdi Merbah Ouargla, Algérie > Département de Génie Mécanique
Aissini, F.;  Université de Bejaia, Algeria > Faculté de Technologie > Laboratoire de Génie de l’Environnement
Alkama, R.;  Université de Bejaia, Algeria > Faculté de Technologie > Laboratoire de Génie Électrique
Fraikin, Laurent ;  Université de Liège - ULiège > Department of Chemical Engineering > PEPs (Product, Environment, Processes)
Léonard, Angélique  ;  Université de Liège - ULiège > Department of Chemical Engineering > PEPs (Product, Environment, Processes)
Language :
English
Title :
ISOTHERMS AND ISOSTERIC HEAT OF DESORPTION OF WATERMELON FRUIT
Publication date :
21 June 2017
Event name :
EuroDrying’2017 – 6th European Drying Conference
Event organizer :
Département de Chemical Engineering, Université de Liège
Event place :
Liège, Belgium
Event date :
19-21 June 2017
Audience :
International
Available on ORBi :
since 05 August 2019

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