A Method for Determination of Porosity Change from Shrinkage Curves of Deformable Materials

Among the numerous models developed to predict the shrinkage of materials during drying, the model developed by Katekawa and Silva [1] gives a general relationship between shrinkage and porosity with a limited number of parameters such as initial density of the wet product, true density of the solid...

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Bibliographic Details
Published in:Drying technology 2007-01, Vol.25 (4), p.621-628
Main Authors: Madiouli, J., Lecomte, D., Nganya, T., Chavez, S., Sghaier, J., Sammouda, H.
Format: Article
Language:English
Subjects:
Banana
Carrot
Chemical and Process Engineering
Drying
Engineering Sciences
Materials
Modeling
Porosity
Shrinkage
Sludge
Xerogel
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Summary:Among the numerous models developed to predict the shrinkage of materials during drying, the model developed by Katekawa and Silva [1] gives a general relationship between shrinkage and porosity with a limited number of parameters such as initial density of the wet product, true density of the solid phase, and true density of the liquid phase. A graphical interpretation of this model is proposed to visualize the changes of porosity by comparing the experimental shrinkage curve with an ideal one. Four examples are given to illustrate the applicability of the model using different materials (carrot, banana, xerogel, and sludge), two types of the solvent (water, isopropanol), and two drying technologies (convective drying, freeze drying). Porosity calculations were found to be very consistent and complementary with porosity measurements.
ISSN:0737-3937
1532-2300
DOI:10.1080/07373930701227185