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- Title
Thermodynamic properties of water desorption in Buchenavia capitata (Vahl) Eichler.
- Authors
da Silva, Hellismar W.; de Oliveira, Daniel E. C.; Resende, Osvaldo; Costa, Lílian M.
- Abstract
Thermodynamic properties provide information on energy demand and kinetic parameters in water sorption processes in agricultural products. Such information is essential to analyze and scale drying and storage equipment. The objective of this study was to determine the thermodynamic properties involved in the water desorption process in Buchenavia capitata (Vahl) Eichler seeds with moisture contents ranging from 13.31 to 7.21% dry basis (d.b.), obtained by the indirect static method, at temperatures of 10, 20, 30 and 40 °C. The latent heat of vaporization, differential entropy and Gibbs free energy increase with the reduction of the moisture content of the seeds. The enthalpy-entropy compensation theory is valid for the desorption process, which is controlled by the enthalpy. The desorption of water in the seeds is not a spontaneous process.
- Subjects
THERMODYNAMICS; PRODUCE trade; VAPORIZATION; MOISTURE content of seeds; ENTHALPY
- Publication
Revista Brasileira de Engenharia Agricola e Ambiental - Agriambi, 2018, Vol 22, Issue 12, p878
- ISSN
1807-1929
- Publication type
Article
- DOI
10.1590/1807-1929/agriambi.v22n12p878-883