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Effect of moisture sorption hysteresis on thermodynamic properties of two millet varieties 111
AVIARA, NDUBISI A.; Ojediran, John O.; Marwan, Sa'id U.; Raji, Abdulganiy O..
Application of reversible thermodynamic principles to gain fundamental understanding of food–water interactions in foods has met with limited success due to the presence of moisture sorption hysteresis which is a manifestation of irreversibility. This study was aimed at understanding the nature and extent of influence of hysteresis on thermodynamic properties of two millet varieties namely EX-BORNO and SOSAT C88. Moisture sorption data (adsorption and desorption) in the water activity and temperature ranges of 0.07 – 0.98 and 30°C – 70°C, respectively were used. Ratio of latent heat of moisture sorption to the latent heat of pure water was determined using Clausius-Clapeyron equation. Effect of moisture content on ratio of latent heat of sorption to latent...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Processing and storage Engineering EX-BORNO; SOSAT C88; Latent heat of moisture sorption; Spreading pressure; Net integral enthalpy and entropy; Isosteric heat; Differential entropy; Enthalpy-entropy compensation.
Ano: 2016 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3531
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THERMODYNAMIC PROPERTIES OF SORPTION OF RICE IN THE HUSK 70
Zeymer,Juliana S.; Corrêa,Paulo C.; Oliveira,Gabriel H. H. de; Baptestini,Fernanda M.; Faria,Igor L..
ABSTRACT This study aimed to determine the thermodynamic properties of sorption processes (desorption and adsorption) of rice in the husk, cv. Urucuia. A static-gravimetric method was used to reach equilibrium moisture content at different temperatures (10, 20, 30, 40, and 50 °C ± 1°C) and relative humidity levels (10, 30, 50, 70, and 90 % ± 2%). A decrease in moisture content led to an increment of the integral isosteric heat of sorption, indicating a higher demand for energy to remove moisture from the product. Differential entropy of sorption decreased along with a moisture content increment, with higher values for desorption. This indicates a higher mobility of water molecules during desorption if compared to adsorption. Gibbs free energy decreased...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Equilibrium moisture content; Integral isosteric heat of sorption; Differential entropy; Gibbs free energy; Enthalpy-entropy compensation theory.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162018000300369
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