| Autor: |
Saad, Amel, Touati, Boumediene, Draoui, Belkacem, Tabti, Boufeldja, Abdenebi, Asma, Benaceur, Said |
| Předmět: |
|
| Zdroj: |
Modelling & Simulation in Engineering; 2014, p1-8, 8p |
| Abstrakt: |
Desorption and adsorption equilibrium moisture isotherms of Ziziphus spina-christi leaves were determined using the gravimetricstaticmethod at 30, 40, and 50°C forwater activity (aw) ranging from0.057 to 0.898.At a given aw, the results show that the moisture content decreases with increasing temperature. A hysteresis effect was observed. The experimental data of sorption were fitted by eight models (GAB, BET, Henderson-Thompson, modified-Chung Pfost, Halsey, Oswin, Peleg, and Adam and Shove). After evaluating the models according to several criteria, the Peleg and Oswin models were found to be the most suitable for describing the sorption curves. Thenet isosteric heats of desorption and adsorption of Ziziphus spina-christi leaves were calculated by applying the Clausius-Clapeyron equation to the sorption isotherms and an expression for predicting these thermodynamic properties was given. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
