Mathematical Modeling of Moisture Sorption Isotherms and Determination of Isosteric Heats of Sorption of Ziziphus Leaves
Desorption and adsorption equilibrium moisture isotherms of Ziziphus spina-christi leaves were determined using the gravimetric-static method at 30, 40, and 50°C for water activity (aw) ranging from 0.057 to 0.898. At a given aw, the results show that the moisture content decreases with increasing t...
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| Format: | Article |
| Language: | English |
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Wiley
2014-01-01
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| Series: | Modelling and Simulation in Engineering |
| Online Access: | http://dx.doi.org/10.1155/2014/427842 |
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| author | Amel Saad Boumediene Touati Belkacem Draoui Boufeldja Tabti Asma Abdenebi Said Benaceur |
| author_facet | Amel Saad Boumediene Touati Belkacem Draoui Boufeldja Tabti Asma Abdenebi Said Benaceur |
| author_sort | Amel Saad |
| collection | DOAJ |
| description | Desorption and adsorption equilibrium moisture isotherms of Ziziphus spina-christi leaves were determined using the gravimetric-static method at 30, 40, and 50°C for water activity (aw) ranging from 0.057 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. The net 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. |
| format | Article |
| id | doaj-art-328cd57b282e4f2aace282ad2f3069af |
| institution | Kabale University |
| issn | 1687-5591 1687-5605 |
| language | English |
| publishDate | 2014-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Modelling and Simulation in Engineering |
| spelling | doaj-art-328cd57b282e4f2aace282ad2f3069af2025-02-03T06:07:45ZengWileyModelling and Simulation in Engineering1687-55911687-56052014-01-01201410.1155/2014/427842427842Mathematical Modeling of Moisture Sorption Isotherms and Determination of Isosteric Heats of Sorption of Ziziphus LeavesAmel Saad0Boumediene Touati1Belkacem Draoui2Boufeldja Tabti3Asma Abdenebi4Said Benaceur5Laboratoire d’ Energétiques en Zones Arides (ENERGARID), Equipe Gisement Solaire et ses Applications (GSA), Université de Bechar, 08000 Bechar, AlgeriaLaboratoire d’ Energétiques en Zones Arides (ENERGARID), Equipe Gisement Solaire et ses Applications (GSA), Université de Bechar, 08000 Bechar, AlgeriaLaboratoire d’ Energétiques en Zones Arides (ENERGARID), Equipe Gisement Solaire et ses Applications (GSA), Université de Bechar, 08000 Bechar, AlgeriaLaboratoire de Chimie Organique, Substances Naturelles et Analyses, Département de Chimie, Faculté des Sciences, Université Abou Bekr Belkaid, 13000 Tlemcen, AlgeriaLaboratoire d’ Energétiques en Zones Arides (ENERGARID), Equipe Gisement Solaire et ses Applications (GSA), Université de Bechar, 08000 Bechar, AlgeriaLaboratoire d’ Energétiques en Zones Arides (ENERGARID), Equipe Gisement Solaire et ses Applications (GSA), Université de Bechar, 08000 Bechar, AlgeriaDesorption and adsorption equilibrium moisture isotherms of Ziziphus spina-christi leaves were determined using the gravimetric-static method at 30, 40, and 50°C for water activity (aw) ranging from 0.057 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. The net 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.http://dx.doi.org/10.1155/2014/427842 |
| spellingShingle | Amel Saad Boumediene Touati Belkacem Draoui Boufeldja Tabti Asma Abdenebi Said Benaceur Mathematical Modeling of Moisture Sorption Isotherms and Determination of Isosteric Heats of Sorption of Ziziphus Leaves Modelling and Simulation in Engineering |
| title | Mathematical Modeling of Moisture Sorption Isotherms and Determination of Isosteric Heats of Sorption of Ziziphus Leaves |
| title_full | Mathematical Modeling of Moisture Sorption Isotherms and Determination of Isosteric Heats of Sorption of Ziziphus Leaves |
| title_fullStr | Mathematical Modeling of Moisture Sorption Isotherms and Determination of Isosteric Heats of Sorption of Ziziphus Leaves |
| title_full_unstemmed | Mathematical Modeling of Moisture Sorption Isotherms and Determination of Isosteric Heats of Sorption of Ziziphus Leaves |
| title_short | Mathematical Modeling of Moisture Sorption Isotherms and Determination of Isosteric Heats of Sorption of Ziziphus Leaves |
| title_sort | mathematical modeling of moisture sorption isotherms and determination of isosteric heats of sorption of ziziphus leaves |
| url | http://dx.doi.org/10.1155/2014/427842 |
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