Transient two-dimensional dehumidification and desorption behavior of plate desiccants under humid air flow / Hassan S. Al-Sharqawi in Industrial & engineering chemistry research, Vol. 50 N° 15 (Août 2011)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 50 N° 15 (Août 2011) . - pp. 8859-8880 Titre : Transient two-dimensional dehumidification and desorption behavior of plate desiccants under humid air flow : a conjugate model that includes diffusion and adsorption/desorption within the desiccant Type de document : texte imprimé Auteurs : Hassan S. Al-Sharqawi, Auteur Année de publication : 2011 Article en page(s) : pp. 8859-8880 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Adsorption Diffusion Modeling Air flow Desorption Dehumidification Résumé : A more rigorous conjugate-transient two-dimensional numerical model of solid bed desiccant systems (plates and narrow channels) used for gas dehumidification of a gas laminarly flowing along the desiccant, which, importantly, includes the associated transport through the desiccant body, was developed and validated. This improvement of the basic understanding of the process can be used for easier determination of ways for improving the overall performance of such systems. The solution provided a detailed exposition of the associated heat- and mass-transfer phenomena and of the desiccant performance, conducted here for both the adsorption and desorption processes in a range of air-flow Reynolds numbers and desiccant bed particle sizes and for two types of desiccant materials, silica gel and polystyrenesulfonic acid sodium salt (PSSASS) polymer. The results were also compared to those from an authors' simpler model that was published earlier and that does not consider transport through the solid desiccant. The new model was also employed to define and compute an "effective diffusion coefficient" from the basic composition of the desiccant, which is useful for characterizing desiccant properties and behavior in practical analysis. Besides the detailed behavior, some of the practical results are as follows: (i) the adsorption/desorption processes occur much faster at the flow entrance region; (ii) the mass-transport rates increase with the Reynolds number; (iii) within the studied range, manufacturing of the solid desiccant from larger particles raises its mass-transport rates; (iv) the water content and adsorption rate for PSSASS are larger than those for silica gel, thus making PSSASS a more effective desiccant than silica geL. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24395832 [article] Transient two-dimensional dehumidification and desorption behavior of plate desiccants under humid air flow : a conjugate model that includes diffusion and adsorption/desorption within the desiccant [texte imprimé] / Hassan S. Al-Sharqawi, Auteur . - 2011 . - pp. 8859-8880. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 15 (Août 2011) . - pp. 8859-8880 Mots-clés : Adsorption Diffusion Modeling Air flow Desorption Dehumidification Résumé : A more rigorous conjugate-transient two-dimensional numerical model of solid bed desiccant systems (plates and narrow channels) used for gas dehumidification of a gas laminarly flowing along the desiccant, which, importantly, includes the associated transport through the desiccant body, was developed and validated. This improvement of the basic understanding of the process can be used for easier determination of ways for improving the overall performance of such systems. The solution provided a detailed exposition of the associated heat- and mass-transfer phenomena and of the desiccant performance, conducted here for both the adsorption and desorption processes in a range of air-flow Reynolds numbers and desiccant bed particle sizes and for two types of desiccant materials, silica gel and polystyrenesulfonic acid sodium salt (PSSASS) polymer. The results were also compared to those from an authors' simpler model that was published earlier and that does not consider transport through the solid desiccant. The new model was also employed to define and compute an "effective diffusion coefficient" from the basic composition of the desiccant, which is useful for characterizing desiccant properties and behavior in practical analysis. Besides the detailed behavior, some of the practical results are as follows: (i) the adsorption/desorption processes occur much faster at the flow entrance region; (ii) the mass-transport rates increase with the Reynolds number; (iii) within the studied range, manufacturing of the solid desiccant from larger particles raises its mass-transport rates; (iv) the water content and adsorption rate for PSSASS are larger than those for silica gel, thus making PSSASS a more effective desiccant than silica geL. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24395832

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