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Simulation of moisture uptake and transport in a bed of urea particles / Xiao-Dong Nie in Industrial & engineering chemistry research, Vol. 47 N°20 (Octobre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N°20 (Octobre 2008) . - P. 7888-7896 Titre : Simulation of moisture uptake and transport in a bed of urea particles Type de document : texte imprimé Auteurs : Xiao-Dong Nie, Auteur ; Richard W. Evitts, Auteur ; Robert W. Besant, Auteur Année de publication : 2008 Article en page(s) : P. 7888-7896 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Granular  urea  Moisture Résumé : Granular urea is a commonly used fertilizer, and it is subject to caking when exposed to small quantities of moisture. In this paper, coupled heat and moisture transport equations are used to predict one-dimensional temperature and moisture content distributions in a bed of bulk granular urea particles when humid air flows uniformly through the bed. The moisture sorption and transport processes consider two computational domains—water vapor diffusion inside each particle and water vapor convection and diffusion in the interstitial air space in the urea particle bed. For energy transport, the temperature is assumed to be uniform inside each particle, but convective heat transfer and conduction between the urea particles and the interstitial air outside particles occur throughout the bed. Comparisons between simulations and data show agreement within the experimental uncertainties for low Reynolds number conditions, where both internal particle and external bed sorption processes are important for porous urea particles in bulk storage. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie701744g [article] Simulation of moisture uptake and transport in a bed of urea particles [texte imprimé] / Xiao-Dong Nie, Auteur ; Richard W. Evitts, Auteur ; Robert W. Besant, Auteur . - 2008 . - P. 7888-7896. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N°20 (Octobre 2008) . - P. 7888-7896 Mots-clés : Granular  urea  Moisture Résumé : Granular urea is a commonly used fertilizer, and it is subject to caking when exposed to small quantities of moisture. In this paper, coupled heat and moisture transport equations are used to predict one-dimensional temperature and moisture content distributions in a bed of bulk granular urea particles when humid air flows uniformly through the bed. The moisture sorption and transport processes consider two computational domains—water vapor diffusion inside each particle and water vapor convection and diffusion in the interstitial air space in the urea particle bed. For energy transport, the temperature is assumed to be uniform inside each particle, but convective heat transfer and conduction between the urea particles and the interstitial air outside particles occur throughout the bed. Comparisons between simulations and data show agreement within the experimental uncertainties for low Reynolds number conditions, where both internal particle and external bed sorption processes are important for porous urea particles in bulk storage. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie701744g