Hydrodynamics of gas–liquid cocurrent flows in micropacked beds—wall visualization study / Ali Faridkhou in Industrial & engineering chemistry research, Vol. 51 N° 50 (Décembre 2012)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 51 N° 50 (Décembre 2012) . - pp. 16495–16504 Titre : Hydrodynamics of gas–liquid cocurrent flows in micropacked beds—wall visualization study Type de document : texte imprimé Auteurs : Ali Faridkhou, Auteur ; Faïçal Larachi, Auteur Année de publication : 2013 Article en page(s) : pp. 16495–16504 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Hydrodynamics Gas Liquid Résumé : An inverted microscopy technique was implemented to scrutinize the wall-region hydrodynamics of gas–liquid cocurrent flows in micropacked beds. Digital image analysis enabled characterization of two contiguous flow regimes, hysteresis, and transition thereof. Low- and high-interaction regimes featuring, respectively, slow and rapid displacements of gas–liquid boundary were identified. The onset of regime changeover was delineated by distinguishing the fluctuating behavior in time of characteristic lengths extracted from the areas occupied by gas and liquid in the field of view. A Charpentier and Favier flow regime map demarcating low and high interaction regimes in conventional macroscale trickle beds was elaborated for the sake of comparison of micropacked bed transitions for three different gas–liquid systems (air–water, argon–water, and argon–sucrose solution). The flow regime map suggests that micropacked bed transition occurs at considerably lower L/G values. Manifestation of hysteresis in micropacked beds was apprehended via pressure drop measurements and wetting fraction determination both in imbibition and drainage modes. In agreement with macroscale packed bed observations, the drainage branch revealed a larger pressure drop and wetting fraction compared with the imbibition branch for the same set of bed and fluid flow rates. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301709x [article] Hydrodynamics of gas–liquid cocurrent flows in micropacked beds—wall visualization study [texte imprimé] / Ali Faridkhou, Auteur ; Faïçal Larachi, Auteur . - 2013 . - pp. 16495–16504. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 50 (Décembre 2012) . - pp. 16495–16504 Mots-clés : Hydrodynamics Gas Liquid Résumé : An inverted microscopy technique was implemented to scrutinize the wall-region hydrodynamics of gas–liquid cocurrent flows in micropacked beds. Digital image analysis enabled characterization of two contiguous flow regimes, hysteresis, and transition thereof. Low- and high-interaction regimes featuring, respectively, slow and rapid displacements of gas–liquid boundary were identified. The onset of regime changeover was delineated by distinguishing the fluctuating behavior in time of characteristic lengths extracted from the areas occupied by gas and liquid in the field of view. A Charpentier and Favier flow regime map demarcating low and high interaction regimes in conventional macroscale trickle beds was elaborated for the sake of comparison of micropacked bed transitions for three different gas–liquid systems (air–water, argon–water, and argon–sucrose solution). The flow regime map suggests that micropacked bed transition occurs at considerably lower L/G values. Manifestation of hysteresis in micropacked beds was apprehended via pressure drop measurements and wetting fraction determination both in imbibition and drainage modes. In agreement with macroscale packed bed observations, the drainage branch revealed a larger pressure drop and wetting fraction compared with the imbibition branch for the same set of bed and fluid flow rates. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301709x

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