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Assessment of stability of spouted bed using pressure fluctuation analysis / Palash Kumar Mollick in Industrial & engineering chemistry research, Vol. 51 N° 37 (Septembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 37 (Septembre 2012) . - pp. 12117–12125 Titre : Assessment of stability of spouted bed using pressure fluctuation analysis Type de document : texte imprimé Auteurs : Palash Kumar Mollick, Auteur ; Dakshinamoorthy Sathiyamoorthy, Auteur Année de publication : 2012 Article en page(s) : pp. 12117–12125 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Analysis  pressure  fluctuation Résumé : Spouted beds are widely used in many industrial applications for achieving good gas–solid contact/mixing especially for a bed of coarse/nonspherical particles. The stability of the spouted bed is important and critical for certain sensitive applications like coating, blending, catalytic conversion, etc. This paper presents the results of experimental investigations carried out using both two-dimensional and three-dimensional spouted beds to identify various transition velocities and condition to arrive at a stable spouted bed. Standard deviation and power spectral density (PSD) of pressure fluctuation were used to determine the stable operating fluidization/spouting velocity. Zirconia microspheres were used as the spouted bed material and argon, nitrogen, and methane were used as spouting gases. Standard deviation of pressure fluctuation was calculated at minimum spouting velocity and at a velocity corresponding to transition from stable spouting to unstable spouting condition. It is shown that standard deviation of pressure fluctuation and PSD varies with various spouting gases and seen to follow a trend with Archemedes number of a given gas–solid system. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie300950p [article] Assessment of stability of spouted bed using pressure fluctuation analysis [texte imprimé] / Palash Kumar Mollick, Auteur ; Dakshinamoorthy Sathiyamoorthy, Auteur . - 2012 . - pp. 12117–12125. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 37 (Septembre 2012) . - pp. 12117–12125 Mots-clés : Analysis  pressure  fluctuation Résumé : Spouted beds are widely used in many industrial applications for achieving good gas–solid contact/mixing especially for a bed of coarse/nonspherical particles. The stability of the spouted bed is important and critical for certain sensitive applications like coating, blending, catalytic conversion, etc. This paper presents the results of experimental investigations carried out using both two-dimensional and three-dimensional spouted beds to identify various transition velocities and condition to arrive at a stable spouted bed. Standard deviation and power spectral density (PSD) of pressure fluctuation were used to determine the stable operating fluidization/spouting velocity. Zirconia microspheres were used as the spouted bed material and argon, nitrogen, and methane were used as spouting gases. Standard deviation of pressure fluctuation was calculated at minimum spouting velocity and at a velocity corresponding to transition from stable spouting to unstable spouting condition. It is shown that standard deviation of pressure fluctuation and PSD varies with various spouting gases and seen to follow a trend with Archemedes number of a given gas–solid system. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie300950p

Modeling of chemical vapor deposition of pyrolytic carbon in a gas - spouted bed reactor / Palash Kumar Mollick in Industrial & engineering chemistry research, Vol. 50 N° 23 (Décembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 23 (Décembre 2011) . - pp. 13313–13321 Titre : Modeling of chemical vapor deposition of pyrolytic carbon in a gas - spouted bed reactor Type de document : texte imprimé Auteurs : Palash Kumar Mollick, Auteur ; Dakshinamoorthy Sathiyamoorthy, Auteur ; Pandugula Thirmaleshwar Rao, Auteur Année de publication : 2012 Article en page(s) : pp. 13313–13321 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Reactor  Fluidization  Spouted  bed  Chemical  vapor  deposition  Modeling Résumé : Spouted beds are used in chemical vapor deposition as they provide good solid mixing, thereby enhancing high mass and heat transfer rates. In the present study, investigations on the kinetics of a coating process by chemical vapor deposition were carried out in a spouted-bed reactor. Pyrolytic carbon coatings were studied by thermal cracking of acetylene mixed with carrier gas argon at 1350 °C. A theoretical model was proposed based on the mass balance of the precursor in the spout and annulus zones at isothermal condition, and the model equations were solved using MATLAB (version 7.1) software. The effect of the operating gas velocity, initial static bed height, and acetylene concentration on the coating rate was examined experimentally and also by simulation results. The simulated results agreed well with the experimental results. Model equations used for simulation were utilized to evaluate the reaction rate constant and radial gas diffusion coefficient and then to study the effect of spout diameter, operating gas velocity, and precursor concentration on the overall conversion of the precursor. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25267488 [article] Modeling of chemical vapor deposition of pyrolytic carbon in a gas - spouted bed reactor [texte imprimé] / Palash Kumar Mollick, Auteur ; Dakshinamoorthy Sathiyamoorthy, Auteur ; Pandugula Thirmaleshwar Rao, Auteur . - 2012 . - pp. 13313–13321. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 23 (Décembre 2011) . - pp. 13313–13321 Mots-clés : Reactor  Fluidization  Spouted  bed  Chemical  vapor  deposition  Modeling Résumé : Spouted beds are used in chemical vapor deposition as they provide good solid mixing, thereby enhancing high mass and heat transfer rates. In the present study, investigations on the kinetics of a coating process by chemical vapor deposition were carried out in a spouted-bed reactor. Pyrolytic carbon coatings were studied by thermal cracking of acetylene mixed with carrier gas argon at 1350 °C. A theoretical model was proposed based on the mass balance of the precursor in the spout and annulus zones at isothermal condition, and the model equations were solved using MATLAB (version 7.1) software. The effect of the operating gas velocity, initial static bed height, and acetylene concentration on the coating rate was examined experimentally and also by simulation results. The simulated results agreed well with the experimental results. Model equations used for simulation were utilized to evaluate the reaction rate constant and radial gas diffusion coefficient and then to study the effect of spout diameter, operating gas velocity, and precursor concentration on the overall conversion of the precursor. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25267488