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Bubble evolution through a submerged orifice using smoothed particle hydrodynamics / Arup K. Das in Industrial & engineering chemistry research, Vol. 48 N° 18 (Septembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 18 (Septembre 2009) . - pp. 8726–8735 Titre : Bubble evolution through a submerged orifice using smoothed particle hydrodynamics : effect of different thermophysical properties Type de document : texte imprimé Auteurs : Arup K. Das, Auteur ; Prasanta K. Das, Auteur Année de publication : 2010 Article en page(s) : pp. 8726–8735 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Gas  bubbles  Submerged  orifice  Liquid  pool  Industrial  applications Résumé : Formation of gas bubbles through an orifice under a liquid pool is important as a topic of fundamental research and is relevant in diverse industrial applications. This complex process is influenced by a large number of process parameters including the properties of the liquid and the gas phase. In the present work investigations have been made for bubble evolution at a submerged orifice using a computational simulation. Smoothed particle hydrodynamics is used to model the formation and detachment of the bubble from the orifice mouth. Using the advantage of this particle-based method, effects of density, viscosity, and surface tension of the liquid are investigated by noticing instantaneous bubble contour and the duration of bubble growth. The present simulation has been validated satisfactorily against published results. Finally, the process of neck formation and bubble pinch off has also been studied by varying the specific fluid properties individually. It has been noticed that the effect of surface tension and the effect of viscosity on bubble growth and necking are just the reverse of the effect of density on these processes. Moreover, compared to surface tension and density, the effect of viscosity on bubble evolution is marginal. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900350h#cor1 [article] Bubble evolution through a submerged orifice using smoothed particle hydrodynamics : effect of different thermophysical properties [texte imprimé] / Arup K. Das, Auteur ; Prasanta K. Das, Auteur . - 2010 . - pp. 8726–8735. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 18 (Septembre 2009) . - pp. 8726–8735 Mots-clés : Gas  bubbles  Submerged  orifice  Liquid  pool  Industrial  applications Résumé : Formation of gas bubbles through an orifice under a liquid pool is important as a topic of fundamental research and is relevant in diverse industrial applications. This complex process is influenced by a large number of process parameters including the properties of the liquid and the gas phase. In the present work investigations have been made for bubble evolution at a submerged orifice using a computational simulation. Smoothed particle hydrodynamics is used to model the formation and detachment of the bubble from the orifice mouth. Using the advantage of this particle-based method, effects of density, viscosity, and surface tension of the liquid are investigated by noticing instantaneous bubble contour and the duration of bubble growth. The present simulation has been validated satisfactorily against published results. Finally, the process of neck formation and bubble pinch off has also been studied by varying the specific fluid properties individually. It has been noticed that the effect of surface tension and the effect of viscosity on bubble growth and necking are just the reverse of the effect of density on these processes. Moreover, compared to surface tension and density, the effect of viscosity on bubble evolution is marginal. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900350h#cor1

Motion of Taylor bubbles and taylor drops in liquid-liquid systems / Tapas K. Mandal in Industrial & engineering chemistry research, Vol. 47 N°18 (Septembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N°18 (Septembre 2008) . - p. 7048–7057 Titre : Motion of Taylor bubbles and taylor drops in liquid-liquid systems Type de document : texte imprimé Auteurs : Tapas K. Mandal, Auteur ; Gargi Das, Auteur ; Prasanta K. Das, Auteur Année de publication : 2008 Article en page(s) : p. 7048–7057 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Liquid  Taylor  bubbles  Liquid  Taylor  drops  Inclined  tubes  Vertical  tubes  Liquid-liquid  systems Résumé : The present work reports an experimental study on the shape and stability of liquid Taylor bubbles and liquid Taylor drops in vertical and inclined tubes. Experiments have been performed with five liquid pairs, namely, water−kerosene, brine−kerosene, water−benzene, water−cyclohexane, and water−2-heptanone, in five different tube diameters ranging from 0.012 to 0.046 m and inclinations of 0°, 15°, 30°, 45°, 60°, and 75° with vertical. The effect of tube inclination, tube diameter, and pipe material on shape, stability, and velocity of a liquid Taylor bubbles and liquid Taylor drops has been explained qualitatively from basic physics. The existing correlations generally used for gas−liquid system have been modified to predict the rise velocity in vertical tubes. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8004429 [article] Motion of Taylor bubbles and taylor drops in liquid-liquid systems [texte imprimé] / Tapas K. Mandal, Auteur ; Gargi Das, Auteur ; Prasanta K. Das, Auteur . - 2008 . - p. 7048–7057. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N°18 (Septembre 2008) . - p. 7048–7057 Mots-clés : Liquid  Taylor  bubbles  Liquid  Taylor  drops  Inclined  tubes  Vertical  tubes  Liquid-liquid  systems Résumé : The present work reports an experimental study on the shape and stability of liquid Taylor bubbles and liquid Taylor drops in vertical and inclined tubes. Experiments have been performed with five liquid pairs, namely, water−kerosene, brine−kerosene, water−benzene, water−cyclohexane, and water−2-heptanone, in five different tube diameters ranging from 0.012 to 0.046 m and inclinations of 0°, 15°, 30°, 45°, 60°, and 75° with vertical. The effect of tube inclination, tube diameter, and pipe material on shape, stability, and velocity of a liquid Taylor bubbles and liquid Taylor drops has been explained qualitatively from basic physics. The existing correlations generally used for gas−liquid system have been modified to predict the rise velocity in vertical tubes. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8004429