Documents disponibles écrits par cet auteur

Dynamic simulation of Ledinegg instability / L.C. Ruspini in Journal of natural gas science and engineering, Vol. 2 N° 5 (Novembre 2010) 

Public ISBD [article]  in Journal of natural gas science and engineering > Vol. 2 N° 5 (Novembre 2010) . - pp. 211–216 Titre : Dynamic simulation of Ledinegg instability Type de document : texte imprimé Auteurs : L.C. Ruspini, Auteur ; C. A. Dorao, Auteur ; M. Fernandino, Auteur Année de publication : 2012 Article en page(s) : pp. 211–216 Note générale : Génie Chimique Langues : Anglais (eng) Mots-clés : Ledinegg  instability  Transient  simulation  Two-phase  flows  Thermal-hydraulic  instabilities  Adaptive  method Résumé : Ledinegg flow excursion could produce severe damage in thermal-hydraulic components due to fast changes in the main thermodynamic variables. In this work, we study this phenomenon simulating the transient behavior of the system during these excursive transitions. We also study how the dynamic delays modify the pressure drop vs. flow characteristic curve. Numerical aspects related to the application of an adaptive high-order method to the resolution of these complex thermal-hydraulic problems are discussed. ISSN : 1875-5100 En ligne : http://www.sciencedirect.com/science/article/pii/S1875510010000661 [article] Dynamic simulation of Ledinegg instability [texte imprimé] / L.C. Ruspini, Auteur ; C. A. Dorao, Auteur ; M. Fernandino, Auteur . - 2012 . - pp. 211–216. Génie Chimique Langues : Anglais (eng) in Journal of natural gas science and engineering > Vol. 2 N° 5 (Novembre 2010) . - pp. 211–216 Mots-clés : Ledinegg  instability  Transient  simulation  Two-phase  flows  Thermal-hydraulic  instabilities  Adaptive  method Résumé : Ledinegg flow excursion could produce severe damage in thermal-hydraulic components due to fast changes in the main thermodynamic variables. In this work, we study this phenomenon simulating the transient behavior of the system during these excursive transitions. We also study how the dynamic delays modify the pressure drop vs. flow characteristic curve. Numerical aspects related to the application of an adaptive high-order method to the resolution of these complex thermal-hydraulic problems are discussed. ISSN : 1875-5100 En ligne : http://www.sciencedirect.com/science/article/pii/S1875510010000661

Effect of interfacial waves on turbulence structure in stratified duct flows / M. Fernandino in Transactions of the ASME . Journal of fluids engineering, Vol. 130 N° 6 (Juin 2008) 

Public ISBD [article]  in Transactions of the ASME . Journal of fluids engineering > Vol. 130 N° 6 (Juin 2008) . - 8 p. Titre : Effect of interfacial waves on turbulence structure in stratified duct flows Type de document : texte imprimé Auteurs : M. Fernandino, Auteur ; T. Ytrehus, Auteur Année de publication : 2009 Article en page(s) : 8 p. Note générale : Fluids engineering Langues : Anglais (eng) Résumé : Stratified flows are encountered in many industrial applications. The determination of the flow characteristics is essential for the prediction of pressure drop and holdup in the system. The aim of this study is to gain insight into the interaction of a gas and a liquid phase flowing in a stratified regime, with especial focus on the effect of interfacial waves on the turbulence structure of the liquid phase. Measurements of mean velocities and turbulent intensities in the liquid phase of a stratified air-water duct flow are performed. Mean velocity profiles and turbulence structure are affected differently for different wave amplitudes. The effect of small amplitude waves is restricted to the near-interface region, resembling the effect of increasing shear rate on a flat interface. On the other hand, large amplitude waves modify the flow structure throughout the whole liquid depth. The mean velocity is greatly enhanced, resulting in a higher bulk velocity. Turbulent intensities are also significantly enhanced especially in the interface region. This big difference in flow structure is not observed after the appearance of the first waves but rather when a certain critical wave amplitude is triggered, indicating that the prediction of this critical wave type turns out to be more important than the determination of the transition from a smooth to a stratified wavy regime. En ligne : http://fluidsengineering.asmedigitalcollection.asme.org/Issue.aspx?issueID=27318 [...] [article] Effect of interfacial waves on turbulence structure in stratified duct flows [texte imprimé] / M. Fernandino, Auteur ; T. Ytrehus, Auteur . - 2009 . - 8 p. Fluids engineering Langues : Anglais (eng) in Transactions of the ASME . Journal of fluids engineering > Vol. 130 N° 6 (Juin 2008) . - 8 p. Résumé : Stratified flows are encountered in many industrial applications. The determination of the flow characteristics is essential for the prediction of pressure drop and holdup in the system. The aim of this study is to gain insight into the interaction of a gas and a liquid phase flowing in a stratified regime, with especial focus on the effect of interfacial waves on the turbulence structure of the liquid phase. Measurements of mean velocities and turbulent intensities in the liquid phase of a stratified air-water duct flow are performed. Mean velocity profiles and turbulence structure are affected differently for different wave amplitudes. The effect of small amplitude waves is restricted to the near-interface region, resembling the effect of increasing shear rate on a flat interface. On the other hand, large amplitude waves modify the flow structure throughout the whole liquid depth. The mean velocity is greatly enhanced, resulting in a higher bulk velocity. Turbulent intensities are also significantly enhanced especially in the interface region. This big difference in flow structure is not observed after the appearance of the first waves but rather when a certain critical wave amplitude is triggered, indicating that the prediction of this critical wave type turns out to be more important than the determination of the transition from a smooth to a stratified wavy regime. En ligne : http://fluidsengineering.asmedigitalcollection.asme.org/Issue.aspx?issueID=27318 [...]