Documents disponibles écrits par cet auteur

Computational investigations of solid-liquid particle interaction in a two-phase flow around a ducted obstruction / Manabendra Pathak in Journal of hydraulic research, Vol. 49 N° 1 (Janvier/Fevrier 2011) 

Public ISBD [article]  in Journal of hydraulic research > Vol. 49 N° 1 (Janvier/Fevrier 2011) . - pp. 96-104 Titre : Computational investigations of solid-liquid particle interaction in a two-phase flow around a ducted obstruction Type de document : texte imprimé Auteurs : Manabendra Pathak, Auteur Année de publication : 2011 Article en page(s) : pp. 96-104 Langues : Anglais (eng) Mots-clés : Algebraic  slip  mixture  model  Particle  size  Sediment  transport  Turbulence  Two-phase  flow Index. décimale : 627 Ingénierie des cours d'eau naturels, des ports, des rades et des cotes. Installations de navigation, de dragage, de récupération et de sauvetage. Barrages et centrales électriques hydrauliques Résumé : The effect of bed obstruction on the dispersion of solid particles in a two-phase flow was numerically investigated. An algebraic slip mixture model was used to model this flow and the re-normalization group k-ε model to resolve flow turbulence. Computations were performed for three different sizes of solid particles to investigate their effect on turbulence modulation. Due to the obstruction, a distortion of the self-similar mean velocity profile was observed including the typical stratified dispersion of solid particles in the region comprising the stagnation and wake regions. Its length increases with particle size. The stagnation region is characterized by high preferential deposition of particles, whereas the wake region has a low concentration gradient. The effect of wake vortices on particle dispersion decreases as the particle size increases. Turbulence intensity increases with the particle size, whereas relative turbulence modulation was observed in complex flow regions for larger-sized particles. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.informaworld.com/smpp/content~db=all~content=a933310251~frm=titlelink [article] Computational investigations of solid-liquid particle interaction in a two-phase flow around a ducted obstruction [texte imprimé] / Manabendra Pathak, Auteur . - 2011 . - pp. 96-104. Langues : Anglais (eng) in Journal of hydraulic research > Vol. 49 N° 1 (Janvier/Fevrier 2011) . - pp. 96-104 Mots-clés : Algebraic  slip  mixture  model  Particle  size  Sediment  transport  Turbulence  Two-phase  flow Index. décimale : 627 Ingénierie des cours d'eau naturels, des ports, des rades et des cotes. Installations de navigation, de dragage, de récupération et de sauvetage. Barrages et centrales électriques hydrauliques Résumé : The effect of bed obstruction on the dispersion of solid particles in a two-phase flow was numerically investigated. An algebraic slip mixture model was used to model this flow and the re-normalization group k-ε model to resolve flow turbulence. Computations were performed for three different sizes of solid particles to investigate their effect on turbulence modulation. Due to the obstruction, a distortion of the self-similar mean velocity profile was observed including the typical stratified dispersion of solid particles in the region comprising the stagnation and wake regions. Its length increases with particle size. The stagnation region is characterized by high preferential deposition of particles, whereas the wake region has a low concentration gradient. The effect of wake vortices on particle dispersion decreases as the particle size increases. Turbulence intensity increases with the particle size, whereas relative turbulence modulation was observed in complex flow regions for larger-sized particles. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.informaworld.com/smpp/content~db=all~content=a933310251~frm=titlelink

Numerical analysis of droplet dynamics under different temperature and cross-flow velocity conditions / Manabendra Pathak in Transactions of the ASME . Journal of fluids engineering, Vol. 134 N° 4 (Avril 2012) 

Public ISBD [article]  in Transactions of the ASME . Journal of fluids engineering > Vol. 134 N° 4 (Avril 2012) . - 06 p. Titre : Numerical analysis of droplet dynamics under different temperature and cross-flow velocity conditions Type de document : texte imprimé Auteurs : Manabendra Pathak, Auteur Année de publication : 2012 Article en page(s) : 06 p. Note générale : fluids engineering Langues : Anglais (eng) Mots-clés : single  liquid  droplet  formation;  cross-flow  velocities;  cross-flow  temperature Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Numerical investigations have been performed to investigate the dynamics of a single liquid droplet formation in another immiscible cross-flow liquid for different values of cross-flow velocities and temperature difference between the two phases. The transient growth of the droplet and detachment time have been calculated by solving Navier-Stokes equation for two-phase flow using coupled level-set and volume of fluid method. The effect of temperature on surface tension has been incorporated in numerical simulation by modeling the surface tension as a linear function of temperature. The effects of cross-flow velocity and temperature in the evolution and detachment of the droplet have been investigated from the balance of different forces acting on the system. With the increase in cross-flow velocity, the diameter of the droplet decreases and droplet detachment time increases. While with the increase in cross-flow temperature, both the diameter and detachment time decreases. DEWEY : 620.1 ISSN : 0098-2202 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JFEGA4000134000004 [...] [article] Numerical analysis of droplet dynamics under different temperature and cross-flow velocity conditions [texte imprimé] / Manabendra Pathak, Auteur . - 2012 . - 06 p. fluids engineering Langues : Anglais (eng) in Transactions of the ASME . Journal of fluids engineering > Vol. 134 N° 4 (Avril 2012) . - 06 p. Mots-clés : single  liquid  droplet  formation;  cross-flow  velocities;  cross-flow  temperature Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Numerical investigations have been performed to investigate the dynamics of a single liquid droplet formation in another immiscible cross-flow liquid for different values of cross-flow velocities and temperature difference between the two phases. The transient growth of the droplet and detachment time have been calculated by solving Navier-Stokes equation for two-phase flow using coupled level-set and volume of fluid method. The effect of temperature on surface tension has been incorporated in numerical simulation by modeling the surface tension as a linear function of temperature. The effects of cross-flow velocity and temperature in the evolution and detachment of the droplet have been investigated from the balance of different forces acting on the system. With the increase in cross-flow velocity, the diameter of the droplet decreases and droplet detachment time increases. While with the increase in cross-flow temperature, both the diameter and detachment time decreases. DEWEY : 620.1 ISSN : 0098-2202 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JFEGA4000134000004 [...]