Gamal Zeggwagh - Academia.edu (original) (raw)
Papers by Gamal Zeggwagh
La Houille Blanche, 1998
ABSTRACT A numerical study concerning pulsatile flow of an inelastic fluid through anisotropic po... more ABSTRACT A numerical study concerning pulsatile flow of an inelastic fluid through anisotropic porous viscoelastic pipes is presented. The objective is to investigate the effects of porosity, anisotropy and viscoelasticity of pipe wall material for a generalized Casson fluid. A numerical iterative difference method is used to solve the equations, and to determine the axial and radial velocity profiles, the pressure, the flow rate and the flow rate filtration distributions and the wall axial and radial displacements. This study, considered as a step in the modelling of flow in blood vessels, may also contribute to other important fields such as water desalination or industrial flows.
Journal of Hydraulic Research, 2001
ABSTRACT This survey treats the mathematical pattern that describes the solute transport in the u... more ABSTRACT This survey treats the mathematical pattern that describes the solute transport in the unsaturated zone of a porous media conducting the contamination to the groundwater. This problem is the result of the combination of three essential processes: water flow in the porous media, the heat transfer and the transport of the polluting agent. The governing equations are non-linear and present a very strong coupling. A numerical approach based on the finite difference method, for the resolution of one-dimensional problem is proposed.
Journal of Hydraulic Research, 1997
ABSTRACT A numerical solution of pulsatile flow of an inelastic fluid through porous isotropic el... more ABSTRACT A numerical solution of pulsatile flow of an inelastic fluid through porous isotropic elastic pipes is presented. An implicit difference method is used to solve the equations, and to determine the pressure and the flow rate. This study is considered as a step in modelling of flow in blood vessels, but it may also contribute to other important fields such as water desalination or gel filtration.
ITBM-RBM, 2002
L'objectif du present travail est la r&solution des systemes des equations qui gouvernent les eco... more L'objectif du present travail est la r&solution des systemes des equations qui gouvernent les ecoulements pulses de fluides a deux phases : fluide non Newtonien-fluide Newtonien dans trois types de conduites (rigide, elastique, viscoelastique). Ce type d'ecoulement est rencontre en microcirculation sanguine. A I'aide d'une methode numerique iterative aux differences finies qui couple a chaque iteration les systemes des equations integrales et locales nous determinons les profils des vitesses axiales et les distributions temporelles des debits, des rayons et des pressions en chaque section du conduit. 0 2002 Editions scientifiques et medicales Elsevier SAS Bcoulements pulJs/ fluides a deux phases/ microcirculationl parol vlsc&lastique Abstract -Pulsating flow of two phases in deformable or rigide tubes. A numerical solution of pulsatile flow of two-phases non Newtonian fluid -Newtonian fluid through three different tubes (rigid, elastic, viscoelastic) is presented. The type of this flow exists in blood microcirculation. The iterative process with an implicit difference method is used to solve the both local and integral systems, and to determine the axial velocity profiles, the pressure, the flow rate and the radius distributions at all sections and at every moment. 0 2002 Editions scientifiques et m.Gditales Elsevier SAS microcirculation I pulsating flow I two-phase fluids I viscoelastic pipa * Correspondance et tire% 2 part.
Comptes Rendus de l Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy
We perform a theoretical study on the pulsatile flow of an inelastic fluid through anisotropic po... more We perform a theoretical study on the pulsatile flow of an inelastic fluid through anisotropic porous viscoelastic pipes. The objective is to investgate the effects of porosity, conicity, anisotropy and viscoelasticity of the pipe wall material for a generalized Casson fluid. An implicit difference method is used to solve the equations and to determine axial and radial velocity profiles, pressure, flow rate and flow rate filtration distributions, transverse rotation, and axial and radial wall displacements. This study can be applied to the modelling of blood flows in vessels, as well as to the water desalination or gel filtration.
Comptes Rendus de l Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy
We consider pulsatile flows of inelastic fluid through porous anisotropic elastic ducts. The obje... more We consider pulsatile flows of inelastic fluid through porous anisotropic elastic ducts. The objective is to investigate the effects of anisotropy of pipe wall material for a generalized Casson fluid. Using an implicit difference method to solve the equations, we determine the axial and radial velocity profiles, the pressure, the flow rate and the flow rate filtration distributions, and the wall axial and radial displacement. This study, considered as a modelling of flows in blood vessels, can also be applied to other problems such as water desalination or gel filtration.
Comptes Rendus de l Académie des Sciences - Series IIB - Mechanics
We describe numerical modeling of two-dimensional diffusion-reaction-transport processes in a por... more We describe numerical modeling of two-dimensional diffusion-reaction-transport processes in a porous unsaturated media (area located in Mnasra, Kénitra, Morocco). An implicit difference method (ADI) is used to solve the equations and to determine the reduced fluid saturation and the profile of pollutant concentration.
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy, 1998
The present work deals with a two-fluid model for blood flow through deformable tubes of small di... more The present work deals with a two-fluid model for blood flow through deformable tubes of small diameter. The two-fluid flow consists of a core (suspension of red cells) and a peripheral red cell free plasma layer. From this model, taking into account the two-phase ...
La Houille Blanche, 2001
ABSTRACT The present work deals with a two-fluid model for blood flow through deformable tubes of... more ABSTRACT The present work deals with a two-fluid model for blood flow through deformable tubes of small diameter. This two-f1uid model consists of a core (suspension of red cells) and peripheral red cell free plasma layer. The core has been considered as an Ostwaldian fluid and the plasma layer as a Newtonian fluid. Using an implicit finite differences method to solve the equations governing such flows, we have determined the global quantities for three kinds of ducts : rigid, elastic and viscoelastic. This study modeling the flow in blood vessels, can also contribute to other important fields such as water desalination or gel filtration.
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy, 1998
A theoretical study concerning the pulsatile flow of an inelastic fluid through anisotropic porou... more A theoretical study concerning the pulsatile flow of an inelastic fluid through anisotropic porous viscoelastic pipes is presented. The objective is to investigate the effects of porosity, conicity in pause, anisotropy and viscoelasticity of pipe wall material for a generalized ...
International Review of Mechanical Engineering (IREME), 2014
Revue Marocaine des …, 2011
Résumé L'objet du présent travail consiste à mettre en évidence, dans un écoulement pulsé, c... more Résumé L'objet du présent travail consiste à mettre en évidence, dans un écoulement pulsé, certains effets caractéristiques dus au comportement plastique du fluide, au comportement élastique isotrope de la paroi et à sa porosité. À l'aide d'une méthode numérique itérative ...
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics, 2000
Reçu le 26 octobre 1999, accepté après révision le 5 avril 2000)
Le but de ce travail est la modélisation numérique du régime thermique dans les écoulements plast... more Le but de ce travail est la modélisation numérique du régime thermique dans les écoulements plastiques de polymères fondus.À l'aide d'une méthode numérique itérative aux différences finies, on détermine la vitesse axiale et la température pour chaque section et à chaque instant. Les résultats obtenus, dans cette étude, peuvent contribuer à une meilleure élaboration de ce type d'écoulement. Mots clé : Écoulements plastiques -Régimes thermiques -Polymères fondus -Fluide de Casson généralise -Paroi cylindrique 1 The purpose ofthis work is the numerical modelisation ofthe thermal rules in fondus plastic flows molten polymers An iterative difference method is used to solve the system of Stokes and energy equations, we determine the axial velocities and the temperature for an sections and at every time. The obtained results can contribuate to elaborate more accurate studies on the thermal rules.
La Houille Blanche, 1998
ABSTRACT A numerical study concerning pulsatile flow of an inelastic fluid through anisotropic po... more ABSTRACT A numerical study concerning pulsatile flow of an inelastic fluid through anisotropic porous viscoelastic pipes is presented. The objective is to investigate the effects of porosity, anisotropy and viscoelasticity of pipe wall material for a generalized Casson fluid. A numerical iterative difference method is used to solve the equations, and to determine the axial and radial velocity profiles, the pressure, the flow rate and the flow rate filtration distributions and the wall axial and radial displacements. This study, considered as a step in the modelling of flow in blood vessels, may also contribute to other important fields such as water desalination or industrial flows.
Journal of Hydraulic Research, 2001
ABSTRACT This survey treats the mathematical pattern that describes the solute transport in the u... more ABSTRACT This survey treats the mathematical pattern that describes the solute transport in the unsaturated zone of a porous media conducting the contamination to the groundwater. This problem is the result of the combination of three essential processes: water flow in the porous media, the heat transfer and the transport of the polluting agent. The governing equations are non-linear and present a very strong coupling. A numerical approach based on the finite difference method, for the resolution of one-dimensional problem is proposed.
Journal of Hydraulic Research, 1997
ABSTRACT A numerical solution of pulsatile flow of an inelastic fluid through porous isotropic el... more ABSTRACT A numerical solution of pulsatile flow of an inelastic fluid through porous isotropic elastic pipes is presented. An implicit difference method is used to solve the equations, and to determine the pressure and the flow rate. This study is considered as a step in modelling of flow in blood vessels, but it may also contribute to other important fields such as water desalination or gel filtration.
ITBM-RBM, 2002
L'objectif du present travail est la r&solution des systemes des equations qui gouvernent les eco... more L'objectif du present travail est la r&solution des systemes des equations qui gouvernent les ecoulements pulses de fluides a deux phases : fluide non Newtonien-fluide Newtonien dans trois types de conduites (rigide, elastique, viscoelastique). Ce type d'ecoulement est rencontre en microcirculation sanguine. A I'aide d'une methode numerique iterative aux differences finies qui couple a chaque iteration les systemes des equations integrales et locales nous determinons les profils des vitesses axiales et les distributions temporelles des debits, des rayons et des pressions en chaque section du conduit. 0 2002 Editions scientifiques et medicales Elsevier SAS Bcoulements pulJs/ fluides a deux phases/ microcirculationl parol vlsc&lastique Abstract -Pulsating flow of two phases in deformable or rigide tubes. A numerical solution of pulsatile flow of two-phases non Newtonian fluid -Newtonian fluid through three different tubes (rigid, elastic, viscoelastic) is presented. The type of this flow exists in blood microcirculation. The iterative process with an implicit difference method is used to solve the both local and integral systems, and to determine the axial velocity profiles, the pressure, the flow rate and the radius distributions at all sections and at every moment. 0 2002 Editions scientifiques et m.Gditales Elsevier SAS microcirculation I pulsating flow I two-phase fluids I viscoelastic pipa * Correspondance et tire% 2 part.
Comptes Rendus de l Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy
We perform a theoretical study on the pulsatile flow of an inelastic fluid through anisotropic po... more We perform a theoretical study on the pulsatile flow of an inelastic fluid through anisotropic porous viscoelastic pipes. The objective is to investgate the effects of porosity, conicity, anisotropy and viscoelasticity of the pipe wall material for a generalized Casson fluid. An implicit difference method is used to solve the equations and to determine axial and radial velocity profiles, pressure, flow rate and flow rate filtration distributions, transverse rotation, and axial and radial wall displacements. This study can be applied to the modelling of blood flows in vessels, as well as to the water desalination or gel filtration.
Comptes Rendus de l Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy
We consider pulsatile flows of inelastic fluid through porous anisotropic elastic ducts. The obje... more We consider pulsatile flows of inelastic fluid through porous anisotropic elastic ducts. The objective is to investigate the effects of anisotropy of pipe wall material for a generalized Casson fluid. Using an implicit difference method to solve the equations, we determine the axial and radial velocity profiles, the pressure, the flow rate and the flow rate filtration distributions, and the wall axial and radial displacement. This study, considered as a modelling of flows in blood vessels, can also be applied to other problems such as water desalination or gel filtration.
Comptes Rendus de l Académie des Sciences - Series IIB - Mechanics
We describe numerical modeling of two-dimensional diffusion-reaction-transport processes in a por... more We describe numerical modeling of two-dimensional diffusion-reaction-transport processes in a porous unsaturated media (area located in Mnasra, Kénitra, Morocco). An implicit difference method (ADI) is used to solve the equations and to determine the reduced fluid saturation and the profile of pollutant concentration.
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy, 1998
The present work deals with a two-fluid model for blood flow through deformable tubes of small di... more The present work deals with a two-fluid model for blood flow through deformable tubes of small diameter. The two-fluid flow consists of a core (suspension of red cells) and a peripheral red cell free plasma layer. From this model, taking into account the two-phase ...
La Houille Blanche, 2001
ABSTRACT The present work deals with a two-fluid model for blood flow through deformable tubes of... more ABSTRACT The present work deals with a two-fluid model for blood flow through deformable tubes of small diameter. This two-f1uid model consists of a core (suspension of red cells) and peripheral red cell free plasma layer. The core has been considered as an Ostwaldian fluid and the plasma layer as a Newtonian fluid. Using an implicit finite differences method to solve the equations governing such flows, we have determined the global quantities for three kinds of ducts : rigid, elastic and viscoelastic. This study modeling the flow in blood vessels, can also contribute to other important fields such as water desalination or gel filtration.
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy, 1998
A theoretical study concerning the pulsatile flow of an inelastic fluid through anisotropic porou... more A theoretical study concerning the pulsatile flow of an inelastic fluid through anisotropic porous viscoelastic pipes is presented. The objective is to investigate the effects of porosity, conicity in pause, anisotropy and viscoelasticity of pipe wall material for a generalized ...
International Review of Mechanical Engineering (IREME), 2014
Revue Marocaine des …, 2011
Résumé L'objet du présent travail consiste à mettre en évidence, dans un écoulement pulsé, c... more Résumé L'objet du présent travail consiste à mettre en évidence, dans un écoulement pulsé, certains effets caractéristiques dus au comportement plastique du fluide, au comportement élastique isotrope de la paroi et à sa porosité. À l'aide d'une méthode numérique itérative ...
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics, 2000
Reçu le 26 octobre 1999, accepté après révision le 5 avril 2000)
Le but de ce travail est la modélisation numérique du régime thermique dans les écoulements plast... more Le but de ce travail est la modélisation numérique du régime thermique dans les écoulements plastiques de polymères fondus.À l'aide d'une méthode numérique itérative aux différences finies, on détermine la vitesse axiale et la température pour chaque section et à chaque instant. Les résultats obtenus, dans cette étude, peuvent contribuer à une meilleure élaboration de ce type d'écoulement. Mots clé : Écoulements plastiques -Régimes thermiques -Polymères fondus -Fluide de Casson généralise -Paroi cylindrique 1 The purpose ofthis work is the numerical modelisation ofthe thermal rules in fondus plastic flows molten polymers An iterative difference method is used to solve the system of Stokes and energy equations, we determine the axial velocities and the temperature for an sections and at every time. The obtained results can contribuate to elaborate more accurate studies on the thermal rules.