Titre :	Etude du comportement dynamique et thermique de fluides viscoelastiques dans des conduites de sections non-circulaires
Type de document :	texte imprimé
Auteurs :	Abdelkader Filali, Auteur ; Z. Nemouchi, Directeur de thèse ; Lyes Khezzar, Directeur de thèse
Editeur :	constantine [Algérie] : Université Constantine 1
Année de publication :	2014
Importance :	98 f.
Format :	30 cm.
Note générale :	2 copies imprimées disponibles
Langues :	Français (fre)
Catégories :	Français - Anglais Génie Mécanique
Tags :	Viscoélastique  problème de Graetz  modèle simplifié Phan-Thien-Tanner SPTT  modèle FENE-P  convection à l’entrée d’une conduite  nombre de Nusselt  Viscoelastic  Graetz problem  Simplified Phan-Thien-Tanner model SPTT  FENE-P model  entry flow heat transfer  Nusselt number  اللزجة  Graetz المشكلة  نموذجي التمثيل الرقمي SPTT و FENE-P  تعزيز النقل الحراري  معامل نقل الحرارة ?
Index. décimale :	620 Génie Mécanique
Résumé :	The present work is dedicated to the study of the Graetz problem in straight pipes of circular and non-circular cross-sections to analyze the influence of the rheological parameters on the heat transfer enhancement with negligible viscous dissipation for a class of non-linear viscoelastic fluids constitutively represented by the simplified Phan-Thien-Tanner (SPTT) and the Finite Extensible Nonlinear Elastic-Peterlin (FENE-P) models. Numerical simulation is conducted using the finite element based software POLYFLOW and results are compared with analytical and semi-analytical solutions available in the literature for the 2D axisymmetric pipes. The analysis considers a constant wall heat flux boundary condition and results shows that for the SPTT model the combined elastic and shear-thinning effects represented by the parameter εWe2 lead to heat transfer enhancement. For the FENE-P model, the results show that an increase in fluid elasticity raised the normalized heat transfer coefficient due to the increased level of shear-thinning behavior. But increasing the extensibility parameter L2 leads to a decrease in Nusselt number. Nusselt number values are obtained for the axisymmetric pipe flows for several values of polymer concentration β and the study confirms quantitatively that polymer concentration enhances heat transfer rates in FENE-P fluids. The Nusselt number distribution in the entrance region of tubes of equilateral triangular, square and rectangular cross-sections is reported for the first time for nonlinear viscoelastic fluids of the SPTT and FENE-P type.
Diplôme :	Doctorat en sciences
En ligne :	../theses/gmecanique/FIL6487.pdf
Format de la ressource électronique :	pdf
Permalink :	https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=9534

Etude du comportement dynamique et thermique de fluides viscoelastiques dans des conduites de sections non-circulaires [texte imprimé] / Abdelkader Filali, Auteur ; Z. Nemouchi, Directeur de thèse ; Lyes Khezzar, Directeur de thèse . - constantine [Algérie] : Université Constantine 1, 2014 . - 98 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)

Catégories :	Français - Anglais Génie Mécanique
Tags :	Viscoélastique  problème de Graetz  modèle simplifié Phan-Thien-Tanner SPTT  modèle FENE-P  convection à l’entrée d’une conduite  nombre de Nusselt  Viscoelastic  Graetz problem  Simplified Phan-Thien-Tanner model SPTT  FENE-P model  entry flow heat transfer  Nusselt number  اللزجة  Graetz المشكلة  نموذجي التمثيل الرقمي SPTT و FENE-P  تعزيز النقل الحراري  معامل نقل الحرارة ?
Index. décimale :	620 Génie Mécanique
Résumé :	The present work is dedicated to the study of the Graetz problem in straight pipes of circular and non-circular cross-sections to analyze the influence of the rheological parameters on the heat transfer enhancement with negligible viscous dissipation for a class of non-linear viscoelastic fluids constitutively represented by the simplified Phan-Thien-Tanner (SPTT) and the Finite Extensible Nonlinear Elastic-Peterlin (FENE-P) models. Numerical simulation is conducted using the finite element based software POLYFLOW and results are compared with analytical and semi-analytical solutions available in the literature for the 2D axisymmetric pipes. The analysis considers a constant wall heat flux boundary condition and results shows that for the SPTT model the combined elastic and shear-thinning effects represented by the parameter εWe2 lead to heat transfer enhancement. For the FENE-P model, the results show that an increase in fluid elasticity raised the normalized heat transfer coefficient due to the increased level of shear-thinning behavior. But increasing the extensibility parameter L2 leads to a decrease in Nusselt number. Nusselt number values are obtained for the axisymmetric pipe flows for several values of polymer concentration β and the study confirms quantitatively that polymer concentration enhances heat transfer rates in FENE-P fluids. The Nusselt number distribution in the entrance region of tubes of equilateral triangular, square and rectangular cross-sections is reported for the first time for nonlinear viscoelastic fluids of the SPTT and FENE-P type.
Diplôme :	Doctorat en sciences
En ligne :	../theses/gmecanique/FIL6487.pdf
Format de la ressource électronique :	pdf
Permalink :	https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=9534