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Convection Forcée de Fluides Viscoélastiques en Milieu Confiné by Guemmadi Messaouda

Convection Forcée de Fluides Viscoélastiques en Milieu Confiné

by Guemmadi Messaouda
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Book cover type: Paperback
  • ISBN13: 9789999333313
  • Binding: Paperback
  • Subject: N/A
  • Publisher: Eliva Press
  • Publisher Imprint: Eliva Press
  • Publication Date:
  • Pages: 184
  • Original Price: USD 64.5
  • Language: French
  • Edition: N/A
  • Item Weight: 254 grams
  • BISAC Subject(s): General

La lubrification hydrodynamique rev�t une grande importance dans le domaine industriel; d'o� la n�cessit� primordiale d'�laborer de nouveaux lubrifiants. Les propri�t�s des lubrifiants sont am�lior�es par l'ajout d'additifs chimiques, ce qui modifie consid�rablement leur comportement rh�ologique. Dans cette th�se, on consid�re l'�tude de la lubrification hydrodynamique d'un palier en utilisant un lubrifiant ayant des propri�t�s visco�lastiques d�crites par le mod�le de Maxwell g�n�ralis� (UCM). La complexit� des �quations (Quantit� de mouvement, Energie et Constitutives) coupl�es, associ�s au probl�me thermo-hydrodynamique dans une telle g�om�trie, n�cessite une r�solution plut�t num�rique. En utilisant le logiciel commercial Fluent 6.3 associ� � un code de calcul d�velopp� en C++, via des fonctions d�finies par des UDFs (User Defined Functions) et des UDSs (User Defined Scalars), nous �tudions premi�rement le cas o� l'arbre et le coussinet sont d'abord concentriques. La motivation de ce test est destin�e � comparer les r�sultats avec la solution analytique; ce qui permet de valider les r�sultats num�riques par l'utilisation du code d�velopp� en C++ et aussi de donner une assurance pour utiliser ce code dans la simulation num�rique de plusieurs probl�mes de lubrification plus compliqu�s. Le deuxi�me probl�me trait� est la lubrification hydrodynamique des paliers par le fluide de Maxwell g�n�ralis� (UCM) avec une viscosit� qui varie en fonction de la temp�rature. Dans ce cas, on d�termine plusieurs grandeurs m�caniques � savoir: la distribution du champ de pression, le champ de vitesse, le champ de temp�rature, le champ de contraintes et la charge portante, ainsi que les effets des param�tres visco�lastiques du fluide (temps de relaxation et viscosit�) cin�matique (vitesse de rotation de l'arbre) et enfin g�om�trique (excentricit� du palier). MOTS CLES: CFD, Fluide non Newtonien, Fluides visco�lastiques, Lubrification, Mod�le de Maxwell, nombre de Deborah, Paliers, Rh�ologie, Thermo-visco-�lasto-hydrodynamique.

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