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See detailModélisation des conditions d’apparition du micro-hydrodynamisme via la méthode des éléments finis dans la perspective d’intégrer ce phénomène dans un modèle numérique de laminage à froid.
Carretta, Yves ULg

Doctoral thesis (2014)

This dissertation presents a finite element numerical model able to predict the occurrence of Micro-Plasto-Hydrodynamic (MPH) lubrication. This phenomenon, which was first introduced by Mizuno and Okamoto ... [more ▼]

This dissertation presents a finite element numerical model able to predict the occurrence of Micro-Plasto-Hydrodynamic (MPH) lubrication. This phenomenon, which was first introduced by Mizuno and Okamoto, appears in the mixed lubrication regime. It consists in lubricant flows at the microscopic scale leading to a lubrication of the tool-piece solid contacts and therefore to a local friction drop. For instance, Laugier et al. have observed a friction decrease while rolling High Strength Steels for different strip thickness reductions. The only physical explanation to this trend is the MPH lubrication. Despite the huge influence of MPH lubrication on friction in metal forming processes, only a few numerical models can be found in the literature. Moreover, these models rely on several restrictive assumptions which prevent them from delivering predictive results. This work consists in the development of the first finite element model capable of predicting the appearance of the MPH lubrication. This model is used to numerically reproduce the experiments of Bech who studied this phenomenon, in plane strip drawing, by observing the behaviour of macroscopic pyramidal lubricant cavities through a transparent die. In the proposed approach, plane strip drawing is modelled in 2D with Metafor, an in-house nonlinear FE code. This model allows us to compare the lubricant pressure to the solid-solid contact pressure profile between the upper die and the strip material. Once the lubricant pressure exceeds the solid-to-solid contact pressure, the condition allowing a lubricant flow from the pocket to the neighbouring plateaus is fulfilled. The presented FE model is able to predict backward and forward escapes of the lubricant from the pocket. As in the experiments of Bech, several parametric studies have been carried out. The numerical results show that the model reproduces the trends observed experimentally. [less ▲]

Detailed reference viewed: 91 (25 ULg)
See detailModélisation des couplages entre eau souterraine, rivières et mer
Dassargues, Alain ULg

Scientific conference (1999, March 25)

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See detailModélisation des échanges thermiques et de la circulation d'air dans un lit bactérien
Nicolas, Jacques ULg; Vasel, Jean-Luc ULg

in Revue des Sciences de l'Eau = Journal of Water Science (1990), 3(3), 303-324

The temperature is one of the main parameters governing the biological reactions in a trickling filter. The present model proposes a set of equations applicable for the determination of a temperature ... [more ▼]

The temperature is one of the main parameters governing the biological reactions in a trickling filter. The present model proposes a set of equations applicable for the determination of a temperature profile, and therefore of an average temperature, inside the trickling filter, when the flowrate and the temperature at entry of the liquid, the ambient air conditions (temperature and humidity) and the thermal exchange coefficients of the tower are known. Moreover, the airflow induced by natural draft is also computed when the head loss coefficients in the media and at entry are known. Beside this formulation, the first results of modal fitting on pilot plants are discussed. With few further developments, the method could be useful for the optimization of the operating temperature in a trickling filter which guarantees a sufficient airflow rate in the tower. [less ▲]

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See detailModélisation des Écoulements Hydrologiques Quasi-Tridimensionnels : Problèmes Théoriques et Numériques
Pirotton, Michel ULg

in Tribune de l'Eau (La) (1995), 48(573), 19-26

Detailed reference viewed: 11 (0 ULg)
Peer Reviewed
See detailModélisation des effets chimiques dans les argiles partiellement saturées.
Boukpeti, N.; Liu, Z.; Charlier, Robert ULg

in Journées Nationales de Géotechnique et de Géologie de l'Ingénieur (2004, June)

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See detailModélisation des grands systèmes chimiques: travaux pratiques
Gerkens, Carine; Leruth, Alexandre; Léonard, Grégoire ULg et al

Learning material (2012)

Notes de Travaux pratiques à l'attention des étudiants 1ere master ingénieur civil chimiste et sciences des matériaux

Detailed reference viewed: 76 (0 ULg)
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See detailModélisation des impacts des changements climatiques sur les ressources en eaux souterraines
Dassargues, Alain ULg

Scientific conference (2004, March 15)

Detailed reference viewed: 23 (2 ULg)
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See detailModélisation des impacts des changements climatiques sur les ressources en eaux souterraines
Dassargues, Alain ULg

Scientific conference (2004, March 17)

Detailed reference viewed: 14 (0 ULg)