Equipe MSSM

Almis Marmoucha, Morocco

Equipe MSSM

Almis Marmoucha, Morocco

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Khamlichi A.,Equipe MSSM | Khamlichi A.,CNRS Tribology and Dynamic Systems Laboratory | Khamlichi A.,French National Center for Scientific Research | Yakhlef F.,Equipe MSSM | And 17 more authors.
Physical and Chemical News | Year: 2010

Internal erosion is a process of progressive degradation which occurs in soils containing fines under the action of a flowing fluid. This phenomenon could yield catastrophic damages to hydraulic infrastructures. A generalized modelling which enables simulating internal erosion phenomenon has been proposed recently. Simulation results obtained by this model have demonstrated its capacity to predict various mechanisms associated to internal erosion. In this work, this modelling is applied in order to study the relative influence of some factors on the maximum erosion rate and on the maximum concentration of fluidized solid produced by erosion. A statistical technique based on Taguchi design of experiment is used. Are considered in the analysis five factors which include two parameters linked to soil resistance against erosion, the soil critical porosity, the initial soil permeability and the initial confining pressure. It is shown that the maximum erosion rate is largely monitored by soil permeability and that the maximum concentration of fluidized solid is mainly controlled by soil porosity.


Yakhlef F.,Equipe MSSM | Yakhlef F.,Institut Universitaire de France | Khamlichi A.,Equipe MSSM | Khamlichi A.,Institut Universitaire de France | And 4 more authors.
Physical and Chemical News | Year: 2010

The objective of this study is to model the behaviour of a gas jet impacting a metal bath in order to protect its surface against oxidation. This process is often used in metallurgical industry. The gas and the liquid flows are modelled using the volumes of fluid technique (VOF). The equations of the problem are formulated using the density and the viscosity of the gas-liquid mixture which are expressed in terms of phase volume fractions. The k-ε model is used to describe the turbulence of gas. The equations of the problem are solved in cartesian coordinates using the commercial code CFD, Fluent. Focus is done in this work on speed and pressure field variations over the metallic bath surface as function of the gas jet rate, the jet inclination angle and the gas nature. The obtained results, according to various parametric studies, make it possible to analyze the modified morphology of the treated zone. The aim is obtaining the most regular possible metal bath surface after performing a gas jet treatment.

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