PSI - Issue 13

M. Amara et al. / Procedia Structural Integrity 13 (2018) 2137–2142 Author name / Structural Integrity Procedia 00 (2018) 000–000

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in the bends show that the studies started on the types of bends are limited to the reduction of the erosion-corrosion [2,3], the local conditions of flow determine the local distribution of the flow which pushes the accelerating factors of the phenomenon of erosion-corrosion [4]. The factors influencing erosion-corrosion include the surface conditions and the environmental material on the damage of steel-oil pipes [5]. The amount of weight loss erosion-corrosion is superior to erosion-induced weight loss due to the synergistic effect of erosion resulting from the striking of the metal surface by suspended erosive materials and the corrosive environment accelerates the corrosion. The geometric parameters modifying the bends of the branches plays an important role on the corrosion rate by reducing on the impact of the drops [6]. The erosion of solid particles in a pipe curvature was studied by numerical simulation and compared to the experimental data [7]. An experimental study of [8] shows that the erosion rates increase linearly with the increasing of flow velocities and the levels of sand contamination. Special attention was therefore paid to the movement of particle history in driving ahead of the real point of interest [9], the particle trajectory was calculated using the Lagrangian model that provides particle movement in the pipeline and their effects on the inner walls of the pipeline [10,9]. CFD software provided good erosion values as it included the operation of the pipeline / flow of fluid. A very good agreement was found between the numerical results and the experimental data. Simulate the erosion of solid particles with the Finnie erosion model [11] and the virtual wall model for collisions between particles and walls. Good results for predicting potentially sensitive locations.

Fig. 1. Deterioration of the internal surface of the elbow

The study was conducted on a tube from the Ténes desalination plant, which found a slight decrease in the internal surfaces after corrosion due to erosion, Fig. 1. After the tube examination and FTIR analysis, a high proportion of percentage of Silicium was found. The Chlef area contains three categories of sand (large, medium, small). This leads us to the hypothesis of contaminated sand that interferes with the chemical composition of the substance. For an efficient and efficient solution, we use CFD as an initial solution to understand corrosion and corrosion. Our goal is to learn how different dimensions of sand affect tube corrosion depending on the different aperture of the valve during water flow with solid particles. A three dimensional (3D) design of a geometrical elbow pipe model has created on SolidWorks with different valve opening positions (Fig. 2, 3). The study of erosion rate calculation which follows of solid particles (20 particles) and injected in the fluid is examined by two codes; SolidWorks and Ansys.

Fig. 3. ((b, c) Geometrical model of different valve opening angles (1) =90°, (2) =45°, (3) =30°, (4) =15°.

Fig. 2. (a) Geometrical model