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• W2034846872 abstract "Abstract Impact by sand particles entrained in gas or oil product streams from down-hole well completions often causes erosive damage to the surface of sand filtration screens, heat exchangers, pipes, pipe bends, valves, gas compressors and other equipment. It is of major interest to develop designs to minimise the erosion damage. Erosion is often found to be unevenly distributed, for example erosion in a pipe elbow. Localized deep material loss or holing can lead to functional failure even though other areas of the component surface may be still undamaged. It was found that component design/geometry could often be modified to alter the flow field and even-out the erosion distribution, thus reducing the localized high erosion rate and extending the equipment service life. The optimization process can be most effectively carried out with assistance from erosion flow modelling. The objective of this paper is to describe the latest erosion flow modelling technique used at CSIRO, Australia. The technique consists of a combined laboratory physical modelling and computational fluid dynamics (CFD) approach. The physical modelling employs a paint modelling technique to illustrate the erosion patterns and advanced metrology for quantitative erosion measurements. Both of these data sets are also used to validate and improve CFD erosion modelling. The paper will show a series of case studies of erosion prediction and an example of erosion reduction through geometrical modifications with the materials used unchanged. Introduction Surface erosion of materials by solid particle impact is a problem in many types of multiphase flow industrial equipment. It is a general practice in industry to use wear-resistant materials or to use coatings/surface treatments to reduce the erosion rate. This paper focuses on the research aimed at reducing the erosion of a material surface by modifying its flow geometry, without changing the material properties. This fluid mechanics-based approach is justified as erosion rate is sensitive to the flow-field, since erosion is a function of particle velocity and particle impingement angle (Finnie 1960, Laitone, 1979; Humphrey, 1990; Finnie, 1995; Omote et al., 1995; Zhang et al., 2000), for a given material and physical properties of the particles. For example, the Finnie (1960) model often used in CFD predictions of erosion is given as: Eq. (1) where E - mass eroded divided by total mass of particles impinging on surface; k- constant depending on material properties (e.g. hardness of particles and target materials); V - particle impingement velocity; n - empirical coefficient, n=1.8–2.3 for ductile material, n=2.0–4.0 for brittle materials; a- particle impingement angle, f(a) is a dimensionless function dependent on material. Erosion is often found to be unevenly distributed over material surfaces in plant and equipment. Localized deep material loss or holing can lead to functional failure even though most of the equipment may be still undamaged. Figure 1(a), (b) and (c) show some erosion examples experienced in the mineral industry. It is reasoned that the flow geometry could be modified to alter the flow-field, to even out the erosion distribution, thus reducing the local maximum erosion rate and extending the equipment functional life." @default.
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• W2034846872 date "2009-10-04" @default.
• W2034846872 modified "2023-10-16" @default.
• W2034846872 title "Laboratory Modeling of Equipment Erosion by Sand Particles" @default.
• W2034846872 doi "https://doi.org/10.2118/124108-ms" @default.
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