Journal
WEAR
Volume 376, Issue -, Pages 516-525Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.wear.2016.11.015
Keywords
Flow velocity; Liquid-solid flow; Erosion-corrosion; Computational fluid dynamics
Funding
- Projects of National Natural Science Foundation of China [51301201]
- Shandong Provincial Natural Science Foundation, China [ZR2013EMQ014]
- Innovation Program of Qingdao City [15-9-1-70-jch]
- Science and Technology Program of Huangdao District [2014-1-52]
- Fundamental Research Funds for the Central Universities [14CX02209A, 16CX02037A]
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Erosion-corrosion is a serious problem in oil and gas gathering and transportation pipeline systems; specifically, the elbow is the weak part. Erosion-corrosion at different locations of a horizontal steel elbow through which a sand slurry was passed at different velocities was studied using weight loss measurement. Erosion samples were characterized using three-dimensional confocal microscopy and computational fluid dynamics was used to characterize the flow patterns and distribution of sand particles in the elbow. The erosion-corrosion rate increased most as the fluid velocity increased from 3.5 to 4.0 m/s. Increasing particle velocity increased the mechanical effects of the particles and induced secondary flow, leading to differing velocity contours in different cross-sections of the elbow, and thereby differing rates of erosion-corrosion. The maximum rate appeared in the outer part (annular angles phi=45, 90, and 135 degrees) and bottom of the inner part (annular angles phi =225, 270, and 315 degrees) of the elbow outlet with an axial angle between 75 and 90 degrees. (C) 2016 Elsevier B.V. All rights reserved.
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