A combination of computational fluid dynamics (CFD) and Lagrangian particle tracking has been used to predict two-phase erosion-corrosion in a three-dimensional, square-sectioned U-bend. A commercial CFD code has been used to predict fluid flow fields using the k-ε turbulence model. These predictions have been verified against experimental results. Mass-transfer-controlled oxygen corrosion was calculated using species concentration fields. The Lam-Bremhorst low Reynolds number modification was used in near-wall regions to accurately resolve the diffusional-controlled sublayer. A Lagrangian particle tracking algorithm coupled with the eddy interaction model has been developed and verified for turbulent particle dispersion. Erosion has been predicted from wall impact data through the use of an empirical erosion model. Erosion rates for sand particles are presented. The effect of Reynolds number and bend orientation on erosion rates was investigated. Predictions of two-phase erosion-corrosion are presented.

Subject
Erosion models, Sand, Corrosion rate, Predicted corrosion rate, Turbulent flow, Walls, Motion, Reynolds number, Mass transfer, Experimental data, U bends, Erosion, Erosion corrosion
Keywords:
computational fluid dynamics, erosion-corrosion, hydrodynamics, Lagrangian particle tracking, mass transfer, three-dimensional U-bend
NACE International
2001
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