Analysis of local wear variables for high-precision erosion modelling in complex geometries

Adedeji, Oluwaseun Ezekiel; Yu, Wantai; Sanders, R. Sean

doi:10.1016/j.wear.2018.12.071

Cited by 17 publications

(10 citation statements)

References 32 publications

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“…The effective diffusivity of ω; and Cω: The diffusion term. For modeling surface roughness, the rough wall model is available in ANSYS Fluent [37] which was adapted from Sommerfeld and Huber's work [38]. To implement surface roughness in ANSYS Fluent, the Roughness Height (Hr) and the Roughness Constant (C) should be defined [39].…”

Section: Modeling Of Roughness Based On Modified Law Of the Wallmentioning

confidence: 99%

“…where u i : Mean velocity; A k : The production terms of k; B k : Production terms of k; A ω : The production terms of ω; B k : Dissipation terms of k; B ω : Dissipation terms of ω; L K : The effective diffusivity of k; L ω: The effective diffusivity of ω; and C ω : The diffusion term. For modeling surface roughness, the rough wall model is available in ANSYS Fluent [37] which was adapted from Sommerfeld and Huber's work [38]. To implement surface roughness in ANSYS Fluent, the Roughness Height (H r ) and the Roughness Constant (C) should be defined [39].…”

Section: Modeling Of Roughness Based On Modified Law Of the Wallmentioning

confidence: 99%

See 1 more Smart Citation

Experimental and CFD Analysis of Impact of Surface Roughness on Hydrodynamic Performance of a Darrieus Hydro (DH) Turbine

Khanjanpour

2020

Energies

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Although improving the hydrodynamic performance is a key objective in the design of ocean-powered devices, there are some factors that affect the efficiency of the device during its operation. In this study, the impacts of a wide range of surface roughness as a tribological parameter on stream flow around a hydro turbine and its power loss are studied. A comprehensive program of 3D Computational Fluid Dynamics (CFD) modeling, as well as an expansive range of experiments were carried out on a Darrieus Hydro (DH) turbine in order to measure reduction in hydrodynamic performance due to surface roughness. The results show that surface roughness of turbine blades plays an important role in the hydrodynamics of the flow around the turbine. The surface roughness increases turbulence and decreases the active fluid energy that is required for rotating the turbine, thereby reducing the performance of the turbine. The extent of the negative impact of surface roughness on the drag coefficient, pressure coefficient, torque, and output power is evaluated. It is shown that the drag coefficient of a turbine with roughness height of 1000 μm is about 20% higher than a smooth blade (zero roughness height) and the maximum percentage of reduction of output power could be up to 27% (numerically) and 22% (experimentally).

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Section: Modeling Of Roughness Based On Modified Law Of the Wallmentioning

confidence: 99%

Section: Modeling Of Roughness Based On Modified Law Of the Wallmentioning

confidence: 99%

Experimental and CFD Analysis of Impact of Surface Roughness on Hydrodynamic Performance of a Darrieus Hydro (DH) Turbine

Khanjanpour

2020

Energies

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“…Vieira et al (2016) proposed a wall erosion model applicable to different flow rates and particle sizes by combining theory with experiment. Adedeji et al (2019) compared the numerical simulation results with the experimental data of predecessors, and found that the particle collision angle, velocity and particle mass fraction are the main influencing factors of wear. Singh et al (2019) numerically found that the magnitude and location of maximum erosion wear are more severe in bend rather than the straight pipe.…”

Section: Introductionmentioning

confidence: 99%

Study on the Impact Wear Characteristics of Catalyst Particles at 90° Elbow via CFD-DEM Coupling Method

Liu

Zhou

Gao

et al. 2022

JAFM

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In the process of petrochemical production, the catalyst particles in the hydraulic conveying pipeline often cause wear failure accidents due to collisions with wall. Compared with spherical particles, non-spherical particles' trajectory would be different due to its geometric shape, and thereby affecting the flow wear characteristics. In this paper, the shape of catalyst particle model with real aspect ratio was constructed by using multi-cluster method, and a CFD-DEM coupling method was adopted by considering the interaction between particle-particle and particle-wall. The study focuses on the effect of particle shape, radius of curvature and angle of bend in terms of the wear characteristics of liquid-solid two-phase flow. The results indicate that with the increase of the particle aspect ratio, the wear rate and the impact density of particles decrease while the impact velocity increases, the wear area of the elbow mainly distributes in the middle part of the outer wall, and its maximum position appears between 78° and 90° in polar coordinates; With the increase of pipe's curvature radius, the main wear area changes due to the direct collision and the sliding friction of the particles along the pipe wall, and its maximum wear rate shows a downward trend due to the reinforce of buffering effect; With the decrease of bending angle, The main wear area decrease because of the changes in particle flow patterns and it is mainly located in the center of the outer wall.

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“…In the literature, the relative importance of flow state and particle behavior on erosion rate has been debated using numerical and experimental techniques. Oluwaseun E. Adeeji et al [11] analyzed the local wear variables of the high-precision erosion model under the complex geometry conditions. The simulations show the dispersion of particles at the elbow is enhanced, resulting in more uniformly distributed local wear variables.…”

Section: Introductionmentioning

confidence: 99%

Multicomponent Water Effects on Rotating Machines Disk Erosion

Yang

Hou

et al. 2020

Water

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When sand particles are entrained into carrier flow, such as liquid, a strong interaction occurs with the surface of the metallic material, resulting in serious erosion damage. However, the effect of the physical properties of particles and materials on erosion characteristics has not been well studied. In this paper, the erosion-wear behavior of a rotating disc surface under the action of solid–liquid two-phase flow was studied by using the discrete particle model (DPM). The wear effects on the surface of sample due to particle diameter (d = 0.1 mm, d = 0.2 mm, d = 0.3 mm, d = 0.4 mm), particle volume fraction (CV = 2%, CV = 3%, CV = 4%, CV = 5%), and particle inlet velocity (v = 1.05 m/s, v = 2.05 m/s, v = 3.05 m/s, v = 4.05 m/s) were analyzed using representative values of operating conditions of rotating machines. The results show that the wear amount increases exponentially with the radius, whilst the maximum wear amount increases faster than the average wear amount with the particle volume fraction. The surface wear grows inversely with the particle diameter but slightly with the particle inlet velocity. A case study of stainless steel samples at different radius positions on the surface of rotating disc is carried out using a mixed velocity of sand and water of 2.05 m/s, an average particle size of 0.1 mm, and a concentration of CV = 2.5%. The experiments show the wear amount increases with the radius on the surface of the rotating disc, just as predicted by the numerical simulation. Two important findings emerge from the study: (1) the wear morphology of the specimen surface develops from two to three regions; (2) when the basal body is rotating at high speed, the wear degree is influenced more by the circumferential than particle inlet velocity. The wear morphology was observed by using a scanning electron microscope (SEM). It exhibited a mixture of fine and coarse scratches and pits, and the distribution of these varied according to the radial distance of the disc.

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Analysis of local wear variables for high-precision erosion modelling in complex geometries

Cited by 17 publications

References 32 publications

Experimental and CFD Analysis of Impact of Surface Roughness on Hydrodynamic Performance of a Darrieus Hydro (DH) Turbine

Experimental and CFD Analysis of Impact of Surface Roughness on Hydrodynamic Performance of a Darrieus Hydro (DH) Turbine

Study on the Impact Wear Characteristics of Catalyst Particles at 90° Elbow via CFD-DEM Coupling Method

Multicomponent Water Effects on Rotating Machines Disk Erosion

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