Erosion Phenomenon Caused by Water Droplet Impingement and Life Prediction of Industrial Materials: Part2-Establishment of predictive equations and evaluation of material performance

Isomoto, Yoshinori; Miyata, Hirokazu

doi:10.3323/jcorr.57.146

Cited by 17 publications

(7 citation statements)

References 12 publications

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“…Strain energy accumulated during the incubation period, so that a long incubation period indicated high microfracture resistance. After the incubation period, a constant damage-depth rate was from repeated plastic deformation and material removal, which was related to material hardness, as reported in a previous paper 13) . A longer incubation period and lower damage-depth rate was obtained for SUS316L steel with slightly higher hardness than the other steels.…”

Section: Erosion Resistance and That Of Substratesmentioning

confidence: 72%

Water Droplet Erosion Resistance of Aluminizing Diffusion Coatings on Steel Tubes

2018

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Problems with erosion caused by water droplet impingement occur in high-temperature and high-pressure pipelines and in steam turbines in energy conservation systems and power plants. Advances in material development and the use of highly resistant materials are needed in order to insure a high-performance level of plant maintenance. The use of ceramic coatings or intermetallic diffusion coatings on pipe steels is thought to be bene cial for the improvement of corrosion and erosion resistance. Aluminizing diffusion coatings on a few types of steel tubes with different coating thicknesses were prepared for this experiment. Erosion tests on water droplet impingement were conducted on the internal surface of tubes at a droplet velocity of 148 m s −1 using a water droplet testing apparatus. Erosion resistance was evaluated based on the incubation period and an average damage-depth rate for aluminizing diffusion coatings and steel substrates. Hardness distributions of the coating materials on cross-sectional surfaces revealed a harder layer on the surface, a functional gradient hard layer, and a soft steel substrate. EDX analyses on aluminizing diffusion coatings showed irregularly large grains of alumina, a microstructural intermetallic compound of Al-Fe-C with small grains of alumina, and an Al-Fe-C gradient diffusion layer toward the substrate. Good erosion resistance was obtained with a microstructural intermetallic compound layer with small grains of alumina. However, the erosion resistance of the diffusion layer with large grains of alumina was inferior. The erosion resistance depended on the combinations of the diffusion layer, alumina grains, and steel substrate, but not necessarily on the thickness of the diffusion layers. [

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Section: Erosion Resistance and That Of Substratesmentioning

confidence: 72%

Water Droplet Erosion Resistance of Aluminizing Diffusion Coatings on Steel Tubes

2018

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“…(0°) = 0, (20°) = 1.0 and (90°) = 0.3. Isomoto and Miyata (2008) proposed the following erosion model, based on the results of water jet tests.…”

Section: Models For Liquid Droplet-induced Erosionmentioning

confidence: 99%

“…. As well, Isomoto and Miyata (2008) performed the experiments of droplet induced erosion using water jets, which impinged against the specimen of different metal materials in high velocity. The effect of distance between nozzle and specimen was also investigated.…”

Section: Introductionmentioning

confidence: 99%

“…Among them, the models of Finnie, Grant and Tabakoff, E/CRC, Oka and DNV (Njobuenwu et al, 2012;Dobrowolski et al, 2006;Zhang et al, 2014) are usually applied for predicting particle-induced erosion rate. Also, some models have also been proposed to predict droplet induced erosion rate (Khan and Wang, 2008;Isomoto and Miyata, 2008). However, there is significant disparity in prediction accuracy of these models.…”

Section: Introductionmentioning

confidence: 99%

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Verification of CFD Prediction Accuracy of Particle and Droplet Induced Erosion Rate for Engineering Applications

Kanamaru

2021

MATEC Web Conf.

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The solid particles or liquid droplets entrained by multi-phase flow in process plants can cause erosion resulting in pipe wall thinning. Hence, it is essential to evaluate erosion rate for determining design margin and taking counter-measures. Many models have been proposed for prediction of erosion induced by particles and droplets, but there is significant difference in their prediction accuracy. The present study aims at verifying prediction accuracy of some major erosion models using the published experimental data, for engineering applications. CFD benchmark simulations were conducted for different flow velocities and piping geometries to investigate prediction accuracy of particle-induced erosion rates for five major erosion models, using the experimental data in literature. CFD results show that the erosion rates predicted by Grant and Tabakoff model are closest to the experimental results with acceptable prediction accuracy for engineering applications. At the same time, CFD benchmark simulations were also carried out to verify the prediction accuracy of droplet induced erosion rates for three erosion models, using the published experimental data. CFD results show that the erosion rates predicted by Haugen model for all the water impingement velocities are closest to the experimental results with acceptable prediction accuracy for engineering applications.

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“…LDI is classified into two processes; one is dominated by the flow dynamics (physical and mechanical) process and the other is dominated by the corrosion (chemical) process. 3) Lots of empirical formula related to LDI have been reported mainly on erosion processes (hereinafter referred to as LDI (erosion)), 10,17,18) but only a few on corrosion processes (hereinafter referred to as LDI (corrosion)).…”

Section: Introductionmentioning

confidence: 99%

Evaluation Methods for Corrosion Damage of Components in Cooling Systems of Nuclear Power Plants by Coupling Analysis of Corrosion and Flow Dynamics (V) Flow-Accelerated Corrosion under Single- and Two-phase Flow Conditions

Okada

Uchida

Naitoh

et al. 2011

J. Nucl. Sci. Technol.

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The characteristics of flow-accelerated corrosion (FAC) in the wide sense are overviewed. Overlapping effects of flow dynamics and corrosion are important issues to determine the reliability and lifetime of major structures and components of light water reactor plants. FAC in single-and two-phase flows and liquid droplet impingement (LDI) in two-phase flow are typical phenomena due to both interactions. In order to evaluate local wall thinning due to FAC and LDI, a 6-step evaluation procedure for each has been proposed.(1) For FAC wall thinning evaluation, corrosive conditions along the flow path and mass transfer coefficients at the structure surface under single-and two-phase flow conditions were calculated to evaluate high-risk zones for FAC occurrence, and then wall thinning rates were calculated with the coupled model of static electrochemical analysis and dynamic oxide layer growth analysis at the identified high-FAC-risk zones.(2) For LDI local wall thinning evaluation, trajectories of liquid droplets in high-velocity steam, their collision densities and velocities on the pipe inner surface were calculated to evaluate high-risk zones for LDI occurrence, and then local wall thinning rates were calculated at the identified high-LDI-risk zones. For the region with steam velocity higher than 200 m/s, the wall thinning rate was determined mainly by erosion (LDI (erosion)), while for that with velocity lower than 100 m/s, it was determined by corrosion (LDI (corrosion)).(3) The FAC wall thinning model was applied for two-phase flow as well as single-phase flow, while the FAC wall thinning model was applied for LDI (corrosion). The empirical formula was applied for LDI (erosion) after discriminating LDI (corrosion) and LDI (erosion) based on steam velocity and quality.

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Erosion Phenomenon Caused by Water Droplet Impingement and Life Prediction of Industrial Materials: Part2-Establishment of predictive equations and evaluation of material performance

Cited by 17 publications

References 12 publications

Water Droplet Erosion Resistance of Aluminizing Diffusion Coatings on Steel Tubes

Water Droplet Erosion Resistance of Aluminizing Diffusion Coatings on Steel Tubes

Verification of CFD Prediction Accuracy of Particle and Droplet Induced Erosion Rate for Engineering Applications

Evaluation Methods for Corrosion Damage of Components in Cooling Systems of Nuclear Power Plants by Coupling Analysis of Corrosion and Flow Dynamics (V) Flow-Accelerated Corrosion under Single- and Two-phase Flow Conditions

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