Experiments on liquid droplet impingement erosion by high-speed spray

Fujisawa, Nobuyuki; Yamagata, Takayuki; Hayashi, Kanto; Takano, Tsuyoshi

doi:10.1016/j.nucengdes.2012.06.022

Cited by 34 publications

(8 citation statements)

References 5 publications

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“…Sanchez [3] reported that the wear rate by droplet impingement is proportional to 4.0th power of V. In recent years, Hattori et al [4] measured the relationship between the erosion rate and flow velocity of included droplet in the experiment of water jet, so that the erosion rate is proportional to 4.5~6.5th power of the flow velocity. Fujisawa et al [5] showed that the erosion rate is proportional to 7th power of droplet impingement by experimental study with the high-speed conical spray-jet.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Damping Effect of Liquid Film on Material in High Speed Liquid Droplet Impingement

Sasaki

Ochiai

Iga

2016

International Journal of Fluid Machinery and Systems

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By high speed Liquid Droplet Impingement (LDI) on material, fluid systems are seriously damaged, therefore, it is important for the solution of the erosion problem of fluid systems to consider the effect of material in LDI. In this study, by using an in-house fluid/material two-way coupled method which considers reflection and transmission of pressure, stress and velocity on the fluid/material interface, high-speed LDI on wet/dry material surface is simulated. As a result, in the case of LDI on wet surface, maximum equivalent stress are less than those of dry surface due to damping effect of liquid film. Empirical formula of the damping effect function is formulated with the fluid factors of LDI, which are impingement velocity, droplet diameter and thickness of liquid film on material surface.

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Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Damping Effect of Liquid Film on Material in High Speed Liquid Droplet Impingement

Sasaki

Ochiai

Iga

2016

International Journal of Fluid Machinery and Systems

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“…Where, is erosion rate and (c) is a constant. The erosion rate can be evaluated from equation 1by using the experimental data of the droplet velocity V, the droplet diameter (d) and the number of impinging droplets [32]. The droplet velocity can be measured by particle image velocimetry, its diameter by shadowgraph technique and the number of impinging droplets in a unit area can be counted by a sampling probe [32,33,34].…”

Section: Liquid Erosion Parametersmentioning

confidence: 99%

“…It is proven that the maximum pressure on the solid surface due to the impingement of a droplet of diameter 100µm is damped down by 10% because of the presence of a liquid film with 2.5µm thickness over the solid material [55]. Furthermore, the erosion in the near field is higher than the erosion rate in the far field, which is due to the higher local flow rate in this area [32].…”

Section: Critical Parameters For Designmentioning

confidence: 99%

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Rain erosion-resistant coatings for wind turbine blades: A review

Dashtkar

Hadavinia

Şahinkaya

et al. 2019

Polymers and Polymer Composites

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Wind blades are the most expensive parts of wind turbines made from fibre-reinforced polymer composites. The blades play a critical role on the energy production, but they are prone to damage like any other composite components. Leading edge (LE) erosion of the wind turbine blades is one of the common damages, causing a reduction in the annual energy production especially in offshore wind turbine farms. This erosion can be caused by rain, sand and flying solid particles. Coating the blade against erosion using appropriate materials can drastically reduce these losses and hence is of great interest. The sol–gel technique is a convenient method to manufacture thin film coatings, which can protect the blades against the rain erosion, while having negligible effect on the weight of the blades. This article provides an extensive review of the liquid erosion mechanism, water erosion testing procedures and the contributing factors to the erosion of the LE of wind turbine blades. Techniques for improving the erosion resistance of the LE using carbon nanotubes and graphene nano-additives are also discussed.

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“…Furthermore, Fujisawa et al [40] conducted research on LIE experimentally by using high-speed spray for liquid droplets having a diameter in the range of some tens of micrometers. This size corresponds to the prototype pipeline condition of NPPs.…”

Section: Numerical Analysis Confirmed the Following Aspects Of Liementioning

confidence: 99%

Framework for Structural Online Health Monitoring of Aging and Degradation of Secondary Systems due to some Aspects of Erosion

Gribok¹,

Patnaik²,

Williams³

et al. 2016

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This report describes the current state of research related to critical aspects of erosion and selected aspects of degradation of secondary components in nuclear power plants (NPPs). The report also proposes a framework for online health monitoring of aging and degradation of secondary components. The framework consists of an integrated multi-sensor modality system, which can be used to monitor different piping configurations under different degradation conditions. The report analyses the currently known degradation mechanisms and available predictive models. Based on this analysis, the structural health monitoring framework is proposed. The Light Water Reactor Sustainability Program began to evaluate technologies that could be used to perform online monitoring of piping and other secondary system structural components in commercial NPPs. These online monitoring systems have the potential to identify when a more-detailed inspection is needed using real-time measurements, rather than at a predetermined inspection interval. This transition to condition-based, risk-informed automated maintenance will contribute to a significant reduction of operations and maintenance costs that account for the majority of nuclear power generation costs. There is unanimous agreement between industry experts and academic researchers that identifying and prioritizing inspection locations in secondary piping systems (for example, in raw water piping or diesel piping) would eliminate many excessive in-service inspections. The proposed structural health monitoring framework takes aim at answering this challenge by combining long-range guided wave technologies with other monitoring techniques, which can significantly increase the inspection length and pinpoint the locations that degraded the most. More widely, the report suggests research efforts aimed at developing, validating, and deploying online corrosion monitoring techniques for complex geometries, which are pervasive in NPPs.

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Experiments on liquid droplet impingement erosion by high-speed spray

Cited by 34 publications

References 5 publications

Numerical Analysis of Damping Effect of Liquid Film on Material in High Speed Liquid Droplet Impingement

Numerical Analysis of Damping Effect of Liquid Film on Material in High Speed Liquid Droplet Impingement

Rain erosion-resistant coatings for wind turbine blades: A review

Framework for Structural Online Health Monitoring of Aging and Degradation of Secondary Systems due to some Aspects of Erosion

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