Cavitation in impacted drops and jets and the effect on erosion damage thresholds

Field, J. E.; Camus, J.-J.; Tinguely, Marc; Obreschkow, Danail; Farhat, Mohamed

doi:10.1016/j.wear.2012.03.006

Cited by 83 publications

(60 citation statements)

References 20 publications

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“…For example, the estimated velocity values by continuity equation with a void fraction of 26% for the smallest nozzle outlet diameter d N = 1.8 mm are shown in figure 4. Although the gas bubbles are a limitation to the optical access of the near nozzle jet, the existence of those gas bubbles can be favourable in the rock destroying mechanism [18]. The here proven measurement techniques can be used to obtain a model for the energy impact on the rock surface.…”

Section: Estimation Of the Gas Proportion From Velocity Datamentioning

confidence: 99%

Visualisation and quantitative analysis of the near nozzle formation and structure of a high pressure water jet in air and water.

Jasper¹,

Hussong²,

Lindken³

2017

Proceedings ILASS–Europe 2017. 28th Conference on Liquid Atomization and Spray Systems

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High pressure water jets (HPWJ) with Reynolds numbers in the scale of 10 4 are visualised by high speed photography in air and water. Moreover, suitable measurement techniques are tested and verified by quantitative analysis of the emerging jet to identify the influence of the surrounding fluid on the HPWJ.The HPWJ process known from industrial applications can be adapted to the field of rock drilling. In this specific case, the HPWJ is used to cut and destroy rock in deep geothermal reservoirs. The process is known as jet drilling. Although there have been research activities in this field, the process itself is not well understood so far and practical applications are rare. Therefore, the aim of our work is the visualisation of the process to increase the knowledge of waterjet and rock interactions.High speed photography in terms of shadowgraph experiments is used for visualisation. Moreover, an estimation of the fluid velocity on the boundary of the HPWJ in air is performed. For this, the shadowgraph images are evaluated with the double-frame technique well known with particle image velocimetry (PIV). Analysis of both the structure and the velocity distribution of the HPWJ in water is done by combined PIV and laser induced fluorescence (LIF) analysis with fluorescent dye. Keywords PIV, LIF, velocity distribution, jet flow, spray analysis IntroductionThe use of geothermal energy for heat and power exploitation as a renewable energy resource can contribute to a more sustainable energy supply. Enhanced geothermal systems (EGS) enable the recovery of geothermal energy even in surroundings that do not have a naturally hydrothermal system [1,2]. Based on an injection well drilled into hard crystalline rock in up to 3000 m depth, several laterals are drilled into the rock formation to create an EGS.

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Section: Estimation Of the Gas Proportion From Velocity Datamentioning

confidence: 99%

Visualisation and quantitative analysis of the near nozzle formation and structure of a high pressure water jet in air and water.

Jasper¹,

Hussong²,

Lindken³

2017

Proceedings ILASS–Europe 2017. 28th Conference on Liquid Atomization and Spray Systems

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“…The vortex cavitation forms a big cavitation cloud, which shedding is a periodical phenomenon with a frequency in the order of several kHz (Soyama, et al (1994), Kwok, et al, (1997), Soyama, (2005) and Soyama, (2011)). When the cavitating jet hits the surface of a target material shock waves and micro jets are produced as the consequence of the bubble collapse, which cause a significant force of impact (≥1500MPa) (Karimi, Martin, (1986), and Field, et al, (2012)). For the applications where the erosive capabilities of the cavitating jets are utilized it is very important to have high energy impacts, and thus to produce erosive vortex cavitations with the highest possible efficiency (Yamaguchi, Shimizu (1987), Soyama (2004) and ).…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the influence of geometrical parameters on the cavitation erosion characteristics of high speed submerged jets

Hutli

Nedeljković

Bonyár

et al. 2017

Experimental Thermal and Fluid Science

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The influence of the geometrical working parameters on the cavitation erosion process was experimentally investigated by exposing the surfaces of copper samples (as a kind of Face Centred Cubic material (FCC)) to a high speed submerged cavitating jet for various time periods using a cavitating jet generator. The resulting erosion rate and eroded area is discussed in detail. Influences of the nondimensional standoff distance, the non-dimensional aspect ratio and the angle of attack is experimentally determined. The results show that the erosion rate and weight loss are strongly depending on these separately investigated parameters. With this test rig facility and applied hydrodynamic parameters the maximum erosion was found to take place with a non-dimensional standoff distance varying between 42-48 (depending on the nozzle diameter), with a non-dimensional aspect ratio of 11 and with 105° angle of attack. A model to explain the influence of the angle of attack on the erosion rate based on the cavity bubble and target surface interaction is presented. In addition, the obtained results demonstrate that the used small-diameter (0.4 -0.6 mm) water cutting nozzles could be applied for metal machining by cavitation and cavitation cutting with low power consumption and high cutting efficiency.

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“…The impingement of a cavitating jet leads to serious erosion in valves and hydraulic equipment. In order to reduce cavitation erosion in valves and oil hydraulic equipment or to improve the performance of jet cutting or under water cleaning etc., it is necessary to have an adequate knowledge about the mechanism of erosion due to the impingement of a cavitating jet (Choi (2012), Field et al (2012), , , Soyama et al (2009), and Yamaguchi and Shimizu (1987)). The great advantage of testing erosion by the use of cavitating jet is that the cavitating jet apparatus can simulate different cavitating conditions.…”

Section: Introductionmentioning

confidence: 99%

The relation between the high speed submerged cavitating jet behaviour and the cavitation erosion process

Hutli

Nedeljković

Radović

et al. 2016

International Journal of Multiphase Flow

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In order to accurately and reliably evaluate the cavitation erosion resistance of materials using a cavitating jet generator, the effects of the hydrodynamic parameters and the nozzle geometry on the erosion process were investigated. Since the behaviour of a high speed submerged cavitating jet is also depending on the working conditions; their influence is also discussed based on the evaluation of cavitation erosion process. The erosion rate was used as an indicator for cavitating jet behaviour. Specimens of commercial-purity copper were subjected to high speed submerged cavitating jets under different initial conditions, for certain time periods. The force generated by jet cavitation is employed to initiate the erosion in surface. The tested specimens were investigated with a digital optical microscope and a profilometer. It was found that erosion becomes more pronounced with decreasing cavitation numbers, as well as with increasing exit jet velocities. The nozzle configuration and hydrodynamic parameters have strong influences on the erosion rate, eroded area and depth of erosion. A comparison between the obtained results explains some of the mechanisms involved in cavitation and erosion processes and their relation to the tested parameters. Mathematical expressions which combine these parameters with the erosion rate are obtained. These parameters are very important in order to control the cavitation as a phenomenon and also to control the performance of the cavitating jet generator.

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Cavitation in impacted drops and jets and the effect on erosion damage thresholds

Cited by 83 publications

References 20 publications

Visualisation and quantitative analysis of the near nozzle formation and structure of a high pressure water jet in air and water.

Visualisation and quantitative analysis of the near nozzle formation and structure of a high pressure water jet in air and water.

Experimental study on the influence of geometrical parameters on the cavitation erosion characteristics of high speed submerged jets

The relation between the high speed submerged cavitating jet behaviour and the cavitation erosion process

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