Erosion Due to Impingement of Cavitating Jet

Yamaguchi, Atsushi; Shimizu, Seiji

doi:10.1115/1.3242686

Cited by 68 publications

(29 citation statements)

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“…However, the greatest advantage is the fact that the flow parameters can be controlled independently. The behaviour of severely erosive cavitation depends on pressure gradient in the jet nozzle, jet geometry, and material of the subject [12,14,20,21,24,31,35]. As the cavitation bubbles collapse on the surface of a specimen, the surface will become increasingly eroded.…”

Section: Introductionmentioning

confidence: 99%

Mechanics of submerged jet cavitating action: material properties, exposure time and temperature effects on erosion

2007

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Experimental setup with a submerged cavitating jet has been used for the study of influences of material, exposure time and working fluid temperature on the erosion process. Each of the parameters has been varied separately, and the results of erosion are analyzed in detail. Additionally, comparison of experiments with nitrated and non-nitrated material has been made in order to study the enhancement (mostly reflected as the prolonged incubation time) of erosion resistance achieved by nitrating the specimen surface. List of symbols σ cavitation number-defined as σ = p ref − p v 1 2 ρ×u 2 ref p ref reference (downstream) pressure (bar) p v (T ) saturation (vapour) pressure (bar) ρ L (T ) density of the liquid (kg/m 3 ) T temperature ( • C) L stand-off distance (mm) A nozzle outlet cross-section area (m 2 ) D in inlet nozzle diameter (mm) u ref reference velocity − exit jet velocity (m/s) = Q/A = V j p 1 upstream pressure (bar) (absolute) p 2 downstream pressure (bar) (absolute) W weight loss (mg), ρ m density of the eroding material (kg/m 3 ), t exposure time (h, s) Q K× √ ( p 1 − p 2 ) flow rate (m 3 /s) K constant = 4.78E-09 for divergent; (m 3 /s/Pa 1/2 ) = 6.17E-09 for convergent nozzle D out outlet nozzle diameter (mm)

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Section: Introductionmentioning

confidence: 99%

Mechanics of submerged jet cavitating action: material properties, exposure time and temperature effects on erosion

2007

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“…Therefore an exact solution by either analytical or experimental methods has been out of reach for a long time (Minguan, et al, (2013)). If the relation between the cavitation intensity in a cavitating jet and the erosion rate of materials would be investigated precisely, the key parameter for the prediction of the cavitation erosion rate may be clarified (Yamaguchi, Shimizu (1987), Yamaguchi, Kazama, (2000), and Soyama, et al, (2012)). From the erosion point of view, the behaviour of the severely erosive cavitation depends on the pressure gradient in the jet nozzle, the jet geometry and the material of the target (Soyama, (2011), Yamaguchi, Shimizu (1987), Li, Kang (2016) and Yamaguchi, Kazama (2000)).…”

Section: Introductionmentioning

confidence: 99%

“…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 ). Maximizing the efficiency of cavitating jets is not trivial since many parameters have an influence on the erosion process, such as: hydrodynamic conditions, geometrical conditions (nozzle, test chamber and the target), fluid and material properties (Kwok, et al, (1997), Soyama (2011), Yamaguchi, Shimizu (1987), Li, Kang (2016), Soyama, Asahara (1999), Dular (2015)).…”

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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Erosion Due to Impingement of Cavitating Jet

Abstract: Cavitation erosion produced by impingent of cavitating jet was experimentally studied with specimens of aluminum alloy in high water base fluid of chemical solution type and tap water. Furthermore, the behavior of impinging cavity clouds was observed through instantaneous photographs.

Cited by 68 publications

References 0 publications

Mechanics of submerged jet cavitating action: material properties, exposure time and temperature effects on erosion

Mechanics of submerged jet cavitating action: material properties, exposure time and temperature effects on erosion

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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