Numerical analysis of cavitation cloud shedding in a submerged water jet

Peng, Guoyi; Yang, Congxin; Oguma, Yasuyuki; Shimizu, Seiji

doi:10.1016/s1001-6058(16)60700-x

Cited by 37 publications

(5 citation statements)

References 16 publications

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“…The bubbles collapse above the sample, generating shock waves and micro jet, which shock the foil. 20,21 Only a few bubbles appear and cause little impact on the material in the periphery-impact-zone. There was no strict boundary between the three regions.…”

Section: Resultsmentioning

confidence: 99%

Water-jet cavitation shocking as a novel array micro-forming technique

Chen

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part B:

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Micro-feature arrays and large-area complex microscopic features on thin metallic sheet play an important role in micro-components. A novel technique-submerged water-jet cavitation shocking-is presented to generate micro-feature arrays on 304 stainless foils in this paper. High-speed camera shadowgraph images of the cavitation cloud were employed to analyze the impact zone. Then the forming depth, uniformity of forming depth and the thickness distribution of the micro-feature arrays were also studied. The results show that the forming region can be categorized into the jet-impact-zone, the bubble-impact-zone and the periphery-impact-zone radially. Bubble-impact-zone peaks in the depth of array micro-forming. The forming depth increases with time while the uniformity decreases with time. The forming parts have a uniform thickness distribution.

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Section: Resultsmentioning

confidence: 99%

Water-jet cavitation shocking as a novel array micro-forming technique

Chen

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part B:

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“…Therefore, the annular band is the strongest under the impact of cavitation collapse. Although a few vacuoles are outside the cavitation impact zone, it diffuses outwards with the jet ow, and its effect on the material is limited [18,19].…”

Section: Experimental Principlementioning

confidence: 99%

Feasibility study on the micro-forming of novel metal foil arrays based on submerged cavitating water-jet impingement

Yan²,

Zhang³

et al. 2022

Preprint

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To solve the problems of high cost and complex technology in the current plastic forming method of metal foil, a micro-forming method of submerged cavitation water-jet metal foil array with cavitation collapse shock wave loading is presented in this paper, which has advantages of high efficiency, flexibility, low cost and environmental protection. 304 stainless steel foil array micro-pore formation was taken as an example in this paper. The mixing nozzle was designed and three regions where the cavitation water-jet acts on were analysed. The influence law of target distance, impact time on the forming depth and uniformity of metal foil array was examined and the optimal position of array micro-forming in the impact zone of vacuoles collapse was revealed. Results indicate that the depth and uniformity of array micro-pores in the impact zone of cavitation collapse increases with time. However, with the increase of the target distance, it will increase first and then decrease; the depth of the array micro-pores on the radius r=13.6 mm can reach 166.4 μm, and the variance is only 5.9 μm under the condition of impact time of 5 min, target distance of 120 mm and pressure of 20 MPa; the maximum surface roughness is 1.54 μm and the thinning rate is between 2% and 10%.

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“…However, the calculation of these equations is time consuming for the high frequency of bubble oscillation. For simplifying the numerical calculation, the cavitation bubbles are treated as quasi-still one in this work and an estimation of bubble radius is estimated by solving a simplified Rayleigh-Plesset equation [6].…”

Section: Compressible Mixture Flow Bubble-cavitation Modelmentioning

confidence: 99%

Numerical Simulation of Unsteady Cavitation in a Submerged Water Jet by Compressible Bubbly Mixture Flow Method

Peng¹,

Oguma²

2018

Proceedings of the 10th International Symposium on Cavitation (CAV2018)

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Focused on the unsteady behavior of high-speed water jets with intensive cavitation a numerical analysis is performed by applying a compressible mixture-flow bubble-cavitation model. The mean flow of two-phase mixture is calculated by URANS for compressible flow and the intensity of cavitation in a local field is evaluated by the volume fraction of gas phase varying with the expansion and contraction of bubbles. High-speed submerged water jet issuing from a sheathed nozzle is treated when  and Re   The distribution of cavitation clouds predicted approximately agrees with experiment data of visualization observation and the unsteady behavior of cavitation cloud shedding is captured acceptably. Computational results reveal that cavitation occurs at the entrance of nozzle throat and bubble clouds develop and flow downstream along the boundary layer. Developed bubble clouds split into small blocks and shed downstream periodically near the exit of sheath.

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Numerical analysis of cavitation cloud shedding in a submerged water jet

Cited by 37 publications

References 16 publications

Water-jet cavitation shocking as a novel array micro-forming technique

Water-jet cavitation shocking as a novel array micro-forming technique

Feasibility study on the micro-forming of novel metal foil arrays based on submerged cavitating water-jet impingement

Numerical Simulation of Unsteady Cavitation in a Submerged Water Jet by Compressible Bubbly Mixture Flow Method

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