Energy Dissipated during the Cavitation Bubble Collapse Close to a Solid Wall

Müller, Miloš; Zima, Patrik; Unger, Jiří

doi:10.3850/978-981-07-2826-7_259

Cited by 6 publications

(5 citation statements)

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“…The oscillatory second half corresponds to the bubble growth to the second maximum radius and the second collapse. Previous works [3], [4] have shown that the ratio between the magnitude of the first and second collapses depends on the type of collapse pattern (which will be discussed later). The peaks in the signal reveal the violent character of the collapses.…”

Section: Introductionmentioning

confidence: 82%

“…The signals are digitalized using the oscilloscopic card with the sampling frequency 60 MHz. The PVDF film is calibrated using the drop ball test described in [3], and the measured calibration constant is 7.48 mV/N. …”

Section: Methodsmentioning

confidence: 99%

“…Therefore, to achieve satisfactory temporal resolution of the collapse phenomena the resolution in the nanosecond range is required. In this study the bubble is generated by a low voltage discharge into crossing wires [3], [5]. This technique provides a simple way of producing spherical bubbles of different diameters.…”

Section: Introductionmentioning

confidence: 99%

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Identification of collapse patterns of cavitation bubbles close to a solid wall

Müller

Hujer

Kotek

et al. 2013

EPJ Web of Conferences

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Abstract.The article describes different patterns of bubble deformation during the cavitation bubble collapse close to a solid wall for different bubble-wall distances. The bubble is generated by energy discharge in water. The collapse patterns are investigated using high-speed photography. The magnitude of the bubble-wall interaction is measured using the PVDF film. The shock wave pressure in the far field is measured using the PVDF hydrophone.

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Section: Introductionmentioning

confidence: 82%

Section: Methodsmentioning

confidence: 99%

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Identification of collapse patterns of cavitation bubbles close to a solid wall

Müller

Hujer

Kotek

et al. 2013

EPJ Web of Conferences

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“…Numerical simulations of the impact velocity and impact pressure derive from the theory of the water hammer [ 4 , 20 , 21 ]. The impact pressure is determined by two basic equations.…”

Section: Methodsmentioning

confidence: 99%

Numerical Investigation of Degradation of 316L Steel Caused by Cavitation

Maurin

2021

Materials

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The degradation process of 316L stainless steel caused by cavitation was investigated by means of finite element analysis. The damage characteristics of metal specimens subjected to the cavitation bubble collapse process were recreated by simulation with a micro-jet water hammer. The simulation results were compared with the cavitation pits created in the experimental tests. In the experiment, different inlet and outlet pressures in a test chamber with a system of barricade exciters differentiated the erosion process results. Hydrodynamic cavitation caused uneven distribution of the erosion over the specimens’ surface, which has been validated by roughness measurements, enabling localisation and identification of the shape and topography of the impact pits. The erosion rate of the steel specimens was high at the beginning of the test and decreased over time, indicating the phase transformation and/or the strain-hardening of the surface layer. A numerical simulation showed that the impact of the water micro-jet with a velocity of 100 m/s exceeds the tensile strength of 316L steel, and produces an impact pit. The subsequent micro-jet impact on the same zone deepens the pit depth only to a certain extent due to elastoplastic surface hardening. The correlation between post-impact pit geometry and impact velocity was investigated.

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“…Alguns outros trabalhos interessantes mostrando colapso ou oscilações de bolhas podem, ainda, ser citados: Gilmore (1952), Keller e Kolodner (1956) e Prosperetti (1986), Muller et al (2012) e Bazanini e Bressan (2017), em que as simulações são validadas mediante medições do raio da bolha em função do tempo. A formação de bolhas para estudos experimentais pode ser realizada com equipamentos destinados ao ensaio experimental, tais como o equipamento a disco rotativo .…”

Section: Figuraunclassified

Crescimento e colapso de bolhas Comparação com o modelo de universo finito.

Bazanini¹,

Lima²,

Unfer³

2020

REVTEC

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No presente artigo são estudadas numericamente oscilações de bolhas excitadas por um campo externo variável de pressão. O modelo apresentado é mais completo que outros existentes por considerar a presença de ar mais vapor como gases reais dentro da bolha e as propriedades físicas dos fluidos participantes do processo tais como viscosidade, densidade, tensão superficial. Finalmente, o modelo utilizado é comparado ao modelo de universo finito fechado (atualmente em expansão) e eterno, visando obter eventuais conclusões sobre um possível futuro destinado ao mesmo, resultando em um universo finito eterno, concordando (senão embasando) com o modelo proposto pelo cientista brasileiro Mário Novello.

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Energy Dissipated during the Cavitation Bubble Collapse Close to a Solid Wall

Cited by 6 publications

References 0 publications

Identification of collapse patterns of cavitation bubbles close to a solid wall

Identification of collapse patterns of cavitation bubbles close to a solid wall

Numerical Investigation of Degradation of 316L Steel Caused by Cavitation

Crescimento e colapso de bolhas Comparação com o modelo de universo finito.

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