A study of cavitation bubble collapse pressures and erosion part 3: the results in a venturi facility

Iwai, Yoshiro; Okada, Tsunenori; Mori, Hiroyuki

doi:10.1016/0043-1648(91)90330-w

Cited by 4 publications

(1 citation statement)

References 7 publications

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“…The failure of components due to cavitation erosion has been a significant problem in many hydraulic machines, including the marine propellers and impellers [1]. Generally the cavitation damage is known to be produced by the cumulative impulsive pressure generated by cavitation bubble collapse, and so it is considered to be surface fatigue [2][3][4][5]. However, the relationship between the collapsing pressure of a cavitation bubble and the process of surface fracture, that is, how large the pressures are at collapse and how they act on the surface and result in the fracture, have remained unclear [6,7].…”

Section: Introductionmentioning

confidence: 99%

Analysis on Fatigue Fracture of the Flame-Quenched 8.8Al-Bronze by Ultrasonic Vibratory Cavitation Erosion

Hong

Lee

Kim

et al. 2006

SSP

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In this study the fatigue properties due to cavitation damage of flame-quenched 8.8Al-bronze (8.8Al-4.5Ni-4.5Fe-Cu) as well as current nuclear pump materials (8.8Al-bronze, SUS316 and SR50A) have been investigated by using an ultrasonic vibratory cavitation test. For this the impact loads of cavitation bubbles generated by ultrasonic vibratory device quantitatively evaluated and simultaneously the cavitation erosion experiments have been carried out. The fatigue analysis on the cavitation damage of the materials has been made from the determined impact load distribution (e.g. impact load, bubble count) and erosion parameters (e.g. incubation period, MDPR). According to Miner’s law, the exponents b of the F-N relation (Fb N = Constant) at the incubation stage (N: the number of fracture cycle) were 5.62, 4.16, 6.25 and 8.1 for the 8.8Al-bronze, flame-quenched sample, SUS316 and SR50A alloys, respectively. At steady-state, the exponents b of the F-N curve (N: the number of cycles required for a 1μm increment of MDP) were determined as 6.32, 5, 7.14 and 7.76 for the 8.8Al-bronze, flame-quenched sample, SUS316 and SR50A alloys, respectively.

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Section: Introductionmentioning

confidence: 99%

Analysis on Fatigue Fracture of the Flame-Quenched 8.8Al-Bronze by Ultrasonic Vibratory Cavitation Erosion

Hong

Lee

Kim

et al. 2006

SSP

View full text Add to dashboard Cite

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3D flow simulations and pressure measurements for the evaluation of cavitation dynamics and flow aggressiveness in ultrasonic erosion devices with varying gap widths

Schreiner

Paepenmöller

Skoda

2020

Ultrasonics Sonochemistry

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Beamed UV sonoluminescence by aspherical air bubble collapse near liquid-metal microparticles

Boyd

Suslov

Becker

et al. 2020

Sci Rep

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Irradiation with UV-C band ultraviolet light is one of the most commonly used ways of disinfecting water contaminated by pathogens such as bacteria and viruses. Sonoluminescence, the emission of light from acoustically-induced collapse of air bubbles in water, is an efficient means of generating UV-C light. However, because a spherical bubble collapsing in the bulk of water creates isotropic radiation, the generated UV-C light fluence is insufficient for disinfection. Here, we show that we can create a UV light beam from aspherical air bubble collapse near a gallium-based liquid-metal microparticle. The beam is perpendicular to the metal surface and is caused by the interaction of sonoluminescence light with UV plasmon modes of the metal. We calculate that such beams can generate fluences exceeding 10 mJ/cm 2 , which is sufficient to irreversibly inactivate most common pathogens in water with the turbidity of more than 5 Nephelometric Turbidity Units.Introduction.-The ability of UV-C light (200 − 280 nm) to inactivate bacteria, viruses and protozoa is widely used as an environmentally-friendly, chemical-free and highly effective means of disinfecting and safeguarding water against pathogens responsible for cholera, polio, typhoid, hepatitis and other bacterial, viral and parasitic diseases 1 . UV-C light inactivates pathogens through absorption of radiation energy by their cellular RNA and DNA prompting the formation of new bonds between adjacent nucleotides. This results in a photochemical damage that renders pathogens incapable of reproducing and infecting 1 .However, some pathogens can recover from photochemical damage when the initial UV dosage (fluence) is not sufficiently high 1 . Thus, the fluence must exceed 5 and 10 mJ/cm 2 , respectively, to inactivate 99% and 99.9% of Giardia and Cryptosporidium pathogens 2 . These specifications are for water purified from solid particles larger than 5 − 10 µm [turbidity less than 5 Nephelometric Turbidity Units (NTU)] 2 . Otherwise, particles can shield pathogens from the UV light, thereby allowing many pathogens to recover and infect.The filtration of natural water presents significant challenges for remote communities and developing nations 2 . Moreover, filtered water, dissolved iron, organic salts and the pathogen population itself absorb UV-C light. Therefore, a 50% UV radiation loss has been accepted as suitable for practical use 1 .To enable UV disinfection of turbid water, we use the effect of sonoluminescence-the emission of broadband UV light in acoustically-induced collapse of air bubbles in water 3,4 . Air bubbles suitable for sonoluminescence can be created in natural water 5 and we show that they can act as compact sources of germicidal radiation lo-

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A study of cavitation bubble collapse pressures and erosion part 3: the results in a venturi facility

Cited by 4 publications

References 7 publications

Analysis on Fatigue Fracture of the Flame-Quenched 8.8Al-Bronze by Ultrasonic Vibratory Cavitation Erosion

Analysis on Fatigue Fracture of the Flame-Quenched 8.8Al-Bronze by Ultrasonic Vibratory Cavitation Erosion

3D flow simulations and pressure measurements for the evaluation of cavitation dynamics and flow aggressiveness in ultrasonic erosion devices with varying gap widths

Beamed UV sonoluminescence by aspherical air bubble collapse near liquid-metal microparticles

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