Cone-like bubble formation in ultrasonic cavitation field

Moussatov, Alexei; Granger, C.; Dubus, Bertrand

doi:10.1016/s1350-4177(02)00152-9

Cited by 146 publications

(83 citation statements)

References 1 publication

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“…The radial horn produces an intense SCL field close to the vibrating face at the lower pH (Figure 8(a)) whilst an intense luminescence field over the entire area is produced at the higher pH (Figure 8(c)). The probe device produces a cone shaped field of luminescence at pH 12 ( Figure 8(d)), similar to that described by other researchers [11,24], but exhibits no luminescence at the lower pH 9.5 (Figure 8(c)). The cone shaped field can be more clearly seen in Figure 9 which is the same image as Figure 8(d) but with the colour levels adjusted.…”

Section: Cavitation Field Visualisationsupporting

confidence: 84%

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A radial mode ultrasonic horn for the inactivation of Escherichia coli K12

Hunter

Lucas

Watson

et al. 2008

Ultrasonics Sonochemistry

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Tuned cylindrical radial mode ultrasonic horns offer advantages over ultrasonic probes in the design of flow-through devices for bacterial inactivation. This study presents a comparison of the effectiveness of a radial horn and probe in the inactivation of E. coli K12. The radial horn is designed using finite element analysis and the predicted modal parameters are validated using experimental modal analysis. A validated finite element model of the probe is also presented. Visual studies of the cavitation fields produced by the radial horn and probe are carried out using luminol and also backlighting to demonstrate the advantages of radial horns in producing a more focused cavitation field with widely dispersed streamers. Microbiological studies show that, for the same power density, better inactivation of E. coli K12 is achieved using the radial horn and, also, the radial horn offers greater achievable power density resulting in further improvements in bacterial inactivation. The radial horn is shown to be more effective than the probe device and offers opportunities to design in-line flow-through devices for processing applications.

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Section: Cavitation Field Visualisationsupporting

confidence: 84%

“…It is known that cavitation can cause sonochemiluminescence (SCL) through chemical reactions involving luminol (3-aminophthalhydrazide, 97%) and hydrogen peroxide (H 2 O 2 ) [23,24]. The cavitational collapse of bubbles causes the release of HO · free radicals which react with the luminol solution.…”

Section: Cavitation Field Visualisationmentioning

confidence: 99%

A radial mode ultrasonic horn for the inactivation of Escherichia coli K12

Hunter

Lucas

Watson

et al. 2008

Ultrasonics Sonochemistry

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“…A detailed description of this grading of erosion damage can be found elsewhere. [42] The intensity of cavitation is accumulated in the centre of the sample, as clearly indicated by the direction of the acoustic stream in Figure 5(a), (a full account of the cavitation high-speed monitoring process can be found in Reference 18) and also explained by Moussatov et al [43] by the conicity of the acoustic stream where streamlines tend to focus in a centre point. Therefore, the damage in that particular area occurs continuously.…”

Section: B Simulated Erosionmentioning

confidence: 81%

Evaluation of Cavitation Erosion Behavior of Commercial Steel Grades Used in the Design of Fluid Machinery

Tzanakis

Bolzoni

Eskin

et al. 2017

Metall Mater Trans A

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The erosion response under cavitation of different steel grades was assessed by studying the erosion rate, the volume removal, the roughness evolution, and the accumulated strain energy. A 20 kHz ultrasonic transducer with a probe diameter of 5 mm and peak-to-peak amplitude of 50 lm was deployed in distilled water to induce damage on the surface of commercial chromium and carbon steel samples. After a relatively short incubation period, cavitation induced the formation of pits, cracks, and craters whose features strongly depended on the hardness and composition of the tested steel. AISI 52100 chromium steel showed the best performance and is, therefore, a promising design candidate for replacing the existing fluid machinery materials that operate within potential cavitating environments.

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“…26 In addition, cavitation bubbles generated by the high-intensity ultrasound would pyrolyse water molecules that formed a number of free hydroxyl radicals (OH). 27 Based on these, the reaction between triglycerides and sodium hydroxide was promoted by high-intensity ultrasound, and subsequently a decrease of AVs was observed in the samples after ultrasonic processing.…”

Section: Analysis Of Raw Oils and Oil Phasementioning

confidence: 93%

Effects of high-intensity ultrasound and oil type on the Maillard reaction of d-glucose and glycine in oil-in-water systems

Seow²,

Ong

et al. 2018

npj Sci Food

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This study addresses the effect of high-intensity ultrasonic processing on four oil-in-water systems, using sunflower, peanut, olive and flaxseed oils, respectively, that contained an aqueous D-glucose and glycine Maillard reaction (MR) model system. The MR in the water phase was promoted as observed from higher depletion of reactants and higher amount of MR products (MRPs). A significantly higher amount of pyrazines was generated after ultrasonic processing, particularly in the sunflower and olive oil systems. These promotions were attributed to a well-mixing effect and a localised high temperature and pressure environment generated by the high-intensity ultrasound. However, upon 1 h of ultrasonic processing at 80°C, a significant increase of oxidation was observed with high peroxide and p-anisidine values in the post-processed oils; meanwhile, the amount of unsaturated fatty acids decreased as well. As a result, some off-flavours were also detected in the post-processed oils, which affected the overall flavour profile of the MR systems.

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Cone-like bubble formation in ultrasonic cavitation field

Cited by 146 publications

References 1 publication

A radial mode ultrasonic horn for the inactivation of Escherichia coli K12

A radial mode ultrasonic horn for the inactivation of Escherichia coli K12

Evaluation of Cavitation Erosion Behavior of Commercial Steel Grades Used in the Design of Fluid Machinery

Effects of high-intensity ultrasound and oil type on the Maillard reaction of d-glucose and glycine in oil-in-water systems

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