Dynamics of Attached Cavitation at an Ultrasonic Horn Tip

Dular, MatevŪ; Mettin, Robert; Žnidarčič, Anton; Truong, Viet Anh

doi:10.3850/978-981-07-2826-7_068

Cited by 2 publications

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“…Dular et al [4] and Mettin et al [9] have shown in their experimental analysis that expansion and collapse of vapour structures take place on subharmonic time scales with respect to the driving frequency [4]. For testcases without counter sample the subharmonic emission falls into the range of 1/7 to 1/5 of the driving frequency [24].…”

Section: Subharmonic Oscillationsmentioning

confidence: 99%

“…Cavitation expansion is calculated immensely faster and the maximum amount of vapour achieved is much lower than in experimental measurements. They concluded that these cavitation models are not appropriate for the simulation of ultrasonic cavitation and further modifications of present cavitation models are needed [4].…”

Section: Introductionmentioning

confidence: 99%

“…Simulation results show a good agreement with measurement data for the location of cavitation erosion damage. Dular et al [4] and Mettin et al [9] have analysed ultrasonic cavitation at an ultrasonic horn tip by using of different VoF-Models (SchnerrSauer [14], Zwart-Gerber-Belamri [26], Singhal [19]). In spite of systematic parameter variation for cavitation model parameters they cannot capture the subharmonic cavitation oscillation frequencies.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of the cavitating flow induced by an ultrasonic horn – Numerical 3D simulation for the analysis of vapour structures and the assessment of erosion-sensitive areas

Mottyll

Müller

Niederhofer

et al. 2014

EPJ Web of Conferences

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This paper reports the outcome of a numerical study of ultrasonic cavitation using a CFD flow algorithm based on a compressible density-based finite volume method with a low-Machnumber consistent flux function and an explicit time integration [15; 18] in combination with an erosion-detecting flow analysis procedure. The model is validated against erosion data of an ultrasonic horn for different gap widths between the horn tip and a counter sample which has been intensively investigated in previous material studies at the Ruhr University Bochum [23] as well as on first optical in-house flow measurement data which is presented in a companion paper [13]. Flow features such as subharmonic cavitation oscillation frequencies as well as constricted vapour cloud structures can also be observed by the vapour regions predicted in our simulation as well as by the detected collapse event field (collapse detector) [12]. With a statistical analysis of transient wall loads we can determine the erosion sensitive areas qualitatively. Our simulation method can reproduce the influence of the gap width on vapour structure and on location of cavitation erosion. Nomenclature

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Section: Subharmonic Oscillationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Analysis of the cavitating flow induced by an ultrasonic horn – Numerical 3D simulation for the analysis of vapour structures and the assessment of erosion-sensitive areas

Mottyll

Müller

Niederhofer

et al. 2014

EPJ Web of Conferences

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Effects of Increasing Acoustic Power at a Small-Diameter Ultrasonic Horn Tip on the Synthesis and Characteristics of MnO2 Nanoparticles

Hajnorouzi

Rahmanifar

Yaghoubi

2020

J. Korean Phys. Soc.

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In this research, we measured the chemical and the physical parameters of increasing ultrasonic power amplitude at a small-diameter ultrasonic horn tip in a volume of 50 ml. This work was done using KI dosimeter, a calorimetric method, electrical power measurements, and photographs of the bubble cloud. Then, the effects of increasing ultrasonic amplitude on the synthesis and the characteristics of MnO2 nanoparticles was studied. The different MnO2 nanoparticles were characterized by using UV-Vis spectroscopy, powder X-ray diffraction (XRD), and field-emission scaning electron microscopy (FESEM). The results showed that when the acoustic power was increased, the crystallite size and the adhesion between nanoparticles increased. However, the synthesis rate of the nanoparticles was not significantly increased. The comparability of the measured data is discussed by considering cavitation dynamics, bubble collapse, high-pressure shock waves, and cavitation shielding.

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Dynamics of Attached Cavitation at an Ultrasonic Horn Tip

Cited by 2 publications

References 0 publications

Analysis of the cavitating flow induced by an ultrasonic horn – Numerical 3D simulation for the analysis of vapour structures and the assessment of erosion-sensitive areas

Analysis of the cavitating flow induced by an ultrasonic horn – Numerical 3D simulation for the analysis of vapour structures and the assessment of erosion-sensitive areas

Effects of Increasing Acoustic Power at a Small-Diameter Ultrasonic Horn Tip on the Synthesis and Characteristics of MnO2 Nanoparticles

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