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Journal articles on the topic 'Collapse of cavitation bubbles'

Author: Grafiati

Published: 4 June 2021

Last updated: 10 February 2022

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1

Luo, Jing, Weilin Xu, Jun Deng, Yanwei Zhai, and Qi Zhang. "Experimental Study on the Impact Characteristics of Cavitation Bubble Collapse on a Wall." Water 10, no. 9 (2018): 1262. http://dx.doi.org/10.3390/w10091262.

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As a hydrodynamic phenomenon, cavitation is a main concern in many industries such as water conservancy, the chemical industry and medical care. There are many studies on the generation, development and collapse of cavitation bubbles, but there are few studies on the variation of the cyclic impact strength on walls from the collapse of cavitation bubbles. In this paper, a high-speed dynamic acquisition and analysis system and a pressure measuring system are combined to study the impact of a cavitation bubble generated near a wall for various distances between the cavitation bubble and the wall

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2

WILSON, MILES, JOHN R. BLAKE, and PETER M. HAESE. "CLOUD CAVITATION DYNAMICS." ANZIAM Journal 50, no. 2 (2008): 199–208. http://dx.doi.org/10.1017/s1446181109000133.

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AbstractAn analysis is developed for the behaviour of a cloud of cavitation bubbles during both the growth and collapse phases. The theory is based on a multipole method exploiting a modified variational principle developed by Miles [“Nonlinear surface waves in closed basins”, J. Fluid Mech.75 (1976) 418–448] for water waves. Calculations record that bubbles grow approximately spherically, but that a staggered collapse ensues, with the outermost bubbles in the cloud collapsing first of all, leading to a cascade of bubble collapses with very high pressures developed near the cloud centroid. A m

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3

Liu, Yang, and Yong Peng. "Study on the Collapse Process of Cavitation Bubbles Near the Concave Wall by Lattice Boltzmann Method Pseudo-Potential Model." Energies 13, no. 17 (2020): 4398. http://dx.doi.org/10.3390/en13174398.

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In this paper, the lattice Boltzmann pseudo-potential model coupled the Carnahan–Starling (C-S) equation of state and Li’s force scheme are used to study the collapse process of cavitation bubbles near the concave wall. It mainly includes the collapse process of the single and double cavitation bubbles in the near-wall region. Studies have shown that the collapse velocity of a single cavitation bubble becomes slower as the additional pressure reduces, and the velocity of the micro-jet also decreases accordingly. Moreover, the second collapse of the cavitation bubble cannot be found if the addi

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4

CHOI, JAEHYUG, and STEVEN L. CECCIO. "Dynamics and noise emission of vortex cavitation bubbles." Journal of Fluid Mechanics 575 (March 2007): 1–26. http://dx.doi.org/10.1017/s0022112006003776.

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The growth and collapse of a cavitation bubble forming within the core of a line vortex was examined experimentally to determine how the dynamics and noise emission of the elongated cavitation bubble is influenced by the underlying non-cavitating vortex properties. A steady line vortex was formed downstream of a hydrofoil mounted in the test section of a recirculating water channel. A focused pulse of laser light was used to initiate a nucleus in the core of a vortex, allowing for the detailed examination of the growth, splitting and collapse of individual cavitation bubbles as they experience

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5

CHOI, JAEHYUG, CHAO-TSUNG HSIAO, GEORGES CHAHINE, and STEVEN CECCIO. "Growth, oscillation and collapse of vortex cavitation bubbles." Journal of Fluid Mechanics 624 (April 10, 2009): 255–79. http://dx.doi.org/10.1017/s0022112008005430.

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The growth, oscillation and collapse of vortex cavitation bubbles are examined using both two- and three-dimensional numerical models. As the bubble changes volume within the core of the vortex, the vorticity distribution of the surrounding flow is modified, which then changes the pressures at the bubble interface. This interaction can be complex. In the case of cylindrical cavitation bubbles, the bubble radius will oscillate as the bubble grows or collapses. The period of this oscillation is of the order of the vortex time scale, τV = 2πrc/uθ, max, where rc is the vortex core radius and uθ, m

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6

PHILIPP, A., and W. LAUTERBORN. "Cavitation erosion by single laser-produced bubbles." Journal of Fluid Mechanics 361 (April 25, 1998): 75–116. http://dx.doi.org/10.1017/s0022112098008738.

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In order to elucidate the mechanism of cavitation erosion, the dynamics of a single laser-generated cavitation bubble in water and the resulting surface damage on a flat metal specimen are investigated in detail. The characteristic effects of bubble dynamics, in particular the formation of a high-speed liquid jet and the emission of shock waves at the moment of collapse are recorded with high-speed photography with framing rates of up to one million frames/s. Damage is observed when the bubble is generated at a distance less than twice its maximum radius from a solid boundary (γ=2, where γ=s/R

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7

Lu, Tianshi, Roman Samulyak, and James Glimm. "Direct Numerical Simulation of Bubbly Flows and Application to Cavitation Mitigation." Journal of Fluids Engineering 129, no. 5 (2006): 595–604. http://dx.doi.org/10.1115/1.2720477.

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The direct numerical simulation (DNS) method has been used to the study of the linear and shock wave propagation in bubbly fluids and the estimation of the efficiency of the cavitation mitigation in the container of the Spallation Neutron Source liquid mercury target. The DNS method for bubbly flows is based on the front tracking technique developed for free surface flows. Our front tracking hydrodynamic simulation code FronTier is capable of tracking and resolving topological changes of a large number of interfaces in two- and three-dimensional spaces. Both the bubbles and the fluid are compr

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8

DELALE, C. F., G. H. SCHNERR, and J. SAUER. "Quasi-one-dimensional steady-state cavitating nozzle flows." Journal of Fluid Mechanics 427 (January 25, 2001): 167–204. http://dx.doi.org/10.1017/s0022112000002330.

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Quasi-one-dimensional cavitating nozzle flows are considered by employing a homogeneous bubbly liquid flow model. The nonlinear dynamics of cavitating bubbles is described by a modified Rayleigh–Plesset equation that takes into account bubble/bubble interactions by a local homogeneous mean-field theory and the various damping mechanisms by a damping coefficient, lumping them together in the form of viscous dissipation. The resulting system of quasi-one-dimensional cavitating nozzle flow equations is then uncoupled leading to a nonlinear third-order ordinary differential equation for the flow s

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9

Mao, Yunfei, Yong Peng, and Jianmin Zhang. "Study of Cavitation Bubble Collapse near a Wall by the Modified Lattice Boltzmann Method." Water 10, no. 10 (2018): 1439. http://dx.doi.org/10.3390/w10101439.

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In this paper, an improved lattice Boltzmann Shan‒Chen model coupled with Carnahan-Starling equation of state (C-S EOS) and the exact differential method (EDM) force scheme is used to simulate the cavitation bubble collapse in the near-wall region. First, the collapse of a single cavitation bubble in the near-wall region was simulated; the results were in good agreement with the physical experiment and the stability of the model was verified. Then the simulated model was used to simulate the collapse of two cavitation bubbles in the near-wall region. The main connection between the two cavitat

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10

Wang, Yi-Chun, and Christopher E. Brennen. "Numerical Computation of Shock Waves in a Spherical Cloud of Cavitation Bubbles." Journal of Fluids Engineering 121, no. 4 (1999): 872–80. http://dx.doi.org/10.1115/1.2823549.

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The nonlinear dynamics of a spherical cloud of cavitation bubbles have been simulated numerically in order to learn more about the physical phenomena occurring in cloud cavitation. A finite cloud of nuclei is subject to a decrease in the ambient pressure which causes the cloud to cavitate. A subsequent pressure recovery then causes the cloud to collapse. This is typical of the transient behavior exhibited by a bubble cloud as it passes a body or the blade of a ship propeller. The simulations employ the fully nonlinear continuum bubbly mixture equations coupled with the Rayleigh-Plesset equatio

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11

BRENNER, MICHAEL P. "Cavitation in linear bubbles." Journal of Fluid Mechanics 632 (July 27, 2009): 1–4. http://dx.doi.org/10.1017/s0022112009008167.

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Recent work has developed a beautiful model system for studying the energy focusing and heating power of collapsing bubbles. The bubble is effectively one-dimensional and the collapse and heating can be quantitatively measured. Thermal effects are shown to play an essential role in the time-dependent dynamics.

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12

Ceccio, S. L., and C. E. Brennen. "Observations of the dynamics and acoustics of travelling bubble cavitation." Journal of Fluid Mechanics 233 (December 1991): 633–60. http://dx.doi.org/10.1017/s0022112091000630.

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Individual travelling cavitation bubbles generated on two axisymmetric headforms were detected using a surface electrode probe. The growth and collapse of the bubbles were studied photographically, and these observations are related to the pressure fields and viscous flow patterns associated with each headform. Measurements of the acoustic impulse generated by the bubble collapse are analysed and found to correlate with the maximum volume of the bubble for each headform. These results are compared to the observed bubble dynamics and numerical solutions of the Rayleigh–Plesset equation. Finally

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13

Soyama, H. "Corrosion Behavior of Pressure Vessel Steel Exposed to Residual Bubbles After Cavitation Bubble Collapse." Corrosion 67, no. 2 (2011): 025001–1. http://dx.doi.org/10.5006/1.3548733.

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Abstract The corrosion potential of pressure vessel steel after exposure to residual bubbles and the open-circuit potential of Pt during cavitation were measured to investigate the corrosion behavior induced by residual bubbles after cavitation bubble collapse (as distinct from erosion caused by cavitation impact). The surfaces of the corrosion specimens were also investigated using x-ray photoelectron spectroscopy. It was shown that the residual bubbles shift the potential of a Pt electrode to a more anodic potential and that the oxide layer induced by the residual bubbles is different from t

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14

Su, Yanwen, Xuelin Tang, Fujun Wang, Xiaoqin Li, and Xiaoyan Shi. "Three-Dimensional Cavitation Bubble Simulations based on Lattice Boltzmann Model Coupled with Carnahan-Starling Equation of State." Communications in Computational Physics 22, no. 2 (2017): 473–93. http://dx.doi.org/10.4208/cicp.oa-2016-0112.

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AbstractThe Shan-Chen multiphase lattice Boltzmann model (LBM) coupled with Carnahan-Starling real-gas equation of state (C-S EOS)was proposed to simulate three-dimensional (3D) cavitation bubbles. Firstly, phase separation processes were predicted and the inter-phase large density ratio over 2×104was captured successfully. The liquid-vapor density ratio at lower temperature is larger. Secondly, bubble surface tensions were computed and decreased with temperature increasing. Thirdly, the evolution of creation and condensation of cavitation bubbles were obtained. The effectiveness and reliabili

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15

Aganin, A. A., A. I. Davletshin, and T. F. Khalitova. "Numerical simulation of bubble dynamics in central region of streamer." Multiphase Systems 13, no. 3 (2018): 11–22. http://dx.doi.org/10.21662/mfs2018.3.002.

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A mathematical model and a numerical technique for studying strong expansion and collapse of cavitation bubbles located in the central region of a streamer where the bubbles are almost motionless are developed. They are essentially efficient combinations of the models and techniques previously created by the authors for calculating the dynamics of interacting weakly-non-spherical bubbles in a streamer and the dynamics of a single axisymmetric bubble. The first model and technique are applied at the low-speed stage of expansion and compression of bubbles where their hydrodynamic interaction is

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16

Zhai, Yanwei, Weilin Xu, Jing Luo, and Qi Zhang. "Experimental study on the effect of a deformable boundary on the collapse characteristics of a cavitation bubble." Thermal Science 23, no. 4 (2019): 2195–204. http://dx.doi.org/10.2298/tsci1904195z.

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Cavitation phenomena widely exist in many fields such as medical treatment, chemical engineering, and hydraulic engineering. The boundary properties have a great influence on the collapse characteristics of a cavitation bubble. The interaction between a cavitation bubble and a boundary of different properties is an important part in the cavitation erosion mechanism. In this paper, cavitation bubbles under in-water pulse discharge and cavitation erosion under ultrasonic vibration were used to study the effect of a deformable boundary on the collapse characteristics of a cavitation bubble, which

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17

GONZALEZ-AVILA, SILVESTRE ROBERTO, EVERT KLASEBOER, BOO CHEONG KHOO, and CLAUS-DIETER OHL. "Cavitation bubble dynamics in a liquid gap of variable height." Journal of Fluid Mechanics 682 (June 21, 2011): 241–60. http://dx.doi.org/10.1017/jfm.2011.212.

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We report on an experimental study of cavitation bubble dynamics within sub-millimetre-sized narrow gaps. The gap height is varied, while the position of the cavitation event is fixed with respect to the lower gap wall. Four different sizes of laser-induced cavitation bubbles are studied using high-speed photography of up to 430,000 frames per second. We find a strong influence of the gap height, H, on the bubble dynamics, in particular on the collapse scenario. Also, similar bubble dynamics was found for the same non-dimensional gap height η = H/Rx, where Rx is the maximum radius in the horiz

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18

Luo, Jing, Wei-lin Xu, and Rui Li. "Collapse of cavitation bubbles near air bubbles." Journal of Hydrodynamics 32, no. 5 (2019): 929–41. http://dx.doi.org/10.1007/s42241-019-0061-x.

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19

Kucera, A., and J. R. Blake. "Approximate methods for modelling cavitation bubbles near boundaries." Bulletin of the Australian Mathematical Society 41, no. 1 (1990): 1–44. http://dx.doi.org/10.1017/s0004972700017834.

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Approximate methods are developed for modelling the growth and collapse of clouds of cavitation bubbles near an infinite and semi-infinite rigid boundary, a cylinder, between two flat plates and in corners and near edges formed by planar boundaries. Where appropriate, comparisons are made between this approximate method and the more accurate boundary integral methods used in earlier calculations. It is found that the influence of nearby bubbles can be more important than the presence of boundaries. In confined geometries, such as a cylinder, or a cloud of bubbles, the effect of the volume chan

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20

Schovanec, Petr, Darina Jasikova, Michal Kotek, et al. "Sterilization of Biofilm in Foam Using a Single Cavitation Bubble." MATEC Web of Conferences 328 (2020): 05003. http://dx.doi.org/10.1051/matecconf/202032805003.

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This article presents the sterilization of bacteria using cavitation bubbles. Cavitation generated by ultrasound creates a cavitation cloud. Therefore is more advantageous to generate the cavitation bubbles by laser-induced breakdown, because it is possible to generate individual bubbles for the purpose of study single impact and physical mechanism of acting. The cavitation bubble is generated by a Nd: YAG 532nm laser beam, a short 10ns pulse. Here, we used optics to focus the laser beam and a high-speed camera to visualize characteristics the bubble. We used the method of long-distance micros

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21

Zhu, Xi Jing, Ce Guo, Jian Qing Wang, and Guo Dong Liu. "Dynamics Modeling of Cavitation Bubble in the Grinding Area of Power Ultrasonic Honing." Advanced Materials Research 797 (September 2013): 108–11. http://dx.doi.org/10.4028/www.scientific.net/amr.797.108.

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t can particularly generate abundant cavitation bubbles in the processing of the power ultrasonic honing. The dynamics of cavitation bubbles in the grinding area are very vital to study the machining mechanism and the cutting chatter of power ultrasonic honing. Based on the Rayleigh-Plesset equation, a new dynamics model of cavitation bubble is established, considering the velocity of ultrasonic honing and honing pressure. With the superposition principle of velocity potential, the dynamics of double cavitation bubble is also established. Moreover, the dynamic characteristics of cavitation bub

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22

Zhang, Peng-li, and Shu-yu Lin. "Study on Bubble Cavitation in Liquids for Bubbles Arranged in a Columnar Bubble Group." Applied Sciences 9, no. 24 (2019): 5292. http://dx.doi.org/10.3390/app9245292.

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In liquids, bubbles usually exist in the form of bubble groups. Due to their interaction with other bubbles, the resonance frequency of bubbles decreases. In this paper, the resonance frequency of bubbles in a columnar bubble group is obtained by linear simplification of the bubbles’ dynamic equation. The correction coefficient between the resonance frequency of the bubbles in the columnar bubble group and the Minnaert frequency of a single bubble is given. The results show that the resonance frequency of bubbles in the bubble group is affected by many parameters such as the initial radius of

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23

Altay, Rana, Abdolali K. Sadaghiani, M. Ilker Sevgen, Alper Şişman, and Ali Koşar. "Numerical and Experimental Studies on the Effect of Surface Roughness and Ultrasonic Frequency on Bubble Dynamics in Acoustic Cavitation." Energies 13, no. 5 (2020): 1126. http://dx.doi.org/10.3390/en13051126.

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With many emerging applications such as chemical reactions and ultrasound therapy, acoustic cavitation plays a vital role in having improved energy efficiency. For example, acoustic cavitation results in substantial enhancement in the rates of various chemical reactions. In this regard, an applied acoustic field within a medium generates acoustic streaming, where cavitation bubbles appear due to preexisting dissolved gas in the working fluid. Upon cavitation inception, bubbles can undergo subsequent growth and collapse. During the last decade, the studies on the effects of different parameters

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24

Wang, Yi-Chun. "Effects of Nuclei Size Distribution on the Dynamics of a Spherical Cloud of Cavitation Bubbles." Journal of Fluids Engineering 121, no. 4 (1999): 881–86. http://dx.doi.org/10.1115/1.2823550.

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The nonlinear dynamics of a spherical bubble cloud with nuclei size distribution are studied numerically. The spectrum of nuclei is assumed uniform initially. The simulations employ a nonlinear continuum bubbly mixture model with consideration of the presence of bubbles of different sizes. This model is then coupled with the Rayleigh-Plesset equation for the dynamics of bubbles. A numerical method based on the integral representation of the mixture continuity and momentum equations in the Lagrangian coordinates is developed to solve this set of integro-differential equations. Computational res

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25

Cheng, Feng, and Weixi Ji. "Numerical and experimental study on dynamic characteristics of cavitation bubbles." Industrial Lubrication and Tribology 70, no. 6 (2018): 1119–26. http://dx.doi.org/10.1108/ilt-11-2016-0291.

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Purpose Cavitation bubbles cannot be avoided in the hydraulic system. Because of instability of flow and variation of water pressure, the jet often occurs in a bubble collapse. This study aims to accurately predict the shape, velocity and time of the resulting jet, so as to inhibit cavitation erosion. Design/methodology/approach In the study, a theoretical model of cavitation bubbles in the water has been developed by applying a periodic water film pressure into the Rayleigh–Plesset equation. A fourth-order in time Runge–Kutta scheme is used to obtain an accurate computation of the bubble dyna

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26

Mathew, Sunil, Theo G. Keith Theo G. Keith, and Efstratios Nikolaidis. "Numerical simulation of traveling bubble cavitation." International Journal of Numerical Methods for Heat & Fluid Flow 16, no. 4 (2006): 393–416. http://dx.doi.org/10.1108/09615530610653055.

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PurposeThe purpose is to present a new approach for studying the phenomenon of traveling bubble cavitation.Design/methodology/approachA flow around a rigid, 2D hydrofoil (NACA‐0012) with a smooth surface is analyzed computationally. The Rayleigh‐Plesset equation is numerically integrated to simulate the growth and collapse of a cavitation bubble moving in a varying pressure field. The analysis is performed for both incompressible and compressible fluid cases. Considering the initial bubble radius as a uniformly distributed random variable, the probability density function of the maximum collap

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27

KLASEBOER, EVERT, SIEW WAN FONG, CARY K. TURANGAN, et al. "Interaction of lithotripter shockwaves with single inertial cavitation bubbles." Journal of Fluid Mechanics 593 (November 23, 2007): 33–56. http://dx.doi.org/10.1017/s002211200700852x.

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The dynamic interaction of a shockwave (modelled as a pressure pulse) with an initially spherically oscillating bubble is investigated. Upon the shockwave impact, the bubble deforms non-spherically and the flow field surrounding the bubble is determined with potential flow theory using the boundary-element method (BEM). The primary advantage of this method is its computational efficiency. The simulation process is repeated until the two opposite sides of the bubble surface collide with each other (i.e. the formation of a jet along the shockwave propagation direction). The collapse time of the

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28

Lin, Hsin-Yi, Brian A. Bianccucci, Steven Deutsch, Arnold A. Fontaine, and J. M. Tarbell. "Observation and Quantification of Gas Bubble Formation on a Mechanical Heart Valve." Journal of Biomechanical Engineering 122, no. 4 (2000): 304–9. http://dx.doi.org/10.1115/1.1287171.

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Clinical studies using transcranial Doppler ultrasonography in patients with mechanical heart valves (MHV) have detected gaseous emboli. The relationship of gaseous emboli release and cavitation on MHV has been a subject of debate in the literature. To study the influence of cavitation and gas content on the formation and growth of stable gas bubbles, a mock circulatory loop, which employed a Medtronic-Hall pyrolytic carbon disk valve in the mitral position, was used. A high-speed video camera allowed observation of cavitation and gas bubble release on the inflow valve surfaces as a function o

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29

Zhang, Jing, Lingxin Zhang, and Jian Deng. "Numerical Study of the Collapse of Multiple Bubbles and the Energy Conversion during Bubble Collapse." Water 11, no. 2 (2019): 247. http://dx.doi.org/10.3390/w11020247.

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This paper investigates numerically the collapses of both a single cavitation bubble and a cluster consisting of 8 bubbles, concerning mainly on the conversions between different forms of energy. Direct numerical simulation (DNS) with volume of fluid (VOF) method is applied, considering the detailed resolution of the vapor-liquid interfaces. First, for a single bubble near a solid wall, we find that the peak value of the wave energy, or equivalently the energy conversion rate decreases when the distance between the bubble and the wall is reduced. However, for the collapses of multiple bubbles,

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30

Supponen, Outi, Danail Obreschkow, Marc Tinguely, Philippe Kobel, Nicolas Dorsaz, and Mohamed Farhat. "Scaling laws for jets of single cavitation bubbles." Journal of Fluid Mechanics 802 (August 3, 2016): 263–93. http://dx.doi.org/10.1017/jfm.2016.463.

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Fast liquid jets, called micro-jets, are produced within cavitation bubbles experiencing an aspherical collapse. Here we review micro-jets of different origins, scales and appearances, and propose a unified framework to describe their dynamics by using an anisotropy parameter $\unicode[STIX]{x1D701}\geqslant 0$, representing a dimensionless measure of the liquid momentum at the collapse point (Kelvin impulse). This parameter is rigorously defined for various jet drivers, including gravity and nearby boundaries. Combining theoretical considerations with hundreds of high-speed visualisations of

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31

Ma, Chunlong, Dongyan Shi, Chao Li, Dongze He, Guangliang Li, and Keru Lu. "Numerical Study of the Pulsation Process of Spark Bubbles under Three Boundary Conditions." Journal of Marine Science and Engineering 9, no. 6 (2021): 619. http://dx.doi.org/10.3390/jmse9060619.

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In this study, a compressible three-phase homogeneous model was established using ABAQUS/Explicit. These models can numerically simulate the pulsation process of cavitation bubbles in the free field, near the flat plate target, and near the curved boundary target. At the same time, these models can numerically simulate the strong nonlinear interaction between the cavitation bubble and its nearby wall boundaries. The mutual flow of liquid and gas and fluid solid coupling were solved by the Euler domain in simulation. The results of the numerical simulation were verified by comparing them with t

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32

Brujan, E. A. "Collapse of cavitation bubbles in blood." Europhysics Letters (EPL) 50, no. 2 (2000): 175–81. http://dx.doi.org/10.1209/epl/i2000-00251-7.

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aus der Wiesche, S. "The collapse of micro cavitation bubbles." Forschung im Ingenieurwesen 72, no. 3 (2008): 175–82. http://dx.doi.org/10.1007/s10010-008-0080-1.

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Vogel, A., W. Lauterborn, and R. Timm. "Optical and acoustic investigations of the dynamics of laser-produced cavitation bubbles near a solid boundary." Journal of Fluid Mechanics 206 (September 1989): 299–338. http://dx.doi.org/10.1017/s0022112089002314.

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The dynamics of laser-produced cavitation bubbles near a solid boundary and its dependence on the distance between bubble and wall are investigated experimentally. It is shown by means of high-speed photography with up to 1 million frames/s that jet and counterjet formation and the development of a ring vortex resulting from the jet flow are general features of the bubble dynamics near solid boundaries. The fluid velocity field in the vicinity of the cavitation bubble is determined with time-resolved particle image velocimetry. A comparison of path lines deduced from successive measurements sh

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35

Kalumuck, K. M., and G. L. Chahine. "The Use of Cavitating Jets to Oxidize Organic Compounds in Water." Journal of Fluids Engineering 122, no. 3 (2000): 465–70. http://dx.doi.org/10.1115/1.1286993.

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Exposure to ultrasonic acoustic waves can greatly enhance various chemical reactions. Ultrasonic acoustic irradiation of organic compounds in aqueous solution results in oxidation of these compounds. The mechanism producing this behavior is the inducement of the growth and collapse of cavitation bubbles driven by the high frequency acoustic pressure fluctuations. Cavitation bubble collapse produces extremely high local pressures and temperatures. Such conditions are believed to produce hydroxyl radicals which are strong oxidizing agents. We have applied hydrodynamic cavitation to contaminated

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De Chizelle, Y. Kuhn, S. L. Ceccio, and C. E. Brennen. "Observations and scaling of travelling bubble cavitation." Journal of Fluid Mechanics 293 (June 25, 1995): 99–126. http://dx.doi.org/10.1017/s0022112095001650.

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Recent observations of growing and collapsing bubbles in flows over axisymmetric headforms have revealed the complexity of the ‘micro-fluid-mechanics’ associated with these bubbles (van der Meulen & van Renesse 1989; Briancon-Marjollet et al. 1990; Ceccio & Brennen 1991). Among the complex features observed were the bubble-to-bubble and bubble-to-boundary-layer interactions which leads to the shearing of the underside of the bubble and alters the collapsing process. All of these previous tests, though, were performed on small headform sizes. The focus of this research is to analyse the

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Delale, Can F., Kohei Okita, and Yoichiro Matsumoto. "Steady-State Cavitating Nozzle Flows With Nucleation." Journal of Fluids Engineering 127, no. 4 (2005): 770–77. http://dx.doi.org/10.1115/1.1949643.

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Quasi-one-dimensional steady-state cavitating nozzle flows with homogeneous bubble nucleation and nonlinear bubble dynamics are considered using a continuum bubbly liquid flow model. The onset of cavitation is modeled using an improved version of the classical theory of homogeneous nucleation, and the nonlinear dynamics of cavitating bubbles is described by the classical Rayleigh-Plesset equation. Using a polytropic law for the partial gas pressure within the bubble and accounting for the classical damping mechanisms, in a crude manner, by an effective viscosity, stable steady-state solutions

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Ma, Chunlong, Dongyan Shi, Yingyu Chen, Xiongwei Cui, and Mengnan Wang. "Experimental Research on the Influence of Different Curved Rigid Boundaries on Electric Spark Bubbles." Materials 13, no. 18 (2020): 3941. http://dx.doi.org/10.3390/ma13183941.

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It is well known that the bubble dynamics and load characteristics of cavitation bubbles depend to a great extent on their proximity to the boundary. The purpose of this study is to explore the relationship between the boundary curvature and bubble dynamics, as well as the load characteristics, and summarize the relevant change laws. This study takes three hemispheres of different curvatures and one flat board as its main research boundaries. The hemisphere was chosen as the curved surface boundary because the hemisphere represents the simplest type of curved surface boundary. This method allo

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Ogloblina, Daria, Steffen J. Schmidt, and Nikolaus A. Adams. "Simulation and analysis of collapsing vapor-bubble clusters with special emphasis on potentially erosive impact loads at walls." EPJ Web of Conferences 180 (2018): 02079. http://dx.doi.org/10.1051/epjconf/201818002079.

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Cavitation is a process where a liquid evaporates due to a pressure drop and re-condenses violently. Noise, material erosion and altered system dynamics characterize for such a process for which shock waves, rarefaction waves and vapor generation are typical phenomena. The current paper presents novel results for collapsing vapour-bubble clusters in a liquid environment close to a wall obtained by computational fluid mechanics (CFD) simulations. The driving pressure initially is 10 MPa in the liquid. Computations are carried out by using a fully compressible single-fluid flow model in combinat

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Gonzalez Avila, Silvestre Roberto, and Claus-Dieter Ohl. "Fragmentation of acoustically levitating droplets by laser-induced cavitation bubbles." Journal of Fluid Mechanics 805 (September 23, 2016): 551–76. http://dx.doi.org/10.1017/jfm.2016.583.

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We report on an experimental study on the dynamics and fragmentation of water droplets levitated in a sound field exposed to a single laser-induced cavitation bubble. The nucleation of the cavitation bubble leads to a shock wave travelling inside the droplet and reflected from pressure release surfaces. Experiments and simulations study the location of the high negative pressures inside the droplet which result into secondary cavitation. Later, three distinct fragmentation scenarios are observed: rapid atomization, sheet formation and coarse fragmentation. Rapid atomization occurs when the exp

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Turangan, C. K., G. J. Ball, A. R. Jamaluddin, and T. G. Leighton. "Numerical studies of cavitation erosion on an elastic–plastic material caused by shock-induced bubble collapse." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 473, no. 2205 (2017): 20170315. http://dx.doi.org/10.1098/rspa.2017.0315.

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We present a study of shock-induced collapse of single bubbles near/attached to an elastic–plastic solid using the free-Lagrange method, which forms the latest part of our shock-induced collapse studies. We simulated the collapse of 40 μm radius single bubbles near/attached to rigid and aluminium walls by a 60 MPa lithotripter shock for various scenarios based on bubble–wall separations, and the collapse of a 255 μm radius bubble attached to aluminium foil with a 65 MPa lithotripter shock. The coupling of the multi-phases, compressibility, axisymmetric geometry and elastic–plastic material mod

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TOMITA, Y., P. B. ROBINSON, R. P. TONG, and J. R. BLAKE. "Growth and collapse of cavitation bubbles near a curved rigid boundary." Journal of Fluid Mechanics 466 (September 10, 2002): 259–83. http://dx.doi.org/10.1017/s0022112002001209.

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Laser-induced cavitation bubbles near a curved rigid boundary are observed experimentally using high-speed photography. An image theory is applied to obtain information on global bubble motion while a boundary integral method is employed to gain a more detailed understanding of the behaviour of a liquid jet that threads a collapsing bubble, creating a toroidal bubble. Comparisons between the theory and experiment show that when a comparable sized bubble is located near a rigid boundary the bubble motion is significantly influenced by the surface curvature of the boundary, which is characterize

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Gonzalez-Avila, Silvestre Roberto, Dang Minh Nguyen, Sankara Arunachalam, Eddy M. Domingues, Himanshu Mishra, and Claus-Dieter Ohl. "Mitigating cavitation erosion using biomimetic gas-entrapping microtextured surfaces (GEMS)." Science Advances 6, no. 13 (2020): eaax6192. http://dx.doi.org/10.1126/sciadv.aax6192.

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Cavitation refers to the formation and collapse of vapor bubbles near solid boundaries in high-speed flows, such as ship propellers and pumps. During this process, cavitation bubbles focus fluid energy on the solid surface by forming high-speed jets, leading to damage and downtime of machinery. In response, numerous surface treatments to counteract this effect have been explored, including perfluorinated coatings and surface hardening, but they all succumb to cavitation erosion eventually. Here, we report on biomimetic gas-entrapping microtextured surfaces (GEMS) that robustly entrap air when

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Nasibullayev, I. Sh, and E. Sh Nasibullaeva. "Investigation of the cavitational stability of an aluminum piston surface based on a three-dimensional model." Proceedings of the Mavlyutov Institute of Mechanics 12, no. 2 (2017): 143–51. http://dx.doi.org/10.21662/uim2017.2.021.

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The problem of determining the optimal material for manufacturing the surface of a movable element (piston) is considered, which has an increased resistance to cavitation failure, in order to justify the expediency of using structural materials for the manufacture of pistons in fuel automatics elements. On the basis of three-dimensional numerical modeling of the elasticity equations, the conditions under which a cavitation bubble collapse on the surface of a piston made of various structural materials can lead to irreversible deformations of the piston. The pressure acting on the piston determ

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Sedlář, Milan, Patrik Zima, and Martin Komárek. "Numerical Prediction of Erosive Potential of Unsteady Cavitating Flow around Hydrofoil." Applied Mechanics and Materials 565 (June 2014): 156–63. http://dx.doi.org/10.4028/www.scientific.net/amm.565.156.

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The paper attempts to assess the erosive potential of cavitation bubbles in unsteady flow of liquid over a prismatic hydrofoil using two-way coupling of the URANS and the Rayleigh-Plesset equations. The erosive potential of the cavitating flow is evaluated from the energy dissipated during the collapses of imploding cavitation bubbles near the solid surface of the hydrofoil. The bubbles are assumed spherical and the phase slip is neglected. Bubble fission is modelled using a simple break-up model. The interaction between bubbles is considered by superposing the pressure change due to pressure

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Beig, S. A., B. Aboulhasanzadeh, and E. Johnsen. "Temperatures produced by inertially collapsing bubbles near rigid surfaces." Journal of Fluid Mechanics 852 (August 2, 2018): 105–25. http://dx.doi.org/10.1017/jfm.2018.525.

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The dynamics of bubbles inertially collapsing in water near solid objects have been the subject of numerous studies in the context of cavitation erosion. While non-spherical bubble collapse, re-entrant jet dynamics and emitted shock waves have received significant interest, less is known about the temperatures thereby produced and their possible connection to damage. In this article, we use highly resolved numerical simulations of a single bubble inertially collapsing near a rigid surface to measure the temperatures produced in the fluid and estimate those in the solid, as well as to identify

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REISMAN, G. E., Y. C. WANG, and C. E. BRENNEN. "Observations of shock waves in cloud cavitation." Journal of Fluid Mechanics 355 (January 25, 1998): 255–83. http://dx.doi.org/10.1017/s0022112097007830.

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This paper describes an investigation of the dynamics and acoustics of cloud cavitation, the structures which are often formed by the periodic breakup and collapse of a sheet or vortex cavity. This form of cavitation frequently causes severe noise and damage, though the precise mechanism responsible for the enhancement of these adverse effects is not fully understood. In this paper, we investigate the large impulsive surface pressures generated by this type of cavitation and correlate these with the images from high-speed motion pictures. This reveals that several types of propagating structur

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Crespo, A., F. Castro, F. Manuel, and J. Herna´ndez. "Dynamics of an Elongated Bubble During Collapse." Journal of Fluids Engineering 112, no. 2 (1990): 232–37. http://dx.doi.org/10.1115/1.2909393.

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An analytical model is presented to describe the collapse of an elongated bubble, which appears in the core of a cavitating vortex. The flow field is assumed to be irrotational, due to a sink line. The kinematic and dynamic conditions are applied only at the tip and in the middle of the bubble surface. This simplified theory must retain losses of mechanical energy near the tips of the bubble, which are due to a microjet. In order to check the validity of this model, the irrotational flow equations have been solved numerically by using a panel method; the numerical results agree with the analyt

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DABIRI, SADEGH, WILLIAM A. SIRIGNANO, and DANIEL D. JOSEPH. "Interaction between a cavitation bubble and shear flow." Journal of Fluid Mechanics 651 (March 26, 2010): 93–116. http://dx.doi.org/10.1017/s0022112009994058.

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The deformation of a cavitation bubble in shear and extensional flows is studied numerically. The Navier–Stokes equations are solved to observe the three-dimensional behaviour of the bubble as it grows and collapses. During the collapse phase of the bubble, two re-entrant jets are observed on two sides of the bubble. The re-entrant jets are not the result of interaction with a solid wall or free surface; rather, they are formed due to interaction of the bubble with the background flow. Effects of the viscosity, surface tension and shear rate on the formation and strength of re-entrant jets are

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Zhao, Yuanyuan, Qiang Fu, Rongsheng Zhu, Guoyu Zhang, Chuan Wang, and Xiuli Wang. "Transient Process and Micro-mechanism of Hydrofoil Cavitation Collapse." Processes 8, no. 11 (2020): 1387. http://dx.doi.org/10.3390/pr8111387.

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Cavitation will cause abnormal flow, causing a series of problems such as vibration, noise, and erosion of solid surfaces. In severe cases, it may even destroy the entire system. Cavitation is a key problem to be solved for hydraulic machinery and underwater robots, and the attack angle is one of the most important factors affecting the cavitation. In order to systematically study the impact of the attack angle on the hydrofoil cavitation, the hydrofoils of NACA 4412 with different attack angles were selected to study the collapse process and hydraulic characteristics such as pressure, velocit

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