Relevant bibliographies by topics / Cavitation bubble dynamics

Academic literature on the topic 'Cavitation bubble dynamics'

Author: Grafiati
Published: 10 December 2022
Last updated: 29 January 2023

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Journal articles on the topic "Cavitation bubble dynamics"

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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 a reduction and recovery of the local static pressure. Images of single-bubble dynamics were captured with two pulse-synchronized high-speed video cameras. The shape and dynamics of single vortex cavitation bubbles are compared to the original vortex properties and the local static pressure in the vortex core, and an analysis was performed to understand the relationship between the non-cavitating vortex properties and the diameter of the elongated cavitation bubble. Acoustic emissions from the bubbles were detected during growing, splitting and collapse, revealing that the acoustic impulse created during collapse was four orders of magnitude higher than the noise emission due to growth and splitting. The dynamics and noise generation of the elongated bubbles are compared to that of spherical cavitation bubbles in quiescent flow. These data indicate that the core size and circulation are insufficient to scale the developed vortex cavitation. The non-cavitating vortex circulation and core size are not sufficient to scale the bubble dynamics, even though the single-phase pressure field is uniquely scaled by these parameters. A simple analytical model of the equilibrium state of the elongated cavitation bubble suggests that there are multiple possible equilibrium values of the elongated bubble radius, each with varying tangential velocities at the bubble interface. Thus, the details of the bubble dynamics and bubble–flow interactions will set the final bubble dimensions.
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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 speed. This equation is then cast into a nonlinear dynamical system of scaled variables which describe deviations of the flow field from its corresponding incompressible single-phase value. The solution of the initial-value problem of this dynamical system can be carried out very accurately, leading to an exact description of the hydrodynamic field for the model considered.A bubbly liquid composed of water vapour–air bubbles in water at 20 °C for two different area variations is considered, and the initial cavitation number is chosen in such a way that cavitation can occur in the nozzle. Results obtained, when bubble/bubble interactions are neglected, show solutions with flow instabilities, similar to the flashing flow solutions found recently by Wang and Brennen. Stable steady-state cavitating nozzle flow solutions, either with continuous growth of bubbles or with growth followed by collapse of bubbles, were obtained when bubble/bubble interactions were considered together with various damping mechanisms.
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Wang, Yi-Chun. "Stability Analysis of One-Dimensional Steady Cavitating Nozzle Flows With Bubble Size Distribution." Journal of Fluids Engineering 122, no. 2 (December 20, 1999): 425–30. http://dx.doi.org/10.1115/1.483273.

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A continuum bubbly mixture model coupled to the Rayleigh-Plesset equation for the bubble dynamics is employed to study one-dimensional steady bubbly cavitating flows through a converging-diverging nozzle. A distribution of nuclei sizes is specified upstream of the nozzle, and the upstream cavitation number and nozzle contraction are chosen so that cavitation occurs in the flow. The computational results show very strong interactions between cavitating bubbles and the flow. The bubble size distribution may have significant effects on the flow; it is shown that it reduces the level of fluctuations and therefore reduces the “cavitation loss” compared to a monodisperse distribution. Another interesting interaction effect is that flashing instability occurs as the flow reaches a critical state downstream of the nozzle. A stability analysis is proposed to predict the critical flow variables. Excellent agreement is obtained between the analytical and numerical results for flows of both equal bubble size and multiple bubble sizes. [S0098-2202(00)00702-1]
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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 bubble also can be simulated numerically. The results show that cavitation bubble in the grinding zone begins to grow extensively and then undergoes collapse, and even subsequent rebound and then. The variation trend of radius change of double cavitation bubble in the grinding area is more than that of single cavitation bubble by an order of magnitude.
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Ban, Zhen Hong, Kok Keong Lau, and Mohd Sharif Azmi. "Bubble Nucleation and Growth of Dissolved Gas in Solution Flowing across a Cavitating Nozzle." Applied Mechanics and Materials 773-774 (July 2015): 304–8. http://dx.doi.org/10.4028/www.scientific.net/amm.773-774.304.

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Computational modelling of dissolved gas bubble formation and growth in supersaturated solution is essential for various engineering applications, including flash vaporisation of petroleum crude oil. The common mathematical modelling of bubbly flow only caters for single liquid and its vapour, which is known as cavitation. This work aims to simulate the bubble nucleation and growth of dissolved CO2 in water across a cavitating nozzle. The dynamics of bubble nucleation and growth phenomenon will be predicted based on the hydrodynamics in the computational domain. The complex interrelated bubble dynamics, mass transfer and hydrodynamics was coupled by using Computational Fluid Dynamics (CFD) and bubble nucleation and growth model. Generally, the bubbles nucleate at the throat of the nozzle and grow along with the flow. Therefore, only the region after the throat of the nozzle has bubbles. This approach is expected to be useful for various types of bubbly flow modelling in supersaturated condition.
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WILSON, MILES, JOHN R. BLAKE, and PETER M. HAESE. "CLOUD CAVITATION DYNAMICS." ANZIAM Journal 50, no. 2 (October 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 more complex phenomenon occurs for bubbles of variable radius with local zones of collapse, with a complex frequency spectrum associated with each individual bubble, leading to both local and global collective behaviour.
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d’Agostino, Luca, Fabrizio d’Auria, and Christopher E. Brennen. "A Three-Dimensional Analysis of Rotordynamic Forces on Whirling and Cavitating Helical Inducers." Journal of Fluids Engineering 120, no. 4 (December 1, 1998): 698–704. http://dx.doi.org/10.1115/1.2820726.

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This paper investigates the linearized dynamics of three-dimensional bubbly cavitating flows in helical inducers. The purpose is to understand the impact of the bubble response on the radial and tangential rotordynamic forces exerted by the fluid on the rotor and stator stages of whirling turbomachines under cavitating conditions. The flow in the inducer annulus is modeled as a homogeneous inviscid mixture, containing vapor bubbles with a small amount of noncondensable gas. The effects of several contributions to the damping of the bubble dynamics are included in the model. The governing equations of the inducer flow are written in “body-fitted” orthonormal helical Lagrangian coordinates, linearized for small-amplitude perturbations about the mean flow, and solved by modal decomposition. The whirl excitation generates finite-speed propagation and resonance phenomena in the two-phase flow within the inducer. These, in turn, lead to a complex dependence of the lateral rotordynamic fluid forces on the excitation frequency, the void fraction, the average size of the cavitation bubbles, and the turbopump operating conditions (including, rotational speed, geometry, flow coefficient and cavitation number). Under cavitating conditions the dynamic response of the bubbles induces major deviations from the noncavitating flow solutions, especially when the noncondensable gas content of the bubbles is small and thermal effects on the bubble dynamics are negligible. Then, the quadratic dependence of rotordynamic fluid forces on the whirl speed, typical of cavitation-free operation, is replaced by a more complex behavior characterized by the presence of different regimes where, depending on the whirl frequency, the fluid forces have either a stabilizing or a destabilizing effect on the inducer motion. Results are presented to illustrate the influence of the relevant flow parameters.
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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 (April 2, 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 with stationary shock waves as well as unstable flashing flow solutions were obtained, similar to the homogeneous bubbly flow solutions given by Wang and Brennen [J. Fluids Eng., 120, 166–170, 1998] and by Delale, Schnerr, and Sauer [J. Fluid Mech., 427, 167–204, 2001]. In particular, reductions in the maximum bubble radius and bubble collapse periods are observed for stable nucleating nozzle flows as compared to the nonnucleating stable solution of Wang and Brennen under similar conditions.
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Zubalic, Emil, Daniele Vella, Aleš Babnik, and Matija Jezeršek. "Interferometric Fiber Optic Probe for Measurements of Cavitation Bubble Expansion Velocity and Bubble Oscillation Time." Sensors 23, no. 2 (January 10, 2023): 771. http://dx.doi.org/10.3390/s23020771.

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Cavitation bubbles are used in medicine as a mechanism to generate shock waves. The study of cavitation bubble dynamics plays a crucial role in understanding and utilizing such phenomena for practical applications and purposes. Since the lifetime of cavitation bubbles is in the range of hundreds of microseconds and the radii are in the millimeter range, the observation of bubble dynamics requires complicated and expensive equipment. High-speed cameras or other optical techniques require transparent containers or at least a transparent optical window to access the region. Fiber optic probe tips are commonly used to monitor water pressure, density, and temperature, but no study has used a fiber tip sensor in an interferometric setup to measure cavitation bubble dynamics. We present how a fiber tip sensor system, originally intended as a hydrophone, can be used to track the expansion and contraction of cavitation bubbles. The measurement is based on interference between light reflected from the fiber tip surface and light reflected from the cavitation bubble itself. We used a continuous-wave laser to generate cavitation bubbles and a high-speed camera to validate our measurements. The shock wave resulting from the collapse of a bubble can also be measured with a delay in the order of 1 µs since the probe tip can be placed less than 1 mm away from the origin of the cavitation bubble. By combining the information on the bubble expansion velocity and the time of bubble collapse, the lifetime of a bubble can be estimated. The bubble expansion velocity is measured with a spatial resolution of 488 nm, half the wavelength of the measuring laser. Our results demonstrate an alternative method for monitoring bubble dynamics without the need for expensive equipment. The method is flexible and can be adapted to different environmental conditions, opening up new perspectives in many application areas.
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Wang, Yi-Chun, and C. E. Brennen. "One-Dimensional Bubbly Cavitating Flows Through a Converging-Diverging Nozzle." Journal of Fluids Engineering 120, no. 1 (March 1, 1998): 166–70. http://dx.doi.org/10.1115/1.2819642.

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A nonbarotropic continuum bubbly mixture model is used to study the one-dimensional cavitating flow through a converging-diverging nozzle. The nonlinear dynamics of the cavitation bubbles are modeled by the Rayleigh-Plesset equation. Analytical results show that the bubble/bubble interaction through the hydrodynamics of the surrounding liquid has important effects on this confined flow field. One clear interaction effect is the Bernoulli effect caused by the growing and collapsing bubbles in the nozzle. It is found that the characteristics of the flow change dramatically even when the upstream void fraction is very small. Two different flow regimes are found from the steady state solutions and are termed: quasi-steady and quasi-unsteady. The former is characterized by large spatial fluctuations downstream of the throat which are induced by the pulsations of the cavitation bubbles. The quasi-unsteady solutions correspond to flashing flow. Bifurcation occurs as the flow transitions from one regime to the other. An analytical expression for the critical bubble size at the bifurcation is obtained. Physical reasons for this quasi-static instability are also discussed.
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Dissertations / Theses on the topic "Cavitation bubble dynamics"

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Salhan, A. "Dynamics of an explosion bubble close to a structure." Thesis, University of Brighton, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323638.

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Lind, Steven John. "A numerical study of the effect of viscoelasticity on cavitation and bubble dynamics." Thesis, Cardiff University, 2010. http://orca.cf.ac.uk/46566/.

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In this thesis two different models and numerical methods have been developed to investigate the dynamics of bubbles in viscoelastic fluids. In the interests of gaining crucial initial insights, a simplifed system of governing equations is first considered. The ambient fluid around the bubble is considered incompressible and the flow irrotational. Viscoelastic effects are included through the normal stress balance at the bubble surface. The governing equations are then solved using a boundary element method. With regard to spherical bubble collapse, the model captures the behaviour seen in other studies, including the damped oscillation of the bubble radius with time and the existence of an elastic-limit solution. The model is extended in order to investigate multi-bubble dynamics near a rigid wall and a free surface. It is found that viscoelastic effects can prevent jet formation, produce cusped bubble shapes, and generally prevent the catastrophic collapse that is seen in the inviscid cases. The model is then used to investigate the role of viscoelasticity in the dynamics of rising gas bubbles. The dynamics of bubbles rising in a viscoelastic liquid are characterised by three phenomena: the trailing edge cusp, negative wake, and the rise velocity jump discontinuity. The model predicts the cusp at the trailing end of a rising bubble to a high resolution. However, the irrotational assumption precludes the prediction of the negative wake. The corresponding absence of the jump discontinuity supports the hypothesis that the negative wake is primarily responsible for the jump discontinuity, as mooted in previous studies. A second model is developed with the intention of gaining further insight into the role of viscoelasticity and corroborating the finndings of the first model. This second model employs the full compressible governing equations in a two dimensional domain. The equations are solved using the spectral element method, while the two phases are represented by "marker particles". The results are in qualitative agreement with the first model and confirm that the findings presented are a faithful account of bubble dynamics in viscoelastic fluids.
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Walters, Michael. "An investigation into the effects of viscoelasticity on cavitation bubble dynamics with applications to biomedicine." Thesis, Cardiff University, 2015. http://orca.cf.ac.uk/73461/.

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Diaz, Mario Alfonso. "High-Frequency Ultrasound Drug Delivery and Cavitation." BYU ScholarsArchive, 2007. https://scholarsarchive.byu.edu/etd/1050.

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The viability of a drug delivery system which encapsulates chemotherapeutic drugs (Doxorubicin) in the hydrophobic core of polymeric micelles and triggers release by ultrasound application was investigated at an applied frequency of 500 kHz. The investigation also included elucidating the mechanism of drug release at 70 kHz, a frequency which had previously been shown to induce drug release. A fluorescence detection chamber was used to measure in vitro drug release from both Pluronic and stabilized micelles and a hydrophone was used to monitor bubble activity during the experiments. A threshold for release between 0.35 and 0.40 in mechanical index was found at 70 kHz and shown to correspond with the appearance of the subharmonic signal in the acoustic spectrum. Additionally, drug release was found to correlate with increase in subharmonic emission. No evidence of drug release or of the subharmonic signal was detected at 500 kHz. These findings confirmed the role of cavitation in ultrasonic drug release from micelles. A mathematical model of a bubble oscillator was solved to explore the differences in the behavior of a single 10 um bubble under 70 and 500 kHz ultrasound. The dynamics were found to be fundamentally different; the bubble follows a period-doubling route to chaos at 500 kHz and an intermittent route to chaos at 70 kHz. It was concluded that this type of "intermittent subharmonic" oscillation is associated with the apparent drug release. This research confirmed the central role of cavitation in ultrasonically-triggered drug delivery from micelles, established the importance of subharmonic bubble oscillations as an indicator, and expounded the key dynamic differences between 70 and 500 kHz ultrasonic cavitation.
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Montes, Quiroz William. "Étude expérimentale de la stabilité d'une bulle unique de cavitation acoustique : application à la nucléation de la glace déclenchée par cavitation." Thesis, Ecole nationale des Mines d'Albi-Carmaux, 2014. http://www.theses.fr/2014EMAC0002/document.

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Cette étude sur la stabilité d’une bulle unique de cavitation acoustique s’inscrit dans le cadre d’un projet ANR démarré en septembre 2009 (SONONUCLICE ANR-09-BLAN-0040-02). Elle se situe dans la continuité des travaux sur l’optimisation du procédé de lyophilisation de produits pharmaceutiques menés par l’équipe « Transferts couplés de matière et de chaleur » du laboratoire LAGEP (ESCPE/UCB, Lyon), équipe porteuse du projet, et des travaux sur la cristallisation assistée par ultrasons du laboratoire RAPSODEE. L’application des ultrasons de puissance dans un liquide produit des milliards de bulles. Ce phénomène est appelé cavitation acoustique. Les bulles formées ne font pas toutes la même taille, leurs oscillations ne sont pas en phase, et leur densité dans le fluide est très inhomogène : ce phénomène très complexe implique donc de nombreuses variables difficiles à isoler. Même si le phénomène est chaotique, la cavitation permet d’observer des effets macroscopiques notables sur la nucléation et la croissance des cristaux de glace dans une solution sous-refroidie. Ces effets sont d’une importance capitale pour des applications de congélation ou de lyophilisation. Bien que les effets des ultrasons présentent des intérêts certains sur la cristallisation, leur origine reste mal connue. L’observation directe des milliards de bulles ne fournit aucune piste sur les mécanismes microscopiques mis en jeu. Afin d’isoler l’acteur essentiel de ces effets, l’étude menée vise à isoler une bulle de cavitation acoustique. Pour cela, une cellule de lévitation carrée en verre a été conçue. Le verre a été retenu comme matériau pour sa rigidité et sa transparence. Dans cette cellule, une onde de pression acoustique est imposée par un piézoélectrique collé à la base de la cellule. Il a été possible de reconstruire la dynamique de la bulle. Les étapes d’expansion, d’implosion et de rebonds sont clairement visibles. En vue de l’étude de la cristallisation, un principe de détection des cristaux a été spécifiquement élaboré. Il repose sur le suivi de la modification de la périodicité de la bulle (mesurée par un microphone) provoquée par l’apparition d’un corps étranger à son voisinage. Une méthode utilisant la corrélation de signaux acoustiques du microphone filtré à la fréquence d’excitation du PZT et les harmoniques du signal du microphone directe a été développée. Elle permet de connaître le régime d’oscillation de la bulle et de détecter toutes les modifications de sa dynamique. Des expériences de perturbation de la bulle ont été menées à l’aide d’une micro fibre de 7 μm. Le principe de détection est alors mis en oeuvre pour déclencher l’enregistrement d’images par une caméra rapide lors des derniers instants d’existence de la bulle. Cette méthode devrait permettre de détecter l’apparition des premiers cristaux au voisinage de la bulle. Autour de la cellule de lévitation, différents systèmes ont été développés. Un système de dégazage et de remplissage de la cellule de cavitation ont permis de travailler avec de l’eau ayant des teneurs en gaz dissous de l’ordre de 20 % de la saturation. Un système d’éclairage avec une LED de puissance et un jeu de lentilles optiques a été conçu pour visualiser correctement la bulle
This study of the stability of an acoustic cavitation bubble is part of an ANR project started in September 2009 (SONONUCLICE ANR-09-BLAN-0040-02). It takes place in the continuity of the works on the optimization process of lyophilisation of pharmaceutical products conducted by the “Transferts couplés de matière et de chaleur” team of LAGEP (ESCPE/UCB, Lyon) laboratory, which is the project’s team leader, and the studies of ultrasound-assisted crystallization in the RAPSODEE Centre. The application of power ultrasound into liquids produces thousands of bubbles. This phenomenon is called acoustic cavitation. The bubbles formed don’t have the same size, their oscillations are not in phase, and their spatial density in the fluid is not homogeneous: this phenomenon is very complex and involves multiple variables very difficult to isolate. Even if this phenomenon is chaotic, it allows to observe macroscopic effects on the nucleation and crystal growth of ice in undercooled solutions. These effects have a capital importance for industrial applications such as freezing and lyophilisation (also called freeze drying). Although ultrasound has a noticeable influence on crystallization, the origin of these effects remains unclear. The multi-bubble approach doesn’t give any hint on the microscopic mechanisms involved. In order to isolate the main actor of these effects, this study aims at isolating a single cavitation bubble. To do that, a cubic levitation cell made of optical glass was build. In this cell, an acoustic pressure is applied by a piezoelectric glued to the bottom’s external face of the cell. With this cell is possible to rebuild all the oscillations states of the bubble, and in combination with our optical system we can see the bubble’s dynamics and its stages like: expansion, collapse and rebounds. For the crystallization part of this study, a crystal’s detection system was developed. It is based on the variations of the bubble’s periodicity (measured by a microphone pill) introduced by the sudden appearance of a foreign body in its vicinity. This method requires the correlation of the signals from a filtered microphone and the harmonics signals from a microphone, in order to known the oscillation state of the bubble and detect variations on the bubble’s dynamics. Experiments of bubble perturbations by a thin wire were made. The detection system was used to trigger the image recording of a fast camera, in order to capture the final moments of the bubble. This method should be allowing the early detection of new crystals in the proximity of the bubble. Around the levitation cell, various systems have been developed. A degassing and filling system for the cavitation cell allow us to work with degased water around the 20 % of its saturated concentration of air. An illumination system based in a power LED and a set of optical lenses was used to view the bubble correctly
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Carleton, James Richard. "The Effect of Electrohydraulic Discharge on Flotation Deinking Efficiency." Thesis, Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/6971.

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Firing an underwater spark discharge generates an expanding plasma which causes a spherical shockwave to propagate through the surrounding water. The shockwave can have many effects, including resonance effects on bubbles, mechanical destructive effects on solid surfaces and living organisms, and sonochemical oxidative effects on particles and chemical species present in the water. This phenomenon has been shown to improve the efficiency of ink removal in a laboratory flotation deinking cell, while simultaneously decreasing fiber loss. These process improvements are attributed to the sonochemical oxidation of ink particle surfaces, caused by shockwave-induced cavitation. This finding is supported by zeta potential measurements. Sparking was found to reduce the zeta potential of ink particles by up to 20 mV. When sparking was performed during deinking, no effect was found on either ink removal or solids loss. However, when the pulp was pretreated with sparking before flotation, a significant improvement was seen in the brightness gain. Further, fiber loss was decreased by up to 25% in a single flotation stage. The economics of this process are attractive; payback is on the order of three months based on fiber savings alone. Also, at about 1.5 kJ per spark, the power requirements are minimal with respect to the benefit derived.
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Bossio, Castro Alvaro Manuel. "Lagrangeovský model pohybu kavitační bubliny." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-401546.

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In this thesis, the dynamics of an isolated cavitation bubble submerged in a steady flow is studied numerically. A Lagrangian-Eulerian approach is considered, in which properties of the fluid are computed first by means of Eulerian methods (in this study the commercial CFD software Ansys Fluent 19 was used) and the trajectory of the bubble is then computed in a Lagrangian fashion, i.e. the bubble is considered as a small particle moving relative to the fluid, due to the effect of several forces depending on fluid's pressure field, fluid's velocity field and bubble's radius. Bubble's radius dynamics, modeled by Rayleigh-Plesset equation, has a big influence on its kinetics, so a special attention is given to it. Two study cases are considered. The first one, motivated by acoustic cavitation is concerned with the response of the bubble's radius in a static flow under the influence of an oscillatory pressure field, the second one studies the trajectory of the bubble submerged in a fluid passing by a Venturi tube and a sharp-edged orifice plate.
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Bienaime, Diane. "Embolie dans les plantes : dynamique de l'invasion d'air dans des réseaux hydrauliques naturels et artificiels sous pression négative." Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAY056/document.

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Pour assurer le transport de la sève des racines vers les feuilles, les plantes vasculaires génèrent de très fortes dépressions dans le liquide, pouvant atteindre -200 bar, au niveau des feuilles. Cette dépression « tire » sur la colonne d'eau contenue dans l'appareil vasculaire de l'arbre. La cohésion de l'eau maintient la sève sous forme liquide. Cet état métastable peut se rompre : des bulles de cavitation apparaissent. Elles créent un « bouchon » d'air dans le réseau hydraulique de la plante et gênent la circulation de la sève. C'est ce que l'on appele l'embolie. Si ce phénomène se généralise, il peut provoquer la mort de la plante.Ce travail de thèse est consacré à 'invasion d'air dans des réseaux hydrauliques naturels ou artificiels initialement à pression négative. Nous avons d'abord étudié l'embolie dans les feuilles. Nous avons développé une technique novatrice permettant de relever la propagation spatiale de l'embolie dans le réseau hydraulique des feuilles. Nous montrons que l'embolie, quelque soit l'espèce, se propage par à-coups des plus grosses nervures aux plus petites.Afin de comprendre les lois physiques sous-jacentes, nous utilisons deux systèmes modèles. Nous réalisons d'abord des réseaux artificiels dans un hydrogel reproduisant les caractéristiques de la circulation de la sève ascendante. Après la relaxation de la tension dans le réseau par l'apparition de la bulle, nous observons des oscillations de surface et une croissance lente de la bulle, liée à l'évacuation de l'eau à travers l'hydrogel. Cette croissance peut atteindre un régime quasi-stationnaire. Ce systèmes ne nous permettant pas de reproduire toutes les caractéristiques géométriques du xylème, nous présentons une modélisation informatique reposant sur l'analogie entre réseaux hydrauliques et électrocinétique. Nous reproduisons les caractéristiques du xylème dans lequel circule la sève : les éléments conducteurs sont reliées par les ponctuations, des valves protégeant la plante de l'embolie. Nous retrouvons les à-coups caractéristiques de la propagation de l'embolie dans les feuilles.Enfin, nous discutons l'application des résultats précèdents dans le cas du bois et nous présentons quelques résultats obtenus sur du pin sylvestre
To assure the transport from the roots to the leaves, vascular plants create strong depressions in the sap, next to -200 bars. This depression pulls the water column contained by the tree vascular system. The water cohesion keeps the sap under liquid state. This metastable state can breaks: cavitation bubbles appear. They create an air plug inside the plant hydraulic network and impede sap flow. This phenomena called embolism could lead to the plant death by preventing the sap transport.This thesis is dedicated to the air invasion into hydraulics networks under negative pressure. First, we study the leaf embolism. We developed a new technique which allows us to record the spatial propagation of embolism in leaves hydraulic network. We show that the embolism propagates by steps from biggest veins to smallest veins.Next, in order to understand the underlying physical laws, we use two model systems. We build artificial networks in a hydrogel which mimics the sap flow characteristics. After the relaxation of the negative pressure in the network by the nucleation of a bubble, we observe surface oscillations and the slow growth of the bubble. This growth is linked to the water transport through the hydrogel and can reach a stationary regime.As we are not able to reproduce all the characteristics of the leaf network with the hydrogel, we create a computer modeling based on the Ohm analogy between hydraulics networks and electrical circuits. We reproduce the specific features of the xylem which transport the sap: the conduits are linked by pits, small valves which limit the progression of the embolism. We were able to recover the distinctiveness steps in embolism.Finally, we discuss the application of the preceding results to wood and we present some results on Pinus sylvestris
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Sarkar, Prasanta. "Simulation de l'érosion de cavitation par une approche CFD-FEM couplée." Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAI016/document.

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Ce travail de recherche est dédié à la compréhension des mécanismes physiques de l’érosion de cavitation dans un fluide compressible à l’échelle fondamentale de l’implosion d’une bulle de cavitation. Suite à l’implosion d’une bulle de vapeur à proximité d’une surface solide, des très hautes pressions sont générées. Ces pressions sont considérées responsables de l’endommagement (érosion) des surfaces solides observé dans la plupart des applications. Notre approche numérique démarre avec le développement d’un solveur compressible capable de résoudre les bulles de cavitation au sein du code volumes finis YALES2 en utilisant un simple modèle de mélange homogène des phases fluides. Le solveur est étendu à une approche ALE (Arbitraire Lagrangien Eulérien) dans le but de mener des simulations d’interaction fluide-structure sur un maillage mobile. La réponse du matériau solide est calculée avec le code de calcul éléments finis Cast3M, et nous a permis de mener des simulation avec un couplage d’abord monodirectionnel, ensuite bidirectionnel, entre le fluide et le solide. On compare des résultats obtenus à deux dimensions, puis à trois, avec des observations expérimentales. On discute les chargements de pression estimés, et les réponses de différents matériaux pour des implosions de bulle à des différentes distances de la surface. Enfin, à travers l’utilisation de simulations avec couplage bidirectionnel entre fluide et solide, on identifie l’amortissement des chargements de pression pour les différents matériaux
This research is devoted to understanding the physical mechanism of cavitation erosion in compressible liquid flows on the fundamental scale of cavitation bubble collapse. As a consequence of collapsing bubbles near solid wall, high pressure impact loads are generated. These pressure loads are believed to be responsible for the erosive damages on solid surface observed in most applications. Our numerical approach begins with the development of a compressible solver capable of resolving the cavitation bubbles in the finite-volume solver YALES2 employing a simplified homogenous mixture model. The solver is extended to Arbitrary Lagrangian-Eulerian formulation to perform fluid structure interaction simulation with moving mesh capabilities. The material response is resolved with the finite element solver Cast3M, which allowed us to perform one-way and two-way coupled simulations between the fluid and solid domains. In the end, we draw comparisons between 2D and 3D vapor bubble collapse dynamics and compare them with experimental observations. The estimated pressure loads on the solid wall and different responses of materials for attached and detached bubble collapses are discussed. Finally, the damping of pressure loads by different materials is identified with two-way coupled fluid-structure interaction
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Guillet, Thibault. "Cavitation & Supercavitation : From a bluff to a stable streamlined projectile." Thesis, Institut polytechnique de Paris, 2019. http://www.theses.fr/2019IPPAX007.

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La supercavitation utilise le changement de phase du liquide-vapeur au mouvement rapide d'un projectile pour le profiler et ainsi réduire sa traînée. Dans cette thèse, nous abordons la supercavitation sous différents aspects : la cavitation induite par accélération en environnement confiné, la réduction de traînée engendrée par la cavité d'air et la stabilité des trajectoires des objets ainsi profilés. Plus précisément, nous nous intéressons dans un premier temps, à la fois expérimentalement et théoriquement, à la croissance des bulles de cavitation. Après avoir montré que cette croissance n'est possible que dans une enceinte déformable, nous prouvons, dans le cas particulier où la dépression à l'origine de l'apparition de ces bulles est transitoire, que leur dynamique suit l'équation de Rayleigh-Plesset et que leur rayon maximal peut être prédit analytiquement. Si la vitesse du projectile est assez grande, les bulles de cavitation grossissent et coalescent pour former une unique bulle, accrochée à la surface du projectile et située dans son sillage: c'est le régime dit de supercavitation. Nous montrons que ce régime peut être reproduit dans un canal hydraulique "classique", à faible vitesse, en injectant de l'air à la surface du projectile. Avec ce dispositif expérimental, nous démontrons que la taille relative de la bulle est uniquement déterminée par un paramètre adimensionnel. Dans le cas d'une sphère, nous mesurons la modification de trainée ainsi engendrée. Enfin, le système global {sphère + bulle} peut être considéré comme un projectile profilé de densité inhomogène. Nous montons que de tels projectiles profilés, suivent des trajectoires courbes après leur impact dans l'eau. Nous démontrons, à la fois expérimentalement et théoriquement, que la forme de leur trajectoire est déterminée par leur vitesse d'impact, leur forme et la position de leur centre de gravité
Supercavitation uses the phase transition liquid-gaseous, triggered by the fast motion of a projectile, to streamline its shape and reduce its drag. In this thesis, we address several aspects of supercavitation: cavitation triggered by acceleration in a confined geometry, drag reduction induced by the air cavity and the stability of the trajectory of such streamlined projectiles. More precisely, we first study both experimentally and theoretically the growth of cavitation bubbles. After showing that their growth is uniquely possible in a deformable container, we prove, in the case of a transient pressure drop, that the dynamic of the bubbles follows the Rayleigh-Plesset equation and that their maximum radius can analytically be predicted. If the velocity of the projectile is high enough, the bubbles grow and coalesce to form a large bubble pinned at the surface of the projectile and located in its wake: this is the so-called supercavitation regime. We show that this regime can be mimicked in "regular", low velocity, hydrodynamic tunnel via air injection at the surface of the projectile. In this set-up, we demonstrate that the relative size of the bubble is governed by an unique dimensionless parameter. In the case of a sphere, we measure the drag modification induced by the presence of the bubble. Finally, the overall system {sphere + bubble} is analogous to a inhomogeneous streamlined projectile. We show that such streamlined projectiles can follows curved paths, following their impact on water. We demonstrate, both experimentally and theoretically, that the morphology of their trajectory is governed by the impact velocity, their shape and the position of the center of mass of the projectile
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Books on the topic "Cavitation bubble dynamics"

1

Cavitation and bubble dynamics. New York: Oxford University Press, 1995.

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Yasui, Kyuichi. Acoustic Cavitation and Bubble Dynamics. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-68237-2.

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Blake, J. R. Bubble Dynamics and Interface Phenomena: Proceedings of an IUTAM Symposium held in Birmingham, U.K., 6-9 September 1993. Dordrecht: Springer Netherlands, 1994.

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Martin, Rein. Numerische Untersuchung der Dynamik heterogener Stosskavitation. Göttingen: Max-Planck-Institut für Strömungsforschung, 1987.

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Leighton, T. G. The cavitation of bubbles containing mon-, di-. and tri-atomic gases: Discussion through modelling of dynamics using the Gilmore equation. Southampton, U.K: University of Southampton, Institute of Sound and Vibration Research, Fluid Dynamics and Acoustics Group, 1995.

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Ji guang ji chuan ye ti jie zhi de kong hua yu sheng fu she: Cavitation and Sound Radicalization with Laser-induced Breakdown in Liquid. Beijing: Guo fang gong ye chu ban she, 2013.

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Symposium on Naval Hydrodynamics (21st 1996 Trondheim, Norway). Twenty-First Symposium on Naval Hydrodynamics: Wave-induced ship motions and loads, frontier experimental techniques, wake dynamics, viscous ship hydrodynamics, water entry, wave hydrodynamics/stratified flow, bluff body hydrodynamics, hydrodynamics in ship design, shallow water hydrodynamics, cavitation and bubbly flows, propulsor hydrodynamics/hydroacoustics, fluid dynamics in the naval context, CFD validation. Washington, D.C: National Academy Press, 1997.

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Cavitation and Bubble Dynamics. Cambridge University Press, 2013.

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Brennen, Christopher Earls. Cavitation and Bubble Dynamics. Cambridge University Press, 2013.

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Cavitation and Bubble Dynamics. Elsevier, 2021. http://dx.doi.org/10.1016/c2019-0-04350-6.

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Book chapters on the topic "Cavitation bubble dynamics"

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Shah, Y. T., A. B. Pandit, and V. S. Moholkar. "Cavitation Bubble Dynamics." In The Plenum Chemical Engineering Series, 15–54. Boston, MA: Springer US, 1999. http://dx.doi.org/10.1007/978-1-4615-4787-7_2.

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Brujan, Emil-Alexandru. "Bubble Dynamics." In Cavitation in Non-Newtonian Fluids, 63–116. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-15343-3_3.

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Pflieger, Rachel, Sergey I. Nikitenko, Carlos Cairós, and Robert Mettin. "Bubble Dynamics." In Characterization of Cavitation Bubbles and Sonoluminescence, 1–38. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-11717-7_1.

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Biryukov, Dmitry A., Denis N. Gerasimov, and Eugeny I. Yutin. "Dynamics of a Cavitating Bubble." In Cavitation and Associated Phenomena, 226–78. Boca Raton: CRC Press, 2022. http://dx.doi.org/10.1201/9780367853495-7.

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Robinson, P. B., and J. R. Blake. "Dynamics of cavitation bubble interactions." In Fluid Mechanics and Its Applications, 55–64. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-0938-3_5.

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Shin, Byeong Rog, and Young-Joon An. "Numerical Method for Shock-Cavitation Bubble Interaction Problems." In Computational Fluid Dynamics 2008, 611–16. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-01273-0_81.

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Shin, Byeong Rog. "Numerical Simulation of Cavitation Bubble Collapse Near Wall." In Computational Fluid Dynamics 2010, 913–15. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-17884-9_123.

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van Wijngaarden, L. "Bubble dynamics and the sound emitted by cavitation." In Fluid Mechanics and Its Applications, 181–93. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-0938-3_17.

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Lauer, E., X. Y. Hu, S. Hickel, and N. A. Adams. "Numerical Investigation of Cavitation Bubble Dynamics Near Walls." In 28th International Symposium on Shock Waves, 69–75. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-25685-1_12.

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Chahine, Georges L., Chao-Tsung Hsiao, and Reni Raju. "Scaling of Cavitation Bubble Cloud Dynamics on Propellers." In Advanced Experimental and Numerical Techniques for Cavitation Erosion Prediction, 345–72. Dordrecht: Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-017-8539-6_15.

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Conference papers on the topic "Cavitation bubble dynamics"

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Nohmi, Motohiko, Toshiaki Ikohagi, and Yuka Iga. "Numerical Prediction Method of Cavitation Erosion." In ASME 2008 Fluids Engineering Division Summer Meeting collocated with the Heat Transfer, Energy Sustainability, and 3rd Energy Nanotechnology Conferences. ASMEDC, 2008. http://dx.doi.org/10.1115/fedsm2008-55126.

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Bubble behavior in cavitating flow is analyzed for the development of practical erosion prediction method. CFD analysis with cavitation model is carried out for the flow field around a hydrofoil. Afterwards computation of bubble dynamics is carried out coupled with flow field CFD results by one way approach. For the bubble dynamic calculation, Rayleigh-Plesset equation is adopted. Bubble behaviors in the collapse of cloud cavitaion and in the break off of sheet cavity are analyzed. Bubble behavior at the trailing edge of sheet cavity is also calculated. It is observed that steep pressure change in the flow causes oscillation of the bubbles. Based on this qualitative information of bubble behaviors, numerical cavitation aggressiveness is simply defined. This numerical cavitation aggressiveness is a function of local void fraction and pressure over the solid surface and can be calculated directly from the cavitating flow field CFD results without concerning bubble dynamics.
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Zhou, Yufeng, and Wilson Xiaobin Gao. "Bubble Dynamics with the Progress of Histotripsy." In 8th International Symposium on Cavitation. Singapore: Research Publishing Services, 2012. http://dx.doi.org/10.3850/978-981-07-2826-7_102.

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Ibn Azam, Fahad, Boo Cheong Khoo, Siew-Wan Ohl, and Evert Klaseboer. "Dynamics of a Bubble in a Narrow Gap." In 8th International Symposium on Cavitation. Singapore: Research Publishing Services, 2012. http://dx.doi.org/10.3850/978-981-07-2826-7_232.

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Sagar, Hemant, and Ould el Moctar. "A Single Cavitation Bubble Induced Damage." In ASME 2022 41st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/omae2022-78536.

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Abstract In the present work, we experimentally and numerically investigated the dynamics of a millimeter-sized cavitation bubble generated nearby a solid surface. In experiments, bubbles are induced by a focused Nd-YAG laser generating plasma. A specimen of the commercially pure aluminum surface was placed nearby a bubble at varying relative wall distances. Here, the relative wall distance is a ratio of the distance between the bubble center and specimen surface, and the maximum radius of the bubble. In experiments, we captured the bubble’s dynamics by back illumination method using a highspeed camera. Damage obtained was characterized by an optical microscope and profilometer. The surface profiles and damage patterns quantified the damage characteristics. The three-dimensional flow was captured numerically by solving the Navier-Stokes equations in an Euler-Euler approach with barotropic equations of state. The computations were performed assuming both water and vapor as compressible phases. The dynamics of a single bubble obtained in computations were compared with the experiments for shapes and collapsing times. The computed characteristics of flow around a bubble near the solid surface, e.g. impact velocities and pressures were also discussed. Additionally, the dynamics of a microscopic bubble collapse near the surface was also investigated to compute collapse-induced wall shear rate and flow around the collapsing bubble. The results of numerical simulations were compared with the existing experimental data. The comparisons showed, a good qualitative and quantitative agreement. Overall, the numerical method well reflected the dynamics bubble up to three collapses and resolved flow around the bubble. The statistical data of pits obtained are also useful in deriving loads induced by a single bubble collapse. Overall, this work extensively comprises the single cavitation bubble dynamics and induced damage. This article summarizes the investigations of Sagar (2018) and Sagar & el Moctar (2020).
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Hatanaka, Shin-ichi. "Sonoluminescence, sonochemistry and bubble dynamics of single bubble cavitation." In NONLINEAR ACOUSTICS STATE-OF-THE-ART AND PERSPECTIVES: 19th International Symposium on Nonlinear Acoustics. AIP, 2012. http://dx.doi.org/10.1063/1.4749322.

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Johnsen, Eric, and Chengyun Hua. "Bubble Dynamics in a Standard Linear Solid (Viscoelastic) Medium." In 8th International Symposium on Cavitation. Singapore: Research Publishing Services, 2012. http://dx.doi.org/10.3850/978-981-07-2826-7_214.

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Lauterborn, W., T. Kurz, and D. Schanz. "A Look Into The Bubble Interior by Molecular Dynamics Simulation." In 8th International Symposium on Cavitation. Singapore: Research Publishing Services, 2012. http://dx.doi.org/10.3850/978-981-07-2826-7_062.

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Ida, Masato, Takashi Naoe, and Masatoshi Futakawa. "Numerical Study of Gas and Cavitation Bubble Dynamics in Liquid Mercury Under Negative Pressure." In ASME/JSME 2007 5th Joint Fluids Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/fedsm2007-37297.

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Gas and cavitation bubble dynamics have been studied numerically to evaluate the effect of gas bubble injection on the suppression of cavitation inception. In our previous studies it has been demonstrated by direct observation that cavitation occurs in liquid mercury when mechanical impacts are imposed and it must seriously shorten the lifetime of nuclear facilities using liquid mercury, such as the mercury spallation target of the J-PARC (Japan Proton Accelerator Research Complex). In this paper, using single-bubble and multibubble models we have performed numerical studies on the dynamics of cavitation bubbles in liquid mercury with and without preexisting gas bubbles, and have clarified that if the mercury involves gas bubbles much larger than the cavitation nuclei, cavitation inception is effectively suppressed due to the positive pressure radiated by the gas bubbles. Our recent experimental results (not shown in the present paper) have confirmed the effectiveness of the bubble injection.
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Liu, Xiu-Mei, Xin-Hua Liu, Jie He, You-Fu Hou, Jian Lu, and Xiao-Wu Ni. "Cavitation Bubble Dynamics in Liquids of Different Viscosity." In 2010 Symposium on Photonics and Optoelectronics (SOPO 2010). IEEE, 2010. http://dx.doi.org/10.1109/sopo.2010.5504305.

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Hardy, Luke A., Joshua D. Kennedy, Christopher R. Wilson, Pierce B. Irby, and Nathaniel M. Fried. "Cavitation bubble dynamics during thulium fiber laser lithotripsy." In SPIE BiOS, edited by Bernard Choi, Nikiforos Kollias, Haishan Zeng, Hyun Wook Kang, Brian J. F. Wong, Justus F. Ilgner, Guillermo J. Tearney, et al. SPIE, 2016. http://dx.doi.org/10.1117/12.2208168.

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Reports on the topic "Cavitation bubble dynamics"

1

Baker, B. B., and B. R. Parkin. A Multiple-Scales Partial Solution of the Pulse-Forced Rayleigh-Plesset Equation of Cavitation Bubble Dynamics. Fort Belvoir, VA: Defense Technical Information Center, February 1988. http://dx.doi.org/10.21236/ada193733.

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Lathrop, B. W., and B. R. Parkin. A Two-Scale Solution of the Forced Rayleigh-Plesset Equation Governing the Dynamics of Cavitation Bubble Vaporous Growth. Fort Belvoir, VA: Defense Technical Information Center, February 1991. http://dx.doi.org/10.21236/ada232129.

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