The behavior of a cavitation bubble near a rigid wall

Zhang, Sheguang; Duncan, James H.; Chahine, Georges L.

doi:10.1007/978-94-011-0938-3_41

Cited by 9 publications

(3 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We consider an initially spherical bubble of radius 50 mm, located at a distance of X ¼ 1.5 mm from a flat material surface and subject it to a time-varying pressure field as represented in figure 2 This imposed pressure variation is different from that used in many classical studies on bubble collapse near a wall and where a bubble with a maximum radius is suddenly subjected to a pressure higher than the internal pressure such as in [71][72][73][74]. Here, bubble growth is included (this allows one to include standoff distances smaller than the bubble maximum radius and covers a large range of applications), and the time-varying pressure field represents for example the pressure encountered by a bubble nucleus captured in the shear layer of a cavitating jet.…”

Section: Problem Descriptionmentioning

confidence: 99%

Modelling cavitation erosion using fluid–material interaction simulations

Chahine¹,

Hsiao²

2015

Interface Focus.

Self Cite

View full text Add to dashboard Cite

Material deformation and pitting from cavitation bubble collapse is investigated using fluid and material dynamics and their interaction. In the fluid, a novel hybrid approach, which links a boundary element method and a compressible finite difference method, is used to capture non-spherical bubble dynamics and resulting liquid pressures efficiently and accurately. The bubble dynamics is intimately coupled with a finite-element structure model to enable fluid/structure interaction simulations. Bubble collapse loads the material with high impulsive pressures, which result from shock waves and bubble re-entrant jet direct impact on the material surface. The shock wave loading can be from the re-entrant jet impact on the opposite side of the bubble, the fast primary collapse of the bubble, and/or the collapse of the remaining bubble ring. This produces high stress waves, which propagate inside the material, cause deformation, and eventually failure. A permanent deformation or pit is formed when the local equivalent stresses exceed the material yield stress. The pressure loading depends on bubble dynamics parameters such as the size of the bubble at its maximum volume, the bubble standoff distance from the material wall and the pressure driving the bubble collapse. The effects of standoff and material type on the pressure loading and resulting pit formation are highlighted and the effects of bubble interaction on pressure loading and material deformation are preliminarily discussed.

show abstract

Section: Problem Descriptionmentioning

confidence: 99%

Modelling cavitation erosion using fluid–material interaction simulations

Chahine¹,

Hsiao²

2015

Interface Focus.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Generation of jets directed either toward or away from the wall, and maximum wall stress was observed to depend on the separation distance. If the surrounding liquid is assumed to be inviscid, incompressible, and irrotational, the boundary integral method can be used to simulate the asymmetric bubble response near rigid boundaries ͑Sato et Zhang et al, 1994;Krasovitski and Kimmel, 2001;Brujan et al, 2002;Tomita et al, 2002;andBrujan, 2004͒. Tomita et al ͑2002͒ reported that the curvature of the rigid boundary can significantly influence the collapse of a nearby laser-generated bubble, and predicted higher jet velocities for convex surfaces.…”

Section: Introductionmentioning

confidence: 98%

Ultrasonic excitation of a bubble near a rigid or deformable sphere: Implications for ultrasonically induced hemolysis

Gracewski

Miao

Dalecki

2005

The Journal of the Acoustical Society of America

View full text Add to dashboard Cite

A number of independent studies have reported increased ultrasound bioeffects, such as hemolysis and hemorrhage, when ultrasound contrast agents are present. To better understand the role of cavitation in these bioeffects, one- and two-dimensional models have been developed to investigate the interactions between ultrasonically excited bubbles and model "cells." First, a simple one-dimensional model based on the Rayleigh-Plesset equation was developed to estimate upper bounds for strain, strain rate, and areal expansion of a simulated red blood cell. Then, two-dimensional boundary element models were developed (with DynaFlow Inc.) to obtain simulations of asymmetric bubble dynamics in the presence of rigid and deformable spheres. The deformable spherical "cell" was modeled using Tait's equation of state for water, with a membrane approximated by surface tension that increases linearly with areal expansion. The presence of a rigid or deformable sphere had little effect on the bubble expansion, but caused an asymmetric collapse and jetting for the conditions considered. Predicted membrane areal expansions were found to be below critical values for hemolysis reported in the literature for the cases considered near the inertial cavitation threshold.

show abstract

“…From a historical perspective, interaction of cavitation bubble collapse with a nearby solid surface has been studied since 1970 [44] (see also the experimental works of Launterborn et al [45,46,47]). Along similar lines are the investigations of [48,49] on bubble deformation and collapse near a wall, employing the Boundary Element Method (BEM). This method is still being used for high fidelity bubble simulations [50] and interactions with deformable bodies [51,52].…”

Section: Models Suitable For Single-bubbles (Microscales)mentioning

confidence: 95%

Modelling cavitation during drop impact on solid surfaces

Kyriazis

Koukouvinis

Gavaises

2018

Advances in Colloid and Interface Science

View full text Add to dashboard Cite

The impact of liquid droplets on solid surfaces at conditions inducing cavitation inside their volume has rarely been addressed in the literature. A review is conducted on relevant studies, aiming to highlight the differences from non-cavitating impact cases. Focus is placed on the numerical models suitable for the simulation of droplet impact at such conditions. Further insight is given from the development of a purpose-built compressible two-phase flow solver that incorporates a phase-change model suitable for cavitation formation and collapse; thermodynamic closure is based on a barotropic Equation of State (EoS) representing the density and speed of sound of the co-existing liquid, gas and vapour phases as well as liquid-vapour mixture. To overcome the known problem of spurious oscillations occurring at the phase boundaries due to the rapid change in the acoustic impedance, a new hybrid numerical flux discretization scheme is proposed, based on approximate Riemann solvers; this is found to offer numerical stability and has allowed for simulations of cavitation formation during drop impact to be presented for the first time. Following a thorough justification of the validity of the model assumptions adopted for the cases of interest, numerical simulations are firstly compared against the Riemann problem, for which the exact solution has been derived for two materials with the same velocity and pressure fields. The model is validated against the single experimental data set available in the literature for a 2-D planar drop impact case. The results are found in good agreement against these data that depict the evolution of both the shock wave generated upon impact and the rarefaction waves, which are also captured reasonably well. Moreover, the location of cavitation formation inside the drop and the areas of possible erosion sites that may develop on the solid surface, are also well captured by the model. Following model validation, numerical experiments have examined the effect of impact conditions on the process, utilizing both planar and 2-D axisymmetric simulations. It is found that the absence of air between the drop and the wall at the initial configuration can generate cavitation regimes closer to the wall surface, which significantly increase the pressures induced on the solid wall surface, even for much lower impact velocities. A summary highlighting the open questions still remaining on the subject is given at the end.

show abstract

The behavior of a cavitation bubble near a rigid wall

Cited by 9 publications

References 8 publications

Modelling cavitation erosion using fluid–material interaction simulations

Modelling cavitation erosion using fluid–material interaction simulations

Ultrasonic excitation of a bubble near a rigid or deformable sphere: Implications for ultrasonically induced hemolysis

Modelling cavitation during drop impact on solid surfaces

Contact Info

Product

Resources

About