Temperature Effects on Single Bubble Collapse and Induced Impulsive Pressure

1988 ◽  
Vol 110 (2) ◽  
pp. 194-199 ◽  
Author(s):  
A. Shima ◽  
Y. Tomita ◽  
T. Ohno
Keyword(s):  
Water Temperature ◽  
Temperature Effect ◽  
High Speed ◽  
Solid Wall ◽  
Saturated Vapor ◽  
Single Bubble ◽  
Bubble Collapse ◽  
Cavitation Damage ◽  
Wide Range ◽  
Impulsive Pressure

In relation to the temperature effect in cavitation damage, the collapse of a single bubble in water over a wide range of temperatures was experimentally studied. A spark-induced bubble was observed by using a high speed camera and the impulsive pressure caused by the bubble collapse was measured by means of a pressure transducer. As water temperature increases, the motion of a bubble tends to weaken owing to the increase in saturated vapor pressure of water, and the surface configuration of a bubble becomes highly irregular because of thermal instability. The impulsive pressure depends not only on the bubble size and its distance from a solid wall but also on the water temperature. When the water temperature approaches the boiling point of water, the impulsive pressure abruptly decreases with increasing water temperature. The evidence obtained seems to be associated with the known temperature effect on cavitation damage at high water temperature.

scholarly journals Cavitation and bubble dynamics: the Kelvin impulse and its applications

2015 ◽  
Vol 5 (5) ◽  
pp. 20150017 ◽  
Author(s):  
John R. Blake ◽  
David M. Leppinen ◽  
Qianxi Wang
Keyword(s):  
Cavitation Bubble ◽  
High Speed ◽  
Bubble Dynamics ◽  
Clinical Medicine ◽  
Bubble Collapse ◽  
Rigid Boundary ◽  
Design Problems ◽  
Practical Applications ◽  
Wide Range ◽  
Naval Engineering

Cavitation and bubble dynamics have a wide range of practical applications in a range of disciplines, including hydraulic, mechanical and naval engineering, oil exploration, clinical medicine and sonochemistry. However, this paper focuses on how a fundamental concept, the Kelvin impulse, can provide practical insights into engineering and industrial design problems. The pathway is provided through physical insight, idealized experiments and enhancing the accuracy and interpretation of the computation. In 1966, Benjamin and Ellis made a number of important statements relating to the use of the Kelvin impulse in cavitation and bubble dynamics, one of these being ‘One should always reason in terms of the Kelvin impulse, not in terms of the fluid momentum…’. We revisit part of this paper, developing the Kelvin impulse from first principles, using it, not only as a check on advanced computations (for which it was first used!), but also to provide greater physical insights into cavitation bubble dynamics near boundaries (rigid, potential free surface, two-fluid interface, flexible surface and axisymmetric stagnation point flow) and to provide predictions on different types of bubble collapse behaviour, later compared against experiments. The paper concludes with two recent studies involving (i) the direction of the jet formation in a cavitation bubble close to a rigid boundary in the presence of high-intensity ultrasound propagated parallel to the surface and (ii) the study of a ‘paradigm bubble model’ for the collapse of a translating spherical bubble, sometimes leading to a constant velocity high-speed jet, known as the Longuet-Higgins jet.

Numerical study of the shock wave and pressure induced by single bubble collapse near planar solid wall

2021 ◽  
Vol 33 (7) ◽  
pp. 073311
Author(s):  
Xiaobin Yang ◽  
Cheng Liu ◽  
Decheng Wan ◽  
Changhong Hu
Keyword(s):  
Shock Wave ◽  
Numerical Study ◽  
Solid Wall ◽  
Single Bubble ◽  
Bubble Collapse

scholarly journals A ctenophore (comb jelly) employs vortex rebound dynamics and outperforms other gelatinous swimmers

2019 ◽  
Vol 6 (3) ◽  
pp. 181615 ◽  
Author(s):  
Brad J. Gemmell ◽  
Sean P. Colin ◽  
John H. Costello ◽  
Kelly R. Sutherland
Keyword(s):  
High Speed ◽  
Particle Image ◽  
Solid Wall ◽  
Fluid Dynamic ◽  
Propulsion Systems ◽  
Vortex Interactions ◽  
Image Velocimetry ◽  
Wide Range ◽  
Rebound Phenomenon ◽  
Propulsive Mechanism

Gelatinous zooplankton exhibit a wide range of propulsive swimming modes. One of the most energetically efficient is the rowing behaviour exhibited by many species of schyphomedusae, which employ vortex interactions to achieve this result. Ctenophores (comb jellies) typically use a slow swimming, cilia-based mode of propulsion. However, species within the genus Ocyropsis have developed an additional propulsive strategy of rowing the lobes, which are normally used for feeding, in order to rapidly escape from predators. In this study, we used high-speed digital particle image velocimetry to examine the kinematics and fluid dynamics of this rarely studied propulsive mechanism. This mechanism allows Ocyropsis to achieve size-adjusted speeds that are nearly double those of other large gelatinous swimmers. The investigation of the fluid dynamic basis of this escape mode reveals novel vortex interactions that have not previously been described for other biological propulsion systems. The arrangement of vortices during escape swimming produces a similar configuration and impact as that of the well-studied ‘vortex rebound’ phenomenon which occurs when a vortex ring approaches a solid wall. These results extend our understanding of how animals use vortex–vortex interactions and provide important insights that can inform the bioinspired engineering of propulsion systems.

scholarly journals Collapse of an initially spherical vapour cavity in the neighbourhood of a solid boundary

1971 ◽  
Vol 47 (2) ◽  
pp. 283-290 ◽  
Author(s):  
Milton S. Plesset ◽  
Richard B. Chapman
Keyword(s):  
Solid Wall ◽  
Bubble Collapse ◽  
Solid Boundary ◽  
Liquid Pressure ◽  
Cavitation Damage ◽  
First Case ◽  
Spherical Bubbles ◽  
Compressibility Effects ◽  
Jet Velocities ◽  
Density Of Water

Vapour bubble collapse problems lacking spherical symmetry are solved here using a numerical method designed especially for these problems. Viscosity and compressibility in the liquid are neglected. Two specific cases of initially spherical bubbles collapsing near a plane solid wall were simulated: a bubble initially in contact with the wall, and a bubble initially half its radius from the wall at the closest point. It is shown that the bubble develops a jet directed towards the wall rather early in the collapse history. Free surface shapes and velocities are presented at various stages in the collapse. Velocities are scaled like (Δp/ρ)½ where ρ is the density of the liquid and Δp is the constant difference between the ambient liquid pressure and the pressure in the cavity. For \[ \Delta p/\rho = 10^6 {\rm cm}^2/\sec^2 \approx 1\, \hbox{atm/density of water} \] the jet had a speed of about 130m/sec in the first case and 170m/sec in the second when it struck the opposite side of the bubble. Such jet velocities are of a magnitude which can explain cavitation damage. The jet develops so early in the bubble collapse history that compressibility effects in the liquid and the vapour are not important.

The Collapse of a Gas Bubble near a Solid Wall by a Shock Wave and the Induced Impulsive Pressure

1984 ◽  
Vol 198 (2) ◽  
pp. 81-86 ◽  
Author(s):  
A Shima ◽  
Y. Tomita ◽  
K Takahashi
Keyword(s):  
Shock Wave ◽  
Experimental Study ◽  
Cavitation Bubble ◽  
Solid Wall ◽  
Impact Pressure ◽  
Bubble Collapse ◽  
Gas Bubble ◽  
Bubble Interaction ◽  
The Impact ◽  
Impulsive Pressure

An experimental study concerning the shock wave—bubble interaction was conducted in order to obtain a unified consideration of the mechanism of the impulsive pressure generation induced by the cavitation bubble collapse. It was found that the relation between the maximum impulsive pressure, pG, max, and the relative distance, lc/Re, is closely similar to the known result obtained from a single spark-generated bubble, and that a gas bubble within the region of lc/Re ≤ 7 behaves as a source capable of generating more intensive impulsive pressure than the impact pressure induced by a shock wave impinging directly on a solid wall without the presence of a gas bubble.

The Drag Coefficient and the Shape for a Single Bubble Rising in Non-Newtonian Fluids

2012 ◽  
Vol 134 (8) ◽  
Author(s):  
Shaobai Li ◽  
Youguang Ma ◽  
Shaokun Jiang ◽  
Taotao Fu ◽  
Chunying Zhu ◽  
...  
Keyword(s):  
Drag Coefficient ◽  
High Speed ◽  
Newtonian Fluids ◽  
Single Bubble ◽  
Dynamical Characteristic ◽  
Wide Range ◽  
Coefficient Corrélation ◽  
Deformed Bubble ◽  
Bubble Rising ◽  
Experimental Values

The dynamical characteristic of a single bubble rising in non-Newtonian fluid was investigated experimentally. The bubble aspect ratio and rising velocity were measured by high speed camera. The shape regimes for bubbles in non-Newtonian fluids was plotted by means of Reynolds number Re, Eötvös number Eo and Morton number Mo. The effects of bubble shape and liquid rheological property on the total bubble drag coefficient were studied. A new empirical drag coefficient correlation covering spherical bubble and deformed bubble was proposed, the predicted results shows good conformity to experimental values over a wide range of 0.05 < Re < 300.

scholarly journals Retardant Effects of Collapsing Dynamics of a Laser-Induced Cavitation Bubble Near a Solid Wall

Symmetry ◽  
2019 ◽  
Vol 11 (8) ◽  
pp. 1051
Author(s):  
Li ◽  
Duan ◽  
Zhang ◽  
Tang ◽  
Zhang
Keyword(s):  
Data Analysis ◽  
Cavitation Bubble ◽  
High Speed ◽  
Solid Wall ◽  
Bubble Collapse ◽  
High Speed Photography ◽  
Bubble Wall ◽  
Interface Evolution ◽  
Wall Distance ◽  
Dramatic Difference

In the present paper, the dynamic behavior of cavitation bubbles near a wall is experimentally investigated with a focus on the retardant effects of the wall on the collapsing dynamics of the bubble. In the present experiments, a cavitation bubble is generated by a focused laser beam with its behavior recorded through high-speed photography. During the data analysis, the influences of non-dimensional bubble–wall distance on the bubble collapsing dynamics are qualitatively and quantitatively investigated in terms of the interface evolution, the velocities of the poles, and the movement of the bubble centroid. Our results reveal that the presence of the wall could significantly affect the collapsing characteristics, leading to a dramatic difference between the moving velocities of interfaces near and away from the wall. With the decrease of the bubble–wall distance, the effects will be gradually strengthened with a rapid movement of the bubble centroid during the final collapse. Finally, a physical interpretation of the phenomenon is given based on the bubble theory, together with a rough estimation of the induced water hammer pressure by the bubble collapse.

Two Aspects of Cavitation Damage in the Incubation Zone: Scaling by Energy Considerations and Leading Edge Damage

1980 ◽  
Vol 102 (4) ◽  
pp. 481-485 ◽  
Author(s):  
D. R. Stinebring ◽  
J. William Holl ◽  
Roger E. A. Arndt
Keyword(s):  
Damage Zone ◽  
Pressure Rise ◽  
Leading Edge ◽  
Bubble Collapse ◽  
Test Model ◽  
Cavitation Damage ◽  
Pit Formation ◽  
Rate Versus ◽  
Wide Range ◽  
Edge Damage

This study focused on two aspects of the cavitation damage problem, namely an energy approach to the scaling of cavitation damage in the incubation zone and damage near the leading edge of a test model. The damage to the surface of the models was in the form of small indentations in which no material was removed. For a wide range of velocities namely 14.9 to 59.3 m/s the rate of pit formation per unit area in the maximum damage zone increased by the sixth power of velocity. Furthermore it is shown that the damage rate versus velocity data are in good agreement with three other investigations. The volumes of the pits were found to increase by the fifth power of velocity. A relationship between the volume of a pit and the cavitation bubble collapse energy absorbed was developed. The damage to the leading edge was felt to be due to the reentrant jet striking the leading edge of the cavity creating a short term pressure rise causing the collapse of any cavitation bubbles in this area.

Sign in / Sign up

Export Citation Format

Share Document