The Collapsing Bubble
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The Collapsing Bubble
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Author : Lindsey Grant
language : en
Publisher:
Release Date : 2005
The Collapsing Bubble written by Lindsey Grant and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Energy policy categories.
A courageous look at the world's dwindling energy resources. Contending that the energy debate has been cast in the wrong terms, Grant suggests that the problem would not be solved by asking: "What energy sources will be available to replace fossil fuels?' but by questioning: "What populations can be supported at a decent standard by the energy sources that will be available after the transition from fossil fuels?' Taking a brave stand, Grant suggests that with a bit of luck-we may be able to create a more harmonious balance with the rest of the biosphere, but at much lower population levels and less consumptive habits.
Interaction Between A Collapsing Bubble And A Free Surface
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Author : Georges L.. Chahine
language : en
Publisher:
Release Date : 1976
Interaction Between A Collapsing Bubble And A Free Surface written by Georges L.. Chahine and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1976 with categories.
Nonlinear Interaction Between A Collapsing Bubble And A Structure
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Author : Tao Huang
language : en
Publisher:
Release Date : 1993
Nonlinear Interaction Between A Collapsing Bubble And A Structure written by Tao Huang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with categories.
The Relationship Between The Collapsing Cavitation Bubble And Its Microjet Near A Rigid Wall Under An Ultrasound Field
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Author : Ce Guo
language : en
Publisher:
Release Date : 2018
The Relationship Between The Collapsing Cavitation Bubble And Its Microjet Near A Rigid Wall Under An Ultrasound Field written by Ce Guo and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with Science categories.
Cavitation bubble collapse and its produced microjet on a solid wall are very important for the application of ultrasound. However, the prediction and control of microjets have been a very challenging work due to the complicated mechanisms of the collapsing of cavitation bubbles under the ultrasonic field. In order to determine the interaction of the microjet with the key parameters that influence the acoustic cavitation, the dynamics of bubble growth and collapse near a rigid boundary in water are investigated. Numerical simulations of the motion characteristics and collapsed velocities of a bubble near a rigid boundary and a free boundary have been performed. Compared with the free boundary, the rigid boundary has an inhibition effect for ultrasonic cavitation. The velocity of the bubble collapse under the rigid boundary is decreased as the increase of the initial bubble radius and ultrasonic frequency and rises with the increase of the distance from the bubble to the solid wall. There is the optimal acoustic pressure at which ultrasonic cavitation effect near the rigid boundary is most violent. The relationship between the velocity of the bubble collapse and its microjet near a rigid boundary is finally described.
Direct Numerical Simulations Of Nucleation And Collapse Of Bubbles Attached To Walls
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Author : Mandeep Saini
language : en
Publisher:
Release Date : 2022
Direct Numerical Simulations Of Nucleation And Collapse Of Bubbles Attached To Walls written by Mandeep Saini and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with categories.
Cavitation bubbles appear in numerous applications in several disciplines, yet the interaction between the cavitation bubbles and their surroundings is not well understood. In this work, we comprehensively study the process of nucleation and collapse of bubbles in contact with rigid wall that leads to complex interaction between the bubble, the wall and the surrounding media. We focus on the heterogeneous nucleation where the bubbles are known to generate from the small unstable gas nuclei that can be trapped in the solid impurities. We assume that these nuclei have spherical cap shape and examine their stability using the quasi-static theory in the limiting conditions of contact line motion i.e. pinning and free movement. We show that the stability of bubbles depend on the behavior of three-phase contact line and that the pinning effect stabilizes the gas nuclei. We use direct numerical simulations with Navier-slip model to study the dynamics of nucleating bubbles and to resolve the visco-capillary effects close to the wall. The numerical simulations reveal that the growth of microlayer takes an asymptotic value in the limit of large capillary numbers (of order one) for Ohnesorge numbers much smaller than unity. Interestingly, the aymptotic value of non-dimensional contact line velocity varies with the cube of contact angle which is in accordance with the Cox-Voinov theory. In the second part, we focus on the characterization of the collapse of spherical cap shaped bubbles. We show that the dynamic response of a spherical cap bubble in contact with a rigid wall depends on the effective contact angle at the instant prior to collapse. This parameter allows us to discriminate between two regimes in which the mechanisms of interaction between the collapsing bubble and its surrounding medium differ markedly: When the contact angle is smaller than 90 degrees a classical jet directed towards the wall is observed whereas if the initial contact angle is larger than 90 degrees an annular re-entrant jet parallel to the wall appears. We show that this change of behavior can be explained using the impulse potential flow theory for small times which shows the presence of a singularity on the initial acceleration of contact line when the contact angle is larger then 90 degrees. In some circumstances, numerical and experimental results show that the collapse of flat bubbles can eventually lead to the formation of a vortex ring that unexpectedly induces long-range effects. We use this equation to characterize the kinetic energy of liquid jets formed during the non-spherical collapse of bubbles in contact with the rigid wall. Depending upon the bubble shape, some amount of this kinetic energy can remain residual in the liquid bulk at the instant of minimum volume and therefore penalizes the maximum gas pressure at this instant. We show that the penalization effect due to bubble shape becomes increasingly important as the pressure difference driving the collapse increases. In the last part, we study the problem of multiple cavitation bubbles nucleating and collapsing in the contact with a rigid wall. We discuss the asymmetry caused by the pressure pulse as a function of speed of sound in the liquid phase. We hypothesize that the asymmetry is caused by the finite speed of sound effects which result from the fact that the tiny bubble fragments remain inside the liquid bulk in the subsequent cavitation experiments. These results can find direct application in the control and optimization of techniques based on the cavitation as well as understanding of naturally occurring phenomenon where cavitation bubbles appear.
Hydrodynamics Of Jet Impact In A Collapsing Bubble
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Author : Antony Pearson
language : en
Publisher:
Release Date : 2002
Hydrodynamics Of Jet Impact In A Collapsing Bubble written by Antony Pearson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with categories.
Oscillation And Collapse Of A Cavitation Bubble In The Vicinity Of A Two Liquid Interface
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Author : G. L. Chahine
language : en
Publisher:
Release Date : 1979
Oscillation And Collapse Of A Cavitation Bubble In The Vicinity Of A Two Liquid Interface written by G. L. Chahine and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with Bubbles categories.