Experimental And Numerical Investigation Of Damage On An Aluminum Surface By Single Bubble Cavitation
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Experimental And Numerical Investigation Of Damage On An Aluminum Surface By Single Bubble Cavitation
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Author : Hemant J. Sagar
language : en
Publisher:
Release Date : 2018
Experimental And Numerical Investigation Of Damage On An Aluminum Surface By Single Bubble Cavitation written by Hemant J. Sagar and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with Cavitation categories.
For a better understanding and modeling of cavitation, investigations of isolated single-bubble events are useful. They allow for describing and quantifying the physics of the bubble collapse and its interaction with surrounding material. The generation of such single bubbles in a liquid using an electric spark or focused laser beam is well described in the literature, and sophisticated analyses of bubble dynamics near surfaces exist. However, only a few studies addressed the material damage induced by single-bubble collapse. This article presents experiments in water, generating single bubbles with 3-mm diameters at various defined distances to the polished surface of a commercially pure aluminum specimen. The collapse of each laser-induced bubble was captured by high-speed imaging. A detailed quantitative analysis of the surface damage was performed using 3-D profilometry. A single bubble created a shallow pit with a typical depth of 1 to 2 ?m. The overall statistics of the damage parameters, such as pit depth and volume, are consistent with previous investigations. Outliers with unusually small or multiple pits can be explained by the high-speed images of the corresponding bubble collapse. The image sequences also help identify effects of the edge of the specimen surface. In addition, a complementary numerical investigation of single bubbles based on the Navier-Stokes equations was used to obtain flow characteristics near the surface, such as microjet impact and pressure. For the commercially pure aluminum used in this study, simulation and measured surface damage correlate well. The methods developed here provide a basis for studies on more complex engineering materials.
Numerical And Experimental Investigation Of Laser Induced Cavitation Bubbles And Induced Damage
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Author : Hemant J. Sagar
language : en
Publisher:
Release Date : 2018
Numerical And Experimental Investigation Of Laser Induced Cavitation Bubbles And Induced Damage written by Hemant J. Sagar and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with categories.
Experimental And Numerical Investigations Of The Sheet Hydraulic Bulge Test For Aluminum Alloys
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Author : Shreyas Chitta Nagaraj
language : en
Publisher:
Release Date : 2005
Experimental And Numerical Investigations Of The Sheet Hydraulic Bulge Test For Aluminum Alloys written by Shreyas Chitta Nagaraj and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Aluminum alloys categories.
An Experimental And Numerical Investigation Of Pressure Shear Waves In 6061 T6 Aluminum And Alpha Titanium
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Author : Amos Gilat
language : en
Publisher:
Release Date : 1983
An Experimental And Numerical Investigation Of Pressure Shear Waves In 6061 T6 Aluminum And Alpha Titanium written by Amos Gilat and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 with Aluminum categories.
On Modeling Cavitation Damage
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Author : A. Thiruvengadam
language : en
Publisher:
Release Date : 1966
On Modeling Cavitation Damage written by A. Thiruvengadam and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1966 with Cavitation categories.
The intensity of bubble collapse is defined as the power transmitted per unit surface area of the bubble when the collapse pressure is a maximum and is given by the square of the collapse pressure divided by the acoustic impedence of the liquid. The efficiency of damage is defined as the ratio of the intensity of erosion of the material to the intensity of bubble collapse. Quantitative analysis is made to show how this efficiency would be affected by various physical effects such as inertia, damping of gas and vapor inside the bubble, heat transfer, compressibility, surface tension and viscosity. Experimental results with vibratory apparatus show that the efficiency of damage is primarily controlled by the damping of non-condensible gases and vapor. At higher temperature viscosity also seems to be important. Within the range of experiments, surface tension of the liquids tested seems to be unimportant. The group of non-dimensional numbers derived from the above analysis as used to formulate a modeling technique to predict the rate of depth of erosion in actual operating hydrodynamic systems. (Author).
Numerical And Photographic Studies Of Asymmetric Bubble Collapse
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Author : T. M. Mitchell
language : en
Publisher:
Release Date : 1967
Numerical And Photographic Studies Of Asymmetric Bubble Collapse written by T. M. Mitchell and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1967 with categories.
Recent investigations of the fundamental aspect of cavitation damage have indicated the importance of asymmetric bubble collapse. This investigation is an effort to theoretically and experimentally justify the role of asymmetric bubble collapse in cavitation damage. The theoretical investigation employs a combined Eulerian and Lagrangian computer code capable of following the collapse of a bubble much further than previous perturbation techniques. The experimental investigation is concerned with the development of a specialized spark camera with a maximum framing rate of 1,000,000 frames per second and a spatial resolution higher than any other camera presently available at this laboratory. (Author).
Laser Cavitation Bubbles At Objects Merging Numerical And Experimental Methods
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Author : Max Koch
language : en
Publisher:
Release Date : 2020
Laser Cavitation Bubbles At Objects Merging Numerical And Experimental Methods written by Max Koch and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with categories.
The main body of this thesis deals with the existence of the so called fast jet that develops when a single, laser generated cavitation bubble expands and collapses close to a flat, solid boundary at normalised distances [0, 0.2]. One reason for this focus is that even after 100 years of research on cavitation erosion, the precise mechanism of damage of hardest materials by cavitation bubbles still is not fully clear. In this thesis it is shown that exactly in the range of normalized distance [0, 0.3] the main pressure peak takes place in the symmetry point at the solid boundary below the b...
Fundamentals Of Cavitation
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Author : Jean-Pierre Franc
language : en
Publisher: Springer Science & Business Media
Release Date : 2006-01-22
Fundamentals Of Cavitation written by Jean-Pierre Franc and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006-01-22 with Science categories.
This book treats cavitation, which is a unique phenomenon in the field of hyd- dynamics, although it can occur in any hydraulic machinery such as pumps, propellers, artificial hearts, and so forth. Cavitation is generated not only in water, but also in any kind of fluid, such as liquid hydrogen. The generation of cavitation can cause severe damage in hydraulic machinery. Therefore, the prevention of cavitation is an important concern for designers of hydraulic machinery. On the contrary, there is great potential to utilize cavitation in various important applications, such as environmental protection. There have been several books published on cavitation, including one by the same authors. This book differs from those previous ones, in that it is both more physical and more theoretical. Any theoretical explanation of the cavitation phenomenon is rather difficult, but the authors have succeeded in explaining it very well, and a reader can follow the equations easily. It is an advantage in reading this book to have some understanding of the physics of cavitation. Therefore, this book is not an introductory text, but a book for more advanced study. However, this does not mean that this book is too difficult for a beginner, because it explains the cavitation phenomenon using many figures. Therefore, even a beginner on cavitation can read and can understand what cavitation is. If the student studies through this book (with patience), he or she can become an expert on the physics of cavitation.
Cavitation And Bubble Dynamics
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Author : Christopher E. Brennen
language : en
Publisher: Cambridge University Press
Release Date : 2014
Cavitation And Bubble Dynamics written by Christopher E. Brennen and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with Mathematics categories.
Cavitation and Bubble Dynamics deals with fundamental physical processes of bubble dynamics and cavitation for graduate students and researchers.
Constitutive Models For Rubber Ix
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Author : Bohdana Marvalova
language : en
Publisher: CRC Press
Release Date : 2015-10-22
Constitutive Models For Rubber Ix written by Bohdana Marvalova and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-10-22 with Science categories.
The unique properties of rubber make it ideal for use in a wide variety of engineering applications such as tyres, engine mounts, shock absorbers, flexible joints and seals. Developing diverse elastomeric elements for various structures involves numerical simulations of their performance, which are based on reliable constitutive models of the mater