Download or read book An Investigation Into the Effects of Viscoelasticity on Cavitation Bubble Dynamics with Applications to Biomedicine written by Michael Jason Walters and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Investigation Into the Effects of Viscoelasticity on Cavitation Bubble Dynamics with Applications to Biomedicine written by Michael Walters and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cavitation in Non Newtonian Fluids written by Emil Brujan and published by Springer Science & Business Media. This book was released on 2010-09-28 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: Non-Newtonian properties on bubble dynamics and cavitation are fundamentally different from those of Newtonian fluids. The most significant effect arises from the dramatic increase in viscosity of polymer solutions in an extensional flow, such as that generated about a spherical bubble during its growth or collapse phase. In addition, many biological fluids, such as blood, synovial fluid, and saliva, have non-Newtonian properties and can display significant viscoelastic behaviour. This monograph elucidates general aspects of bubble dynamics and cavitation in non-Newtonian fluids and applies them to the fields of biomedicine and bioengineering. In addition it presents many examples from the process industries. The field is strongly interdisciplinary and the numerous disciplines involve have and will continue to overlook and reinvent each others’ work. This book helps researchers to think intuitively about the diverse physics of these systems, to attempt to bridge the various communities involved, and to convey the interest, elegance, and variety of physical phenomena that manifest themselves on the micrometer and microsecond scales.
Download or read book A Numerical Study of the Effect of Viscoelasticity on Cavitation and Bubble Dynamics written by Steven John Lind and published by . This book was released on 2010 with total page 572 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Cavitation and Bubble Dynamics written by Phoevos Koukouvinis and published by Elsevier. This book was released on 2021-09-24 with total page 355 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cavitation and Bubble Dynamics: Fundamentals and Applications examines the latest advances in the field of cavitation and multiphase flows, including associated effects such as material erosion and spray instabilities. This book tackles the challenges of cavitation hindrance in the industrial world, while also drawing on interdisciplinary research to inform academic audiences on the latest advances in the fundamentals. Contributions to the book come from a wide range of specialists in areas including fuel systems, hydropower, marine engineering, multiphase flows and computational fluid mechanics, allowing readers to discover novel interdisciplinary experimentation techniques and research results. This book will be an essential tool for industry professionals and researchers working on applications where cavitation hindrance affects reliability, noise, and vibrations. Covers a wide range of cavitation and bubble dynamics phenomena, including shock wave emission, jetting, and luminescence Provides the latest advice about applications including cavitation tunnels, cavitation testing, flow designs to avoid cavitation in pumps and other hydromachinery, and flow lines Describes novel experimental techniques, such as x-ray imaging and new computational techniques
Download or read book Cavitation in Biomedicine written by Mingxi Wan and published by Springer. This book was released on 2015-08-29 with total page 516 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book offers a systematic introduction to the engineering principles and techniques of cavitation in biomedicine on the basis of its physics and mechanism. Adopting an interdisciplinary approach, it covers areas of interest ranging from physics and engineering to the biological and medical sciences. Individual chapters introduce the fundamentals of cavitation, describe its characterization, control and imaging techniques, and present cavitation-enhanced thermal and mechanical effects and their applications. Intended as both a reference work for graduate students, and as a guide for scientists and engineers who work with cavitation in biomedicine, it provides a broad and solid foundation of knowledge. The aim is to bridge the different disciplines involved, and to promote cross-discipline research, thus encouraging innovations in the scientific research and engineering applications alike. Dr. Mingxi Wan is a professor at Department of Biomedical Engineering, Xi’an Jiao Tong University, Xi’an, Shaanxi, China; Dr. Yi Feng works at Department of Biomedical Engineering, Xi’an Jiao Tong University, Xi’an, Shaanxi, China; Dr. Gail ter Haar is a professor at The Institute of Cancer Research, Sutton, Surry, UK.
Download or read book Unraveling the Mechanics of Cavitation Applications in Biomedical Treatments written by Nimra and published by . This book was released on 2024-06-11 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bubble Dynamics in Polymer Solutions Undergoing Shear written by Peter Stothe Kezios and published by . This book was released on 1984 with total page 177 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hydraulic cavitation and its effects have been reported to be substantially inhibited and subsequently suppressed by the addition of minute quantities of water-soluble polymer. Modelling the growth and collapse of a single cavitation bubble in water has been established as the fundamental theoretical approach to understanding this phenomenon. Laser-induced cavitation has been developed as a technique for the experimental investigation and confirmation of predicted spherical and nonspherical bubble dynamics in quiescent viscous fluids. The present experimental research has sought to form a link between previous theoretical and experimental efforts. Optical cavitation has been used to create model cavitation bubbles nonintrusively within a fluid undergoing a steady shear flow history. The flow-induced deformation of these single bubbles was recorded and analyzed. Originator supplied keywords include: cavitation, rheology, non-Newtonian fluid mechanics, bubbles, nonspherical, viscoelastic liquids, polymers.
Download or read book Some compressibility Effects in cavitation bubble dynamics written by Arthur John Rudolph Schneider and published by . This book was released on 1949 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bubble Dynamics Research Theory Instrumentation Results written by Frederick G. Hammitt and published by . This book was released on 1972 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Perturbation Effects in Cavitation Bubble Dynamics written by Maurice Rattray and published by . This book was released on 1951 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experimental and Theoretical Study on Cavitation Inception and Bubbly Flow Dynamics Part 1 Design Development and Operation of a Cavitation Susceptibility Meter Part 2 Linearized Dynamics of Bubbly and Cavitating Flows with Bubble Dynamics Effects written by Luca D'Agostino and published by . This book was released on 1987 with total page 325 pages. Available in PDF, EPUB and Kindle. Book excerpt: This theses presents the design, development and operations of a Cavitation Susceptibility Meter based on the use of a venturi tube for the measurement of the content of active cavitation nuclei in water samples. The pressure at the venturi throat is determined from the upstream pressure and the local flow velocity without corrections for viscous effects because the flow possesses a laminar potential core in all operational conditions. The detection ov cavitation and the measurement of the flow velocity are carried out optically. The apparatus comprises a Laser Doppler Velocimeter for the measurement of the flow velocity and the detection of cavitation, a custom-made electronic Signal Processor for real time generation and temporary storage of the data and a computerized system for the final acquisition and reduction of the collected data. The results of application of the Cavitation Susceptibility Meter to the measurement of the water quality of the tap water samples are presented. The results of an investigation are presented on the linearized dynamics of two-phase bubbly flows with the inclusion of bubble dynamics effects. Two flow configurations have been studied: the time dependent one-dimensional flow of a spherical bubble cloud subject to harmonic excitation of the far field external pressure and the steady state two-dimensional flow of a bubbly mixture on a slender profile of arbitrary shape.
Download or read book What We Learned from Cavitation Bubbles in Microgravity written by Mohamed Farhat and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The present chapter is about the Flash and Splash project, which is dedicated to the study of bubble dynamics in microgravity. The story of this project started in 2004 with a simple curiosity on how a cavitation bubble may behave within a water drop and evolved into an outstanding, internationally renowned science project as well as a wonderful human adventure. So far, we have participated in nine European Space Agency (ESA) parabolic flight campaigns (PFC) and made a significant progress in understanding the cavitation phenomenon. First, we investigated the dynamics of a cavitation bubble within a water drop and learned how the collapse may lead to the formation of a double jet. We discovered the formation of secondary cavitation due to the confinement of shockwaves within the drop. We used this result to propose a new path for erosion due to a high-speed impact of water drops on a solid surface. Then, we addressed the effect of gravity on bubble dynamics and came up with a unified framework to explain and predict key phenomena, such as microjets, shockwaves and luminescence. Parabolic flights gave us the unique opportunity to modulate the gravity-induced pressure gradient, which is crucial for the fate of a collapsing bubble.
Download or read book Cavitation and Bubble Dynamics written by Christopher Earls Brennen and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "Cavitation and Bubble Dynamics deals with the fundamental physical processes of bubble dynamics and the phenomenon of cavitation. It is ideal for graduate students and research engineers and scientists, and a basic knowledge of fluid flow and heat transfer is assumed. The analytical methods presented are developed from basic principles. The book begins with a chapter on nucleation and describes both the theory and observations in flowing and non-flowing systems. Three chapters provide a systematic treatment of the dynamics and growth, collapse, or oscillation of individual bubbles in otherwise quiescent fluids. The following chapters summarize the motion of bubbles in liquids, describe some of the phenomena that occur in homogeneous bubbly flows, with emphasis on cloud cavitation, and summarize some of the experimental observations of cavitating flows. The last chapter provides a review of free streamline methods used to treat separated cavity flows with large attached cavities"--
Download or read book Chapter What We Learned from Cavitation Bubbles in Microgravity written by Mohamed Farhat and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The present chapter is about the Flash and Splash project, which is dedicated to the study of bubble dynamics in microgravity. The story of this project started in 2004 with a simple curiosity on how a cavitation bubble may behave within a water drop and evolved into an outstanding, internationally renowned science project as well as a wonderful human adventure. So far, we have participated in nine European Space Agency (ESA) parabolic flight campaigns (PFC) and made a significant progress in understanding the cavitation phenomenon. First, we investigated the dynamics of a cavitation bubble within a water drop and learned how the collapse may lead to the formation of a double jet. We discovered the formation of secondary cavitation due to the confinement of shockwaves within the drop. We used this result to propose a new path for erosion due to a high-speed impact of water drops on a solid surface. Then, we addressed the effect of gravity on bubble dynamics and came up with a unified framework to explain and predict key phenomena, such as microjets, shockwaves and luminescence. Parabolic flights gave us the unique opportunity to modulate the gravity-induced pressure gradient, which is crucial for the fate of a collapsing bubble.
Download or read book Cavitation and Bubble Dynamics written by Christopher Earl Brennen and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This monograph studies the problem of cavitation - the formation of bubbles in a liquid or gas. Cavitation is an interdisciplinary field of fluid dynamics and involves the basic structure of liquids and liquid-gas solutions, and the phase changes between them.
Download or read book Cloud Cavitation and Collective Bubble Dynamics written by Georges L. Chahine and published by . This book was released on 1986 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study described in this report extends our knowledge of single bubble dynamics to multibubble dynamics. Within the restriction of characteristic bubble size small compared to interbubble distance, the dynamics of a bubble cloud is investigated. Dynamic effects in absence as well as in presence of heat and mass transfer at the bubble wall are considered. The matched asymptotic expansion method is used and enables derivation of differential equations for the bubble shape components at the various orders of approximation. These were solved numerically and the pressure field was deduced. When, during a significant portion of the imposed pressure field history, the liquid is superheated or gas supersaturated, heat and mass transfer at the interface interfere with the dynamics of the bubble growth or oscillations. In that case, the dynamic equation of a bubble in the cloud is coupled to the heat or mass transfer equation by the value of the partial pressures of the liquid vapor and noncondensible gas inside the bubble which are then transfer dependent. This problem is solved when the liquid properties or conditions are such that the variation of the liquid temperature of the gas concentration in the liquid occurs primarily in a thin boundary layer at the bubble wall. In that case an integral equation relates bubble dynamics and heat or mass transfer at the bubble interface.
