[PDF] Cavitation In Non Newtonian Fluids eBook

Author : Emil Brujan
Publisher : Springer Science & Business Media
Page : 274 pages
File Size : 31,74 MB
Release : 2010-09-28
Category : Technology & Engineering
ISBN : 3642153437

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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.

Author : Stuart Kayo Hara
Publisher :
Page : 187 pages
File Size : 17,79 MB
Release : 1983
Category :
ISBN :

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Flow cavitation is substantially altered, both at inception and during subsequent dynamics, by the addition of small amounts of water-soluble polymer. Theoretical and experimental single-bubble systems developed here trace the shape of a bubble as it is influenced by a volume change of the cavity, the rheology of the surrounding fluid, the presence of a solid wall, and/or an imposed external flow. The theoretical formulation pertains to a bubble in a fluid which is infinite in extent and contains no barriers or interfaces apart from the bubble surface. An external flow can be imposed, imparting a stress history. In addition, a spherical bubble profile, obtained from present experiments or theories, dictates a volume change and drives the non-sphericities. (Author).

Author : Jean-Pierre Franc
Publisher : Springer Science & Business Media
Page : 321 pages
File Size : 44,99 MB
Release : 2006-01-22
Category : Science
ISBN : 1402022336

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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.

Author : Jessica Redmon
Publisher :
Page : 114 pages
File Size : 46,41 MB
Release : 2019
Category : Bubbles
ISBN :

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Conditions for bubble cavitation and behavior in non-Newtonian fluids have numerous applications in physical sciences, engineering and medicine. Non-Newtonian fluids are a rich, but relatively undeveloped area of fluid dynamics, with phenomena from diffusion to bubble growth just beginning to receive attention. In the course of examining bubble cavitation, it became apparent that the random particle motion responsible for determining potential bubble formation had not been researched. As cavitation bubbles collapse, they deform into a variety of non-spherical shapes. Due to the complex dynamics and the radial focus of current equations on bubble behavior, no accepted model has yet emerged. This work explores the behavior using numerical methods on both fluid and bubble models to examine this system from different prospectives, culminating in a time-fractional, power-law Burger’s type equation showing bubble formation under these conditions.

Author : Albert T. Ellis
Publisher :
Page : 26 pages
File Size : 11,24 MB
Release : 1970
Category :
ISBN :

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Observations are presented which show that the stresses in a flow field of a very dilute polymer are not well enough described by the Navier-Stokes equations to accurately predict cavitation. The constitutive equation for the particular polymer and concentration used is needed. The second-order fluid form in which accelerations are relatively important appears capable of explaining observed cavitation suppression by changing the pressure field due to flow. Bubble dynamics in stationary dilute polymer solutions are also examined and found to be little different from those in water. (Author).

Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
Page : 74 pages
File Size : 32,95 MB
Release : 2018-07-08
Category :
ISBN : 9781722331405

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A review of the current research of cavitation in fluid films is presented. Phenomena and experimental observations include gaseous cavitation, vapor cavitation, and gas entrainment. Cavitation in flooded, starved, and dynamically loaded journal bearings, as well as squeeze films are reviewed. Observations of cavitation damage in bearings and the possibility of cavitation between parallel plates with microasperities were discussed. The transcavity fluid transport process, meniscus motion and geometry or form of the film during rupture, and reformation were summarized. Performance effects were related to heat transfer models in the cavitated region and hysteresis influence on rotor dynamics coefficients. A number of cavitation algorithms was presented together with solution procedures using the finite difference and finite element methods. Although Newtonian fluids were assumed in most of the discussions, the effect of non-Newtonian fluids on cavitation was also discussed. Brewe, D. E. (Editor) and Ball, J. H. (Editor) and Khonsari, M. M. (Editor) Glenn Research Center...

Author : William R. Schowalter
Publisher :
Page : 69 pages
File Size : 29,9 MB
Release : 1980
Category :
ISBN :

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A review of topics relevant to Newtonian and non-Newtonian bubble and droplet dynamics, together with an extensive bibliography, are presented. This review forms the basis for an assessment of theoretical and experimental studies of nonspherical bubble growth and collapse in non-Newtonian fluids. In the report, which is adapted from a proposition for a research dissertation, we show the difference between extremes of inertia-dominated and viscosity-dominated bubble dynamics under conditions of interest. Comparison with published data shows that the effect of inertia is expected to be important, even in non-Newtonian systems. Finally, the goals of the research are delineated, and possible theoretical and experimental approaches are outlined. (Author).

Author : Peter Stothe Kezios
Publisher :
Page : 177 pages
File Size : 32,98 MB
Release : 1984
Category :
ISBN :

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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.