Download or read book Non continuum Shear Flow in a Centifugal Field written by Gerald C. Pomraning and published by . This book was released on 1963 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Physics of Transitional Shear Flows written by Andrey V. Boiko and published by Springer Science & Business Media. This book was released on 2011-09-15 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt: Starting from fundamentals of classical stability theory, an overview is given of the transition phenomena in subsonic, wall-bounded shear flows. At first, the consideration focuses on elementary small-amplitude velocity perturbations of laminar shear layers, i.e. instability waves, in the simplest canonical configurations of a plane channel flow and a flat-plate boundary layer. Then the linear stability problem is expanded to include the effects of pressure gradients, flow curvature, boundary-layer separation, wall compliance, etc. related to applications. Beyond the amplification of instability waves is the non-modal growth of local stationary and non-stationary shear flow perturbations which are discussed as well. The volume continues with the key aspect of the transition process, that is, receptivity of convectively unstable shear layers to external perturbations, summarizing main paths of the excitation of laminar flow disturbances. The remainder of the book addresses the instability phenomena found at late stages of transition. These include secondary instabilities and nonlinear features of boundary-layer perturbations that lead to the final breakdown to turbulence. Thus, the reader is provided with a step-by-step approach that covers the milestones and recent advances in the laminar-turbulent transition. Special aspects of instability and transition are discussed through the book and are intended for research scientists, while the main target of the book is the student in the fundamentals of fluid mechanics. Computational guides, recommended exercises, and PowerPoint multimedia notes based on results of real scientific experiments supplement the monograph. These are especially helpful for the neophyte to obtain a solid foundation in hydrodynamic stability. To access the supplementary material go to extras.springer.com and type in the ISBN for this volume.
Download or read book Future Directions in Polymer Colloids written by Mohamed S. El-Aasser and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt: Future Directions In Polymer Colloids Hohamed S. EI-Aasser, and Robert H. Fitch (editors) It is appropriate that the first NATO-Advanced Research Workshop on "FUTURE DIRECTIONS IN POLYMER COLLOIDS" was held approximately fifty years after the first synthetic polymer latexes were made on a commercial scale during the mid-1930s. Since that time the field of what is now known as polymer colloids has been evolving rapidly, not only on the practical level, but also on the scientific and engineering levels. Billions of pounds of copolymers are manufactured annually by means of the emulsion polymerization process. "Commodity" polymers as well "specialty" polymers are prepared today for use in a wide variety of applications: synthetic rubber, floor coatings, paints, adhesives, binders for non-woven fabrics, high-impact polymers latex foam, additives for construction materials such as cement and concrete, and rheological modifiers. They are also used in numerous biomedical applications: such as diagnostic tests, immunoassays, biological cell-labeling, (identi fication and separation), and drug delivery systems. Small quantities of monodisperse polymer colloids are used as size calibration standards and find extensive use as model colloids to test theories in colloids surface and rheological studies. Advances have been made in our understanding of the mechanism and kinetics of the emulsion polymerization process as well as the stability of polymer colloids. Equal advances were made in engineering areas related to polymer colloids, e. g. modeling of batch, semi-continuous and continuous emulsion polymerization and copolymer ization processes.
Download or read book Gases in Strong Rotation written by and published by . This book was released on 1983 with total page 874 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Atomindex written by International Atomic Energy Agency and published by . This book was released on 1965 with total page 1704 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Study of Turbulent Shear Flow in Non circular Pipes written by Elmer D. Parr and published by . This book was released on 1955 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1962 with total page 1116 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book List of References on Nuclear Energy written by International Atomic Energy Agency and published by . This book was released on 1965 with total page 844 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Oscillations in Piston Driven Shear Flow of a Non Newtonian Fluid written by and published by . This book was released on 1994 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent experiments on piston-driven shear flow of a highly elastic and very viscous non-Newtonian fluid. Lim and Schowalter observed nearly periodic oscillations in the particle velocity at the channel wall for particular values of the constant volumetric flow rate. Such periodicity has been characterized as a 'stick-/slip' phenomenon caused by the failure of the fluid to adhere to the wall. We suggest an alternative explanation for these oscillations using a dynamic mathematical model based on the Johnson-Segalman- Oldroyd constitutive relation, the key feature of which is a non-monotonic relationship between steady shear stress and strain rate. The resulting three- dimensional equations of motion and stress are reduced to one space dimension, consistent with experimental results. In the inertialess approximation, the equations governing the flow can be viewed as a continuous family of quadratic ordinary differential equations coupled by the non-local constraint that fixes the volumetric flow rate. Varying the flow rate, the numerical simulation of solutions to this system exhibits transitions to and from a regime with persistent oscillations that compare favorably with the Lim-Schowalter observations. When the time-asymptotic behavior is cyclic, large shear strain rates are observed in a thin but macroscopic layer near the wall. The transitions are explained using spectral analysis of the linear (infinite dimensional) operator resulting from linearization of the quadratic system about a discontinuous steady state with a jump discontinuity in the stress components. The persistent oscillations arise as a Hopf bifurcation to periodic orbits as the volumetric flow rate is increased beyond a critical value.
Download or read book Computational Rheology for Pipeline and Annular Flow written by Wilson C Chin and published by Elsevier. This book was released on 2001-07-30 with total page 271 pages. Available in PDF, EPUB and Kindle. Book excerpt: Computational Rheology for Pipeline and Annular Flow develops and applies modern analytical and computational finite difference methods for solving flow problems in drilling and production. It also provides valuable insights into flow assurance analysis in subsea pipeline design. Using modeling techniques that simulate the motion of non-Newtonian fluids, e.g., power law, Bingham plastic, and Herschel-Bulkley flows, this book presents proven annular flow methodologies for cuttings transport and stuck pipe analysis based on detailed experimental data obtained from highly deviated and horizontal wells. These methods are applied for highly eccentric borehole geometries to the design of pipeline bundles in subsea applications, where such annular configurations arise in velocity and thermal modeling applications.Also covered extensively are the design and modeling of pipelines having non-circular cross-sections, where deviations from ideal circular geometries arise from plugging due to wax deposition and the presence of hydrates and asphaltenes. As in the case of annular flows, the new algorithms apply to fluids with general rheological description; for example, the methods show very precisely how flow rate and pressure gradient vary nonlinearly in practical problem situations. - Provides valuable insights into flow assurance analysis. - Contains new algorithms on annular flows and fluids with general rheological descriptions supply solutions to practical problems.
Download or read book Influence of Superimposed Steady Shear Flow on the Dynamic Properties of Non Newtonian Fluids written by H. C. Booij and published by . This book was released on 1966 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Rarefied Gas Dynamics written by Felix Sharipov and published by John Wiley & Sons. This book was released on 2016-02-23 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aimed at both researchers and professionals who deal with this topic in their routine work, this introduction provides a coherent and rigorous access to the field including relevant methods for practical applications. No preceding knowledge of gas dynamics is assumed.
Download or read book Dynamics of Shear Flow of a Non Newtonian Fluid written by David S. Malkus and published by . This book was released on 1988 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: Viscoelastic materials with fading memory, e.g., polymers, suspensions, and emulsions, exhibit behavior that is intermediate between the nonlinear hyperbolic response of purely elastic materials and the strongly diffusive, parabolic response of viscous fluids. Many popular numerical methods used in the computation of steady viscoelastic flows fail in important flow regimes, and thus do not capture significant non-Newtonian phenomena. A key to satisfactory explanation of these phenomena is the study of the full dynamics of the flow. This paper studies the dynamics of shear flow, presenting a description of non-Newtonian phenomena caused by a non-monotone relation between the steady shear stress and shear strain-rate. Analytical results for such phenomena are surveyed, and three distinct numerical methods are developed to accurately compute the dynamics. The computations reproduce experimental measurements of non-Newtonian spurt in shearing flow through a slit die. They also predict related phenomena (such as hysteresis and shape memory); experiments are suggested to verify these predictions. Keywords: Hysteresis, Non Newtonian, Numerical methods, Phase plane, Shape memory, Shear flow, Spurt. (jhd).
Download or read book Analysis of New Phenomena in Shear Flow of Non Newtonian Fluids written by and published by . This book was released on 1989 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: Phase-plane and small-parameter asymptotic techniques are used to analyze systems of ordinary differential equations that describe the transient behavior of non-Newtonian fluids in shear flow. These systems approximate the partial differential equations that derive from three-dimensional balance laws and from differential constitutive models for highly elastic liquids. Two models are considered: one with a single relaxation time and small Newtonian viscosity; the other with two relaxation times and no Newtonian viscosity. Both possess the key feature that the variation of steady shear stress with strain rate is not monotone. The analysis shows that both models exhibit several distinctive phenomena: spurt, shape memory, hysteresis, latency, and normal stress oscillations. The predictions for the spurt phenomenon agree quantitatively with experimental results for polymer melts; the other new phenomena, which were discovered recently in numerical simulation, should also be observable in rheological experiments.
Download or read book The Structure of Turbulent Shear Flow written by and published by . This book was released on 1976 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Transactions of the Conference of Arsenal Mathematicians written by and published by . This book was released on 1980 with total page 820 pages. Available in PDF, EPUB and Kindle. Book excerpt:
