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Author :
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ISBN 13 :
Total Pages : 7 pages
Book Rating : 4.:/5 (893 download)
Download or read book Experimental Observations on Transition to Turbulence in Confined Coaxial Jets and Other Boundary Layer Flows written by and published by . This book was released on 1990 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 376 pages
Book Rating : 4.:/5 (3 download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author : William W. Bower
Publisher :
ISBN 13 :
Total Pages : 182 pages
Book Rating : 4.F/5 ( download)
Download or read book Forum on Turbulent Flows, 1990 written by William W. Bower and published by . This book was released on 1990 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 1010 pages
Book Rating : 4.:/5 (319 download)
Download or read book Energy Research Abstracts written by and published by . This book was released on 1990 with total page 1010 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (228 download)
Download or read book Robustness and Transition to Turbulence in Boundary Layer Flows written by and published by . This book was released on 2001 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding the dynamics of transition to turbulence in shear flows has been a long standing problem, and although substantial progress has been made in various directions to this effect, there is still no consistent theory. As prt of AFOSR MURI project 'Uncertainty Management in Complex Systems' at the California Institute of Technology (CalTech) with John Doyle as the principal investigator, a novel theory was developed on the transition to turbulence borrowing notions from control theory. This provides a promising framework that will help explain the various experimental observations of transition to turbulence. In order to make an accurate comparison between theory, computation and experiment, a boundary layer experiment was designed using state of the art, three-dimensional, instantaneous measurement techniques. In this report we discuss the details of the experiment and its connections with the ongoing theory and computations.
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ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (528 download)
Download or read book Robustness and Transition to Turbulence in Boundary Layer Flows written by and published by . This book was released on 2001 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding the dynamics of transition to turbulence in shear flows has been a long standing problem, and although substantial progress has been made in various directions to this effect, there is still no consistent theory. As prt of AFOSR MURI project 'Uncertainty Management in Complex Systems' at the California Institute of Technology (CalTech) with John Doyle as the principal investigator, a novel theory was developed on the transition to turbulence borrowing notions from control theory. This provides a promising framework that will help explain the various experimental observations of transition to turbulence. In order to make an accurate comparison between theory, computation and experiment, a boundary layer experiment was designed using state of the art, three-dimensional, instantaneous measurement techniques. In this report we discuss the details of the experiment and its connections with the ongoing theory and computations.
Author : Adrian Bejan
Publisher : John Wiley & Sons
ISBN 13 : 1118330080
Total Pages : 708 pages
Book Rating : 4.1/5 (183 download)
Download or read book Convection Heat Transfer written by Adrian Bejan and published by John Wiley & Sons. This book was released on 2013-03-28 with total page 708 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new edition of the bestseller on convection heat transfer A revised edition of the industry classic, Convection Heat Transfer, Fourth Edition, chronicles how the field of heat transfer has grown and prospered over the last two decades. This new edition is more accessible, while not sacrificing its thorough treatment of the most up-to-date information on current research and applications in the field. One of the foremost leaders in the field, Adrian Bejan has pioneered and taught many of the methods and practices commonly used in the industry today. He continues this book's long-standing role as an inspiring, optimal study tool by providing: Coverage of how convection affects performance, and how convective flows can be configured so that performance is enhanced How convective configurations have been evolving, from the flat plates, smooth pipes, and single-dimension fins of the earlier editions to new populations of configurations: tapered ducts, plates with multiscale features, dendritic fins, duct and plate assemblies (packages) for heat transfer density and compactness, etc. New, updated, and enhanced examples and problems that reflect the author's research and advances in the field since the last edition A solutions manual Complete with hundreds of informative and original illustrations, Convection Heat Transfer, Fourth Edition is the most comprehensive and approachable text for students in schools of mechanical engineering.
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ISBN 13 :
Total Pages : 742 pages
Book Rating : 4.:/5 (26 download)
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1967 with total page 742 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Kirti N. Ghia
Publisher :
ISBN 13 :
Total Pages : 100 pages
Book Rating : 4.:/5 (31 download)
Download or read book Turbulent Mixing in the Initial Region of Heterogeneous Axisymmetric Coaxial Confined Jets written by Kirti N. Ghia and published by . This book was released on 1970 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 1120 pages
Book Rating : 4.3/5 (243 download)
Download or read book Government Reports Annual Index written by and published by . This book was released on 1990 with total page 1120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 1266 pages
Book Rating : 4.:/5 (319 download)
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1990 with total page 1266 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : J. Zhu
Publisher :
ISBN 13 :
Total Pages : 30 pages
Book Rating : 4.:/5 (31 download)
Download or read book A Numerical Study of Confined Turbulent Jets written by J. Zhu and published by . This book was released on 1993 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: A numerical investigation is reported of turbulent incompressible jets confined in two ducts, one cylindrical and the other conical with a 5 degree divergence. In each case, three Craya-Curtet numbers are considered which correspond, respectively, to flow situations with no moderate and strong recirculation. Turbulence closure is achieved by using the k-epsilon model and a recently proposed realizable Reynolds stress algebraic equation model that relates the Reynolds stresses explicitly to the quadratic terms of the mean velocity gradients and ensures the positiveness of each component of the turbulent kinetic energy. Calculations are carried out with a finite-volume procedure using boundary-fitted curvilinear coordinates. A second-order accurate, bounded convection scheme and sufficiently fine grids are used to prevent the solutions from being contaminated by numerical diffusion. The calculated results are compared extensively with the available experimental data. It is shown that the numerical methods presented are capable of capturing the essential flow features observed in the experiments and that the realizable Reynolds stress algebraic equation model performs much better than the k-epsilon model for this class of flows of great practical importance.
Author : Jeyhoon Mamaghani Khodadadi
Publisher :
ISBN 13 :
Total Pages : 460 pages
Book Rating : 4.:/5 (161 download)
Download or read book An Experimental and Numerical Investigation of Confined Coaxial Turbulent Jets written by Jeyhoon Mamaghani Khodadadi and published by . This book was released on 1986 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Julien Rémy Dominique Gérard Landel
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (16 download)
Download or read book Dynamics of Quasi-two-dimensional Turbulent Jets written by Julien Rémy Dominique Gérard Landel and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The study of quasi-two-dimensional turbulent jets is relevant to chemical reactors, the coking process in oil refinement, as well as rivers flowing into lakes or oceans. In the event of a spillage of pollutants into a river, it is critical to understand how these agents disperse with the flow in order to assess damage to the environment. For such flows, characteristic streamwise and cross-stream dimensions can be much larger than the fluid-layer thickness, and so the flow develops in a confined environment. When the distance away from the discharge location is larger than ten times the fluid-layer thickness, the flow is referred to as a quasi-two-dimensional jet. From experimental observations using dyed jets and particle image velocimetry, we find that the structure of a quasi-two-dimensional jet consists of a high-speed meandering core with large counter-rotating eddies developing on alternate sides of the core. The core and eddy structure is self-similar with distance from the discharge location. The Gaussianity of the cross-stream distribution of the time-averaged velocity is due, in part, to the sinuous instability of the core. To understand the transport and dispersion properties of quasi-two-dimensional jets we use a time-dependent advection--diffusion equation, with a mixing length hypothesis accounting for the turbulent eddy diffusivity. The model is supported by experimental releases of dye in jets or numerical releases of virtual passive tracers in experimentally-measured jet velocity fields. We consider the statistical properties of this flow by releasing and then tracking large clusters of virtual particles in the jet velocity field. The probability distributions of two-point properties (such as the distance between two particles) reveal large streamwise dispersion. Owing to this streamwise dispersive effect, a significant amount of tracers can be transported faster than the speed predicted by a simple advection model. Using potential theory, we determine the flow induced by a quasi-two-dimensional jet confined in a rectangular domain. The streamlines of the induced flow predicted by the theory agree with experimental measurements away from the jet boundary. Finally, we investigate the case of a quasi-two-dimensional particle-laden jet. Depending on the bulk concentration of dense particles, we identify different flow regimes. At low concentrations, the jet features the same core and eddy structure observed without the particles, and thus quasi-two-dimensional jet theory can apply to some extent. At larger concentrations, we observe an oscillating instability of the particle-laden jet.
Author : L. N. Pyatnitsky
Publisher : Springer Science & Business Media
ISBN 13 : 9048122511
Total Pages : 197 pages
Book Rating : 4.0/5 (481 download)
Download or read book Turbulence Nature and the Inverse Problem written by L. N. Pyatnitsky and published by Springer Science & Business Media. This book was released on 2009-03-22 with total page 197 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hydrodynamic equations well describe averaged parameters of turbulent steady flows, at least in pipes where boundary conditions can be estimated. The equations might outline the parameters fluctuations as well, if entry conditions at current boundaries were known. This raises, in addition, the more comprehensive problem of the primary perturbation nature, noted by H.A. Lorentz, which still remains unsolved. Generally, any flow steadiness should be supported by pressure waves emitted by some external source, e.g. a piston or a receiver. The wave plane front in channels quickly takes convex configuration owing to Rayleigh's law of diffraction divergence. The Schlieren technique and pressure wave registration were employed to investigate the wave interaction with boundary layer, while reflecting from the channel wall. The reflection induces boundary-layer local separation and following pressure rapid increase within the perturbation zone. It propagates as an acoustic wave packet of spherical shape, bearing oscillations of hydrodynamic parameters. Superposition of such packets forms a spatio-temporal field of oscillations fading as 1/r. This implies a mechanism of the turbulence. Vorticity existing in the boundary layer does not penetrate in itself into potential main stream. But the wave leaving the boundary layer carries away some part of fluid along with frozen-in vorticity. The vorticity eddies form another field of oscillations fading as 1/r2. This implies a second mechanism of turbulence. Thereupon the oscillation spatio-temporal field and its randomization development are easy computed. Also, normal burning transition into detonation is explained, and the turbulence inverse problem is set and solved as applied to plasma channels created by laser Besselian beams.
Author : American Institute of Aeronautics and Astronautics
Publisher :
ISBN 13 :
Total Pages : 1224 pages
Book Rating : 4.F/5 ( download)
Download or read book AIAA Journal written by American Institute of Aeronautics and Astronautics and published by . This book was released on 1998 with total page 1224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Roop N. Gupta
Publisher :
ISBN 13 :
Total Pages : 44 pages
Book Rating : 4.:/5 (31 download)
Download or read book Theoretical study of reactive and nonreactive turbulent coaxial jets written by Roop N. Gupta and published by . This book was released on 1976 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
