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The Spatial Structure Of Turbulent Rayleigh Bernard Convection
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Author :Richard Lawrence Joseph Fernandes Publisher :Ann Arbor, Mich. : University Microfilms International ISBN 13 : Total Pages :318 pages Book Rating :4.:/5 (471 download)
Book Synopsis The Spatial Structure of Turbulent Rayleigh-Bénard Convection by : Richard Lawrence Joseph Fernandes
Download or read book The Spatial Structure of Turbulent Rayleigh-Bénard Convection written by Richard Lawrence Joseph Fernandes and published by Ann Arbor, Mich. : University Microfilms International. This book was released on 2001 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Spatial Structure of Turbulent Rayleigh-Bernard Convection by : Richard L. Fernandes
Download or read book The Spatial Structure of Turbulent Rayleigh-Bernard Convection written by Richard L. Fernandes and published by . This book was released on 2001 with total page 159 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Statistics and Scaling in Turbulent Rayleigh-Bénard Convection by : Emily S.C. Ching
Download or read book Statistics and Scaling in Turbulent Rayleigh-Bénard Convection written by Emily S.C. Ching and published by Springer Science & Business Media. This book was released on 2013-08-13 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Brief addresses two issues of interest of turbulent Rayleigh-Bénard convection. The first issue is the characterization and understanding of the statistics of the velocity and temperature fluctuations in the system. The second issue is the revelation and understanding of the nature of the scaling behavior of the velocity temperature structure functions. The problem under the Oberbeck-Boussinesq approximation is formulated. The statistical tools, including probability density functions (PDF) and conditional statistics, for studying fluctuations are introduced, and implicit PDF formulae for fluctuations obeying certain statistical symmetries are derived. Applications of these PDF formulae to study the fluctuations in turbulent Rayleigh-Bénard convection are then discussed. The phenomenology of the different types of scaling behavior: the Bolgiano-Obhukov scaling behavior when buoyancy effects are significant and the Kolmogorov-Obukhov-Corrsin scaling behavior when they are not, is introduced. A crossover between the two types of scaling behavior is expected to occur at the Bolgiano length scale above which buoyancy is important. The experimental observations are reviewed. In the central region of the convective cell, the Kolmogorov-Obukhov-Corrsin scaling behavior has been observed. On the other hand, the Bolgiano-Obukhov scaling remains elusive only until recently. By studying the dependence of the conditional temperature structure functions on the locally averaged thermal dissipation rate, evidence for the Bolgiano-Obukhov scaling has recently been found near the bottom plate. The different behaviors observed in the two regions could be attributed to the different size of the Bolgiano scale. What physics determines the relative size of the Bolgiano scale remains to be understood. The Brief is concluded by a discussion of these outstanding issues.
Book Synopsis Rayleigh-benard Convection: Structures And Dynamics by : Alexander V Getling
Download or read book Rayleigh-benard Convection: Structures And Dynamics written by Alexander V Getling and published by World Scientific. This book was released on 1998-03-06 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: This invaluable book presents a concise but systematic account of the formation of spatial flow structures in a horizontal fluid layer heated from below. Flows of this type, known as Rayleigh-Bénard convection, show important features of behaviour inherent not only in various hydrodynamic-instability phenomena but also in nonlinear pattern-forming processes in other contexts. The book describes the basic methods of investigating convection patterns, and the types of two- and three-dimensional flows, pattern defects, and sequences of convection-regime changes.The author pays special attention to the question of how various factors (mainly reducible to initial and boundary conditions) determine the shapes and sizes of the structures which develop. In this way, the role of order and disorder in flow patterns, as a factor strongly affecting the character of the evolution of structures, is revealed. The presentation emphasizes the physical picture of these phenomena, without excessive mathematical detail.
Book Synopsis Development of Experimental Techniques and Studies of Spatial Structure in Turbulent Thermal Convection by : Peter William Offutt
Download or read book Development of Experimental Techniques and Studies of Spatial Structure in Turbulent Thermal Convection written by Peter William Offutt and published by . This book was released on 1995 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt: Particle-image velocimetry (PIV), shadowgraph, and thermochroic liquid crystal techniques are applied to the study of spatial structure of turbulent thermal convection in wide horizontal water layers. A large-aspect-ratio test section for the study of turbulent Rayleigh convection in water has been constructed, instrumented and characterized. Boundary temperature measurements reveal significant finite Biot number effects for water bounded by aluminum. Particle-image velocimetry measurements in a vertical plane in Rayleigh convection gave approximately 8500 velocity vectors in each of 62 instantaneous realizations at a Rayleigh number of 1.0 $times$ 10$sp{8}$. The vector fields reveal structures ranging in size from a few millimeters in the boundary regions to large-scale motions spanning the 10 cm layer depth. Ensemble one-point statistics of the velocity field, including the mean velocity field, root-mean-square profiles, and probability-density functions of the vertical velocity as a function of height are presented. The PIV data have also provided the first measurements of the two-point spatial velocity correlation in turbulent Rayleigh convection. The PIV measurements are supplemented by thermochroic liquid crystal visualizations of temperature fields on the lower boundary, and by shadowgraph projections of the temperature fields in the bulk. The shadowgraphs reveal well-defined, viscous thermal plumes which generally cross the layer intact; midlayer transit measurements from videotaped shadowgraphs in Rayleigh convection and unsteady nonpenetrative convection give ascent rates of 1.4 to 1.5 times Deardorff's inviscid convective velocity scale. The thermochroic boundary temperature visualizations showed plumes emanating from nodes in a network of warm lines enclosing patches of cooler fluid. Deardorff's inviscid velocity and temperature scales for the core are refined by enforcing equality of bulk turbulent production and spectral energy transfer. The collapse of velocity fluctuation data under the new "bulk" scales for different modes of turbulent thermal convection shows the old systematic discrepancies arose from dimensionally correct but numerically arbitrary scale definitions. Also, under the new scaling, a monotonic Rayleigh number dependence emerges among the core temperature fluctuation profiles. This trend indicates that true high-Reynolds-number invariance is not achieved at Rayleigh numbers accessible to direct numerical simulation and laboratory-scale experiments.
Book Synopsis Turbulent Rayleigh-Bénard Convection of Low Prandtl-number Gases by : James Douglas Hogg
Download or read book Turbulent Rayleigh-Bénard Convection of Low Prandtl-number Gases written by James Douglas Hogg and published by . This book was released on 2012 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: Spatial power spectra of the shadowgraph images showed peaks at small wavelengths which decreased with increasing Rayleigh number. Only at the highest observed Rayleigh numbers were large-scale structures comparable in size to the height of the cell observed.
Book Synopsis Turbulent Convection in Rayleigh-Bénard Cells with Modified Boundary Conditions by : Andrés Alonso Castillo-Castellanos
Download or read book Turbulent Convection in Rayleigh-Bénard Cells with Modified Boundary Conditions written by Andrés Alonso Castillo-Castellanos and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: One outstanding feature of the Rayleigh-Bénard problem which concerns a horizontal fluid layer heated from below and cooled from above, is the spontaneous establishment of spatial ordering and the formation of a coherent large-scale circulation. How different factors, such as the domain geometry and boundary conditions, influence the sizes and shapes of the large-scale flow remains an open question. Despite its apparent simplicity, Rayleigh-Bénard convection exhibits some incredibly rich and complex large-scale dynamics such as torsional modes, rotation, sloshing, and cessations, which often coexist and compete to each other. One approach, commonly used in the study of cessations is to constrain the large scale circulation to a plane by restricting the fluid domain to a (2-D) square cell or to a slim rectangular cell of small aspect ratio in the transversal direction. However, it is not entirely clear whether the 2-D and (quasi-)2-D reversals correspond to the same phenomenon. The present document is dedicated to the study of the large-scale flow patterns in turbulent Rayleigh-Bénard convection, and of the influence exerted by different factors on the flow structures and on their temporal evolution. The proposed characterization combines a statistical analysis with a physical approach relying on the angular momentum as well as the kinetic and potential energies to highlight the underlying physical mechanisms. We subsequently attempt to tie these mechanisms together to each of the distinctive flow patterns observed and to their evolution.
Book Synopsis Structures, Boundary Layers and Plumes in Turbulent Rayleigh-Bénard Convection by :
Download or read book Structures, Boundary Layers and Plumes in Turbulent Rayleigh-Bénard Convection written by and published by . This book was released on 2015 with total page 187 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Coherent Structures in Turbulent Rayleigh-Bénard Convection by : Tomi Haramina
Download or read book Coherent Structures in Turbulent Rayleigh-Bénard Convection written by Tomi Haramina and published by . This book was released on 2005 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Structure of Turbulent Shear Flow by : A. A. R. Townsend
Download or read book The Structure of Turbulent Shear Flow written by A. A. R. Townsend and published by Cambridge University Press. This book was released on 1976 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt: Develops a physical theory from the mass of experimental results, with revisions to reflect advances of recent years.
Book Synopsis Direct and Large-Eddy Simulation VIII by : Hans Kuerten
Download or read book Direct and Large-Eddy Simulation VIII written by Hans Kuerten and published by Springer Science & Business Media. This book was released on 2011-10-05 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume continues previous DLES proceedings books, presenting modern developments in turbulent flow research. It is comprehensive in its coverage of numerical and modeling techniques for fluid mechanics. After Surrey in 1994, Grenoble in 1996, Cambridge in 1999, Enschede in 2001, Munich in 2003, Poitiers in 2005, and Trieste in 2009, the 8th workshop, DLES8, was held in Eindhoven, The Netherlands, again under the auspices of ERCOFTAC. Following the spirit of the series, the goal of this workshop is to establish a state-of-the-art of DNS and LES techniques for the computation and modeling of transitional/turbulent flows covering a broad scope of topics such as aerodynamics, acoustics, combustion, multiphase flows, environment, geophysics and bio-medical applications. This gathering of specialists in the field was a unique opportunity for discussions about the more recent advances in the prediction, understanding and control of turbulent flows in academic or industrial situations.
Book Synopsis Thermal Characteristics and Convection in Nanofluids by : Aditya Kumar
Download or read book Thermal Characteristics and Convection in Nanofluids written by Aditya Kumar and published by Springer Nature. This book was released on 2021-01-04 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers synthesis, characterization, stability, heat transfer and applications of nanofluids. It includes different types of nanofluids, their preparation methods as well as its effects on the stability and thermophysical properties of nanofluids. It provides a discussion on the mechanism behind the change in the thermal properties of nanofluids and heat transfer behaviour. It presents the latest information and discussion on the preparation and advanced characterization of nanofluids. It also consists of stability analysis of nanofluids and discussion on why it is essential for the industrial application. The book provides a discussion on thermal boundary layer properties in convection. Future directions for heat transfer applications to make the production and application of nanofluids at industrial level are also discussed.
Book Synopsis Dynamics of Spatio-Temporal Cellular Structures by : Innocent Mutabazi
Download or read book Dynamics of Spatio-Temporal Cellular Structures written by Innocent Mutabazi and published by Springer. This book was released on 2010-06-14 with total page 249 pages. Available in PDF, EPUB and Kindle. Book excerpt: The impact of Benard's discovery on 20th century physics is crucial to any modern research area such as fluid dynamics, nonlinear dynamics, and non-equilibrium thermodynamics, just to name a few. This centenary review shows the broad scope and development including modern applications, edited and written by experts in the field.
Book Synopsis Lecture Notes on Turbulence and Coherent Structures in Fluids, Plasmas and Nonlinear Media by : Michael Shats
Download or read book Lecture Notes on Turbulence and Coherent Structures in Fluids, Plasmas and Nonlinear Media written by Michael Shats and published by World Scientific. This book was released on 2006 with total page 397 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is based on the lectures delivered at the 19th Canberra International Physics Summer School held at the Australian National University in Canberra (Australia) in January 2006.The problem of turbulence and coherent structures is of key importance in many fields of science and engineering. It is an area which is vigorously researched across a diverse range of disciplines such as theoretical physics, oceanography, atmospheric science, magnetically confined plasma, nonlinear optics, etc. Modern studies in turbulence and coherent structures are based on a variety of theoretical concepts, numerical simulation techniques and experimental methods, which cannot be reviewed effectively by a single expert.The main goal of these lecture notes is to introduce state-of-the-art turbulence research in a variety of approaches (theoretical, numerical simulations and experiments) and applications (fluids, plasmas, geophysics, nonlinear optical media) by several experts. A smooth introduction is presented to readers who are not familiar with the field, while reviewing the most recent advances in the area. This collection of lectures will provide a useful review for both postgraduate students and researchers new to the advancements in this field, as well as specialists seeking to expand their knowledge across different areas of turbulence research.
Book Synopsis Experimental Studies of the Statistical Properties of Coherent Thermal Structures in Turbulent Rayleigh-Bénard Convection by : Shengqi Zhou
Download or read book Experimental Studies of the Statistical Properties of Coherent Thermal Structures in Turbulent Rayleigh-Bénard Convection written by Shengqi Zhou and published by . This book was released on 2000 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Direct and Large-Eddy Simulation X by : Dimokratis G.E. Grigoriadis
Download or read book Direct and Large-Eddy Simulation X written by Dimokratis G.E. Grigoriadis and published by Springer. This book was released on 2017-10-06 with total page 523 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book addresses nearly all aspects of the state of the art in LES & DNS of turbulent flows, ranging from flows in biological systems and the environment to external aerodynamics, domestic and centralized energy production, combustion, propulsion as well as applications of industrial interest. Following the advances in increased computational power and efficiency, several contributions are devoted to LES & DNS of challenging applications, mainly in the area of turbomachinery, including flame modeling, combustion processes and aeroacoustics. The book includes work presented at the tenth Workshop on 'Direct and Large-Eddy Simulation' (DLES-10), which was hosted in Cyprus by the University of Cyprus, from May 27 to 29, 2015. The goal of the workshop was to establish a state of the art in DNS, LES and related techniques for the computation and modeling of turbulent and transitional flows. The book is of interest to scientists and engineers, both in the early stages of their career and at a more senior level.
Book Synopsis Introduction to Turbulent Transfer of Particles, Temperature and Magnetic Fields by : Igor Rogachevskii
Download or read book Introduction to Turbulent Transfer of Particles, Temperature and Magnetic Fields written by Igor Rogachevskii and published by Cambridge University Press. This book was released on 2021-08-05 with total page 271 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introducing key concepts in turbulent transport with an overview of analytical and statistical tools to advanced graduates and researchers.
