Download or read book Numerical Investigation of Boundary Layer Instabilities in Natural Convection written by Tilek Aberra and published by . This book was released on 2011 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Numerical Investigation of Boundary Layer Instability and Transition Induced by Rotating Wall normal Cylindrical Roughness Elements written by Yongxiang Wu and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Convection in Porous Media written by Donald A. Nield and published by Springer. This book was released on 2017-03-15 with total page 988 pages. Available in PDF, EPUB and Kindle. Book excerpt: This updated edition of a widely admired text provides a user-friendly introduction to the field that requires only routine mathematics. The book starts with the elements of fluid mechanics and heat transfer, and covers a wide range of applications from fibrous insulation and catalytic reactors to geological strata, nuclear waste disposal, geothermal reservoirs, and the storage of heat-generating materials. As the standard reference in the field, this book will be essential to researchers and practicing engineers, while remaining an accessible introduction for graduate students and others entering the field. The new edition features 2700 new references covering a number of rapidly expanding fields, including the heat transfer properties of nanofluids and applications involving local thermal non-equilibrium and microfluidic effects.
Download or read book Numerical Study of Stability and Transition of Free Convection Boundary Layer Flows written by A. Seyedfathi and published by . This book was released on 1974 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Experimental Investigation of the Natural Convection Boundary Layer Over a Uniform Flux Inclined Surface written by Hussain Shaukatullah and published by . This book was released on 1978 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Experimental Investigation of the Transition of Vertical Natural Convection Boundary Layers written by Francis Louis Godaux and published by . This book was released on 1972 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Study of Stability Transition and Separation in Natural Convection Flows written by Jogesh Jaluria and published by . This book was released on 1974 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Numerical Study of the Non Oberbeck Boussinesq Effects in Turbulent Water filled Cavities written by Deniz Kizildag and published by . This book was released on 2016 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt: The work carried out in the framework of the present thesis aims at shedding light into the complex phenomena involved in turbulent water-filled cavities, questioning the validity of the well-established Oberbeck-Boussinesq effects, and determining the influence of these on the flow structure and heat transfer. First, the relevance of the variable thermophyical properties have been submitted to investigation by means of direct numerical simulations of a differentially heated cavity flow using the aspect ratio of a particular prototype. The simulations consider the so-called non-Oberbeck-Boussinesq effects, and study the temperature range for which these effects could be considered relevant. The work has been conducted employing a 2D flow assumption, estimating that this methodology -promoted by the necessity of a compromise between the accuracy and the cost of the simulations- would be valid to detect the non-Oberbeck-Boussinesq effects without the loss of generality, even though the actual flow structures of the flow are inherently 3D. The numerical results have revealed that up to the temperature difference of 30 oC, Oberbeck-Boussinesq solution can estimate the heat transfer within 1 % error, although the loss of symmetry is certified even for a temperature difference of 10 oC. Moreover, it has been observed that the boundary layers at hot and cold isothermal confining walls behave differently, such that the boundary layer instabilities and transition to turbulence location move downstream along the hot wall and upstream along the cold wall. As a consequence, the stratification region shifts upwards, giving rise to higher stratification numbers. Later, the non-Oberbeck-Boussinesq effects have been studied considering three-dimensional domain by means of direct numerical simulations, in the quest of analyzing their impact on the three-dimensional flow structure. The results have revealed delayed transition in the hot wall and earlier triggered transition in the cold wall boundary layers. This has been shown to be a consequence of the initial heating of the cavity due to favorable heat transfer properties in the hot wall boundary layer, which results in warmer upper cavity. As time advances, due to the influence of the stratified flow feeding the hot and cold boundary layers, the strength of the natural convection gradually decreases and increases in the hot and cold boundary layers, respectively. When a balance is attained between these two boundary layers, the cold wall boundary is found at a higher equivalent Rayleigh number, justifying its premature transition. Accordingly, the early transitioning cold wall boundary layer is thicker. This boundary layer interacts actively with the hot wall boundary layer, causing vertical oscillations in the transition to turbulent locations on both boundary layers. This interaction is also responsible for the degradation of the already shifted stratification zone. Besides the qualitative agreement in some aspects, this important effect is not captured by means of 2D simulations, which invalidates 2D flow hypothesis when it comes to describing the flow characteristics with non-Oberbeck-Boussinesq effects. As for the heat transfer, the Non-Oberbeck-Boussinesq effects do not necessarily enhance the heat transfer, as Oberbeck-Boussinesq solution is observed to overestimate the Nusselt number by about 3 %. Last but not the least, considering the huge computational resources required for simulating these turbulent natural convection flows with water, and bearing in mind the importance of an appropriate modeling of the present phenomena, different subgrid-scale models have been analyzed in order to predict the thermal and fluid dynamics of the flow within a turbulent water-filled cavity. It has been shown that the performance of the models is directly linked to the accurate prediction of the transition to turbulence, which is the main challenge in the proper modeling of this flow.
Download or read book A Theoretical and Experimental Investigation of the Stability of Transient Natural Convection written by Robert Charles Gunness and published by . This book was released on 1966 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Colliding Natural Convection Boundary Layer Flow in a Rectangular Enclosure written by Weigung Wang and published by . This book was released on 1989 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Atmospheric Boundary Layer written by J. R. Garratt and published by Cambridge University Press. This book was released on 1994-04-21 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book gives a comprehensive and lucid account of the science of the atmospheric boundary layer (ABL). There is an emphasis on the application of the ABL to numerical modelling of the climate. The book comprises nine chapters, several appendices (data tables, information sources, physical constants) and an extensive reference list. Chapter 1 serves as an introduction, with chapters 2 and 3 dealing with the development of mean and turbulence equations, and the many scaling laws and theories that are the cornerstone of any serious ABL treatment. Modelling of the ABL is crucially dependent for its realism on the surface boundary conditions, and chapters 4 and 5 deal with aerodynamic and energy considerations, with attention to both dry and wet land surfaces and sea. The structure of the clear-sky, thermally stratified ABL is treated in chapter 6, including the convective and stable cases over homogeneous land, the marine ABL and the internal boundary layer at the coastline. Chapter 7 then extends the discussion to the cloudy ABL. This is seen as particularly relevant, since the extensive stratocumulus regions over the subtropical oceans and stratus regions over the Arctic are now identified as key players in the climate system. Finally, chapters 8 and 9 bring much of the book's material together in a discussion of appropriate ABL and surface parameterization schemes in general circulation models of the atmosphere that are being used for climate simulation.
Download or read book Numerical Study of Boundary Layer Instability of Flow Over Axisymmetric Cylinder written by Kai-Hsiung Kao and published by . This book was released on 1990 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Natural Convection written by Yogesh Jaluria and published by Pergamon. This book was released on 1980 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Theoretical and Experimental Study of the Stability of the Laminar Natural Convection Boundary Layer Over a Vertical Uniform Flux Plate written by Cyrus Philipp Knowles and published by . This book was released on 1967 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Investigation of Instabilities Encountered During Heat Transfer to a Supercritical Fluid written by Archie Junior Cornelius and published by . This book was released on 1965 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stability and Transition written by Tuncer Cebeci and published by Springer. This book was released on 2004 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: Accompanying CD-ROMs include computer programs referred to in chapters 4-8 and Appendix B
Download or read book Direct and Large Eddy Simulation XI written by Maria Vittoria Salvetti and published by Springer. This book was released on 2019-02-02 with total page 608 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gathers the proceedings of the 11th workshop on Direct and Large Eddy Simulation (DLES), which was held in Pisa, Italy in May 2017. The event focused on modern techniques for simulating turbulent flows based on the partial or full resolution of the instantaneous turbulent flow structures, as Direct Numerical Simulation (DNS), Large-Eddy Simulation (LES) or hybrid models based on a combination of LES and RANS approaches. In light of the growing capacities of modern computers, these approaches have been gaining more and more interest over the years and will undoubtedly be developed and applied further. The workshop offered a unique opportunity to establish a state-of-the-art of DNS, LES and related techniques for the computation and modeling of turbulent and transitional flows and to discuss about recent advances and applications. This volume contains most of the contributed papers, which were submitted and further reviewed for publication. They cover advances in computational techniques, SGS modeling, boundary conditions, post-processing and data analysis, and applications in several fields, namely multiphase and reactive flows, convection and heat transfer, compressible flows, aerodynamics of airfoils and wings, bluff-body and separated flows, internal flows and wall turbulence and other complex flows.
