The Streamwise Development Of Two Dimensional Wall Jets And Other Two Dimensional Turbulent Shear Flows
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The Streamwise Development Of Two Dimensional Wall Jets And Other Two Dimensional Turbulent Shear Flows
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Author : Ian S. Gartshore
language : en
Publisher:
Release Date : 1965
The Streamwise Development Of Two Dimensional Wall Jets And Other Two Dimensional Turbulent Shear Flows written by Ian S. Gartshore and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1965 with Shear flow categories.
Technical Abstract Bulletin
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Author :
language : en
Publisher:
Release Date :
Technical Abstract Bulletin written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on with Science categories.
Development Of Three Dimensional Turbulent Wall Jets
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Author : Huongguang Sun
language : en
Publisher:
Release Date : 2002
Development Of Three Dimensional Turbulent Wall Jets written by Huongguang Sun and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Turbulence categories.
Detailed flow field measurements were performed to investigate the development of the three-dimensional wall jet, the effect of initial conditions on the development of wall jets and the evolution of the large-scale vortex structures that causes the large lateral growth rate in the flow. Single-point measurements in the wall jet exiting a contoured nozzle indicated that there were two regions in the intermediate field 10 & le; x/D & le; 40. The flow underwent a significant change in the region 10 & le; x/D & le; 20 as it adjusted to the wall. The changes of the profiles of the moments and the reorientation of the regions of the mean streamwise vorticity slowed down in the region beyond x/D = 20 and were not apparent by x/D = 40. The comparison of measurements of wall jets exiting the contoured nozzle and the fully developed long pipe indicated that changes in initial conditions do affect the jet half-widths and the decay of the maximum streamwise velocity through near and intermediate fields. The differences in growth rates of wall jets, profiles of moments and contours of the mean streamwise vorticity in the two jets were reduced in the region after x/D = 10 and were not apparent in the region beyond x/D = 20 & ndash;30. Measurements of two-point, two-time correlation of the streamwise fluctuating velocity indicated that the large-scale vortex structures that consist two pair of horseshoe vortices in the flow continued to develop throughout the intermediate field. In particular, the inner vortex structures were induced towards the wall by the outer structures and the legs of the outer structures inclined relative to the streamwise direction as the flow evolved downstream. Measurements also indicated that the flow below the outer region of the streamwise vorticity was laterally convected faster than the outer vortex structures.
Experimental Study Of Two Dimensional Turbulent Wall Jet Development With And Without Longitudinal Free Stream Pressure Gradient
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Author : Douglas Howard Neale
language : en
Publisher:
Release Date : 1971
Experimental Study Of Two Dimensional Turbulent Wall Jet Development With And Without Longitudinal Free Stream Pressure Gradient written by Douglas Howard Neale and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1971 with Jets categories.
An experimental study of various wall jet flows was conducted. The major areas of investigation were: The wall jet injected into still air; The wall jet under a constant-pressure main-stream flow; The wall jet subjected to an adverse pressure gradient imposed by a retarded main-stream flow with a substantially thickened initial boundary layer; The wall jet subjected to an adverse pressure gradient imposed by a retarded main-stream flow with a thickened and distorted initial boundary layer. Detailed velocity profile and local skin friction measurements were made at numerous streamwise distances from the jet slot. For the case in which no main-stream flow was present, the studies were carried out for a wide range of slot Reynolds numbers. For the wall jets with main-stream flow, selected ratios of free-stream velocity to jet velocity at the jet slot were investigated. The growth of characteristic thickness and decay of jet peak velocity is presented for all wall jet studies. Also, velocity and temperature profile similarity is described. Skin friction laws are shown for the constant-pressure wall jets and a single 'law of the wall' valid for all wall jet studies is set forth. Finally, the skin friction and velocity profile measurements are presented in tabular form. (Author).
Global Stability Analysis Of Shear Flows
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Author : Rameshkumar Bhoraniya
language : en
Publisher: Springer Nature
Release Date : 2023-03-10
Global Stability Analysis Of Shear Flows written by Rameshkumar Bhoraniya and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-03-10 with Science categories.
This book presents the fundamentals and advanced research on the global stability analysis of the shear flows. The contents investigate the results of global stability analysis for different configurations of internal and external shear flows. The topics covered are global stability analysis of converging-diverging channel flows, axisymmetric boundary layer developed on a circular cylinder, cone and inclined flat-plate boundary layer, and wall jets. It further explains the effect of divergence, convergence, transverse curvature, and pressure gradients on the global stability of the different configurations of shear flows. The book is a valuable reference for beginners, researchers, and professionals working in the field of aerodynamics and marine hydrodynamics.
The Origin Of Turbulence In Near Wall Flows
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Author : A.V. Boiko
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-03-09
The Origin Of Turbulence In Near Wall Flows written by A.V. Boiko and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-03-09 with Technology & Engineering categories.
The Origin of Species Charles Darwin The origin of turbulence in fluids is a long-standing problem and has been the focus of research for decades due to its great importance in a variety of engineering applications. Furthermore, the study of the origin of turbulence is part of the fundamental physical problem of turbulence description and the philosophical problem of determinism and chaos. At the end of the nineteenth century, Reynolds and Rayleigh conjectured that the reason of the transition of laminar flow to the 'sinuous' state is in stability which results in amplification of wavy disturbances and breakdown of the laminar regime. Heisenberg (1924) was the founder of linear hydrody namic stability theory. The first calculations of boundary layer stability were fulfilled in pioneer works of Tollmien (1929) and Schlichting (1932, 1933). Later Taylor (1936) hypothesized that the transition to turbulence is initi ated by free-stream oscillations inducing local separations near wall. Up to the 1940s, skepticism of the stability theory predominated, in particular due to the experimental results of Dryden (1934, 1936). Only the experiments of Schubauer and Skramstad (1948) revealed the determining role of insta bility waves in the transition. Now it is well established that the transition to turbulence in shear flows at small and moderate levels of environmental disturbances occurs through development of instability waves in the initial laminar flow. In Chapter 1 we start with the fundamentals of stability theory, employing results of the early studies and recent advances.
Applied Mechanics Reviews
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Author :
language : en
Publisher:
Release Date : 1968
Applied Mechanics Reviews written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1968 with Mechanics, Applied categories.
Transition Turbulence And Noise
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Author : Reda R. Mankbadi
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-11-27
Transition Turbulence And Noise written by Reda R. Mankbadi and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-11-27 with Science categories.
Turbulence takes place in most flow situations whethertheyoccur naturally or in technological systems. Therefore, considerable effort is being expended in an attempt to understand the phenomenon of turbulence. The recent discovery ofcoherent structure in turbulent shear flows and the modem developments in computer capabilities have revolutionized research work in turbulence. There is a strong evidence that the coherent structure in turbulent shear flows is reminiscent of nonlinear stability waves. As such, the interest in nonlinear stability waves has increased not only for the understandingofthe latterstages of the laminar-turbulent transition process, but also for understanding the coherent structures in turbulent flows. Also. the advances in computers have made direct numerical simulation possible at Low-Reynolds numbers and large-eddy simulation possible at high Reynolds numbers. This made first-principles prediction of turbulence-generated noise feasible. Therefore, this book aims at presenting a graduate-level introductory study of turbulence while accounting for such recent views of concern to researchers. This book is an outgrowth oflecture notes on the subject offered to graduate students in engineering. The book should be of interest to research engineers and graduatestudents in science and engineering. The theoretical basis presented is sufficient not only for studying the specialized literature on turbulence but also for theoretical investigations on the subject.
Advances In Turbulence
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Author : Stanley Corrsin
language : en
Publisher: CRC Press
Release Date : 1988-10-01
Advances In Turbulence written by Stanley Corrsin and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988-10-01 with Technology & Engineering categories.
Based on a symposium held in June 1986 in Minneapolis, USA, this volume surveys current information on turbulence measurement and modelling, computational fluid mechanics, vortex flow and physical modelling, cavitation and two-phase flow, bluff body flow and fluid structure interaction.
Two Dimensional Turbulent Wall Jets Over Curved Surfaces
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Author : D. E. Guitton
language : en
Publisher:
Release Date : 1964
Two Dimensional Turbulent Wall Jets Over Curved Surfaces written by D. E. Guitton and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1964 with categories.