Streamwise Vortices In Heated Boundary Layers

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Streamwise Vortices in Heated Boundary Layers

Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781722804312
Total Pages : 44 pages
Book Rating : 4.8/5 (43 download)

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Book Synopsis Streamwise Vortices in Heated Boundary Layers by : National Aeronautics and Space Administration (NASA)

Download or read book Streamwise Vortices in Heated Boundary Layers written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-11 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: The nonlinear instability of the boundary layer on a heated flat plate placed in an oncoming flow is investigated. Such flows are unstable to stationary vortex instabilities and inviscid traveling wave disturbances governed by the Taylor-Goldstein equation. For small temperature differences the Taylor-Goldstein equation reduces to Rayleigh's equation. When the temperature difference between the wall and free stream is small the preferred mode of instability is a streamwise vortex. It is shown in this case that the vortex, assumed to be of small wavelength, restructures the underlying mean flow to produce a profile which can be massively unstable to inviscid traveling waves. The mean state is shown to be destabilized or stabilized to inviscid waves depending on whether the Prandtl number is less or greater than unity. Hall, Philip Unspecified Center NAS1-18605; RTOP 505-90-52-01...

Streamwise Vortices in Heated Boundary Layers

Author : Institute for Computer Applications in Science and Engineering
Publisher :
ISBN 13 :
Total Pages : 48 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis Streamwise Vortices in Heated Boundary Layers by : Institute for Computer Applications in Science and Engineering

Download or read book Streamwise Vortices in Heated Boundary Layers written by Institute for Computer Applications in Science and Engineering and published by . This book was released on 1992 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:

The Fluid Dynamics and Heat Transfer Effects of Streamwise Vortices Embedded in a Turbulent Boundary Layer

Author : Stanford University. Thermosciences Division. Thermosciences Division
Publisher :
ISBN 13 :
Total Pages : 388 pages
Book Rating : 4.F/5 ( download)

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Book Synopsis The Fluid Dynamics and Heat Transfer Effects of Streamwise Vortices Embedded in a Turbulent Boundary Layer by : Stanford University. Thermosciences Division. Thermosciences Division

Download or read book The Fluid Dynamics and Heat Transfer Effects of Streamwise Vortices Embedded in a Turbulent Boundary Layer written by Stanford University. Thermosciences Division. Thermosciences Division and published by . This book was released on 1988 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Preliminary Analytical Explorations of Heat Transfer from Boundary Layers Containing Streamwise Vortices

Author : Leif N. Persen
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (227 download)

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Book Synopsis Preliminary Analytical Explorations of Heat Transfer from Boundary Layers Containing Streamwise Vortices by : Leif N. Persen

Download or read book Preliminary Analytical Explorations of Heat Transfer from Boundary Layers Containing Streamwise Vortices written by Leif N. Persen and published by . This book was released on 1967 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The present investigation is concerned with the swirling inlet flow in a cylindrical tube and the heat transfer in the entrance region. This is a chosen model problem for the Gortler-type vortices which occur in boundary layer flow in order to gain more insight in the mechanism of vortices with their axes in the streamwise directions. Conclusions are being drawn on the final breakdown of the Gortler-type vortex system and the dependence on the Reynolds' number and the Prandtl number of the increase in heat transfer rates is brought out. The findings suggest that the vortex motion alone is not responsible for the large increases in heat transfer rates which have been observed. The induced motion which is created by such vortices in boundary layers is suggested as the possible mechanism responsible. (Author).

The Fluid Dynamics and Heat Trnsfer Effects of Streamwise Vortices Embedded in a Turbulent Boundary Layer

Author : Wayne Robert Pauley
Publisher :
ISBN 13 :
Total Pages : 343 pages
Book Rating : 4.:/5 (386 download)

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Book Synopsis The Fluid Dynamics and Heat Trnsfer Effects of Streamwise Vortices Embedded in a Turbulent Boundary Layer by : Wayne Robert Pauley

Download or read book The Fluid Dynamics and Heat Trnsfer Effects of Streamwise Vortices Embedded in a Turbulent Boundary Layer written by Wayne Robert Pauley and published by . This book was released on 1988 with total page 343 pages. Available in PDF, EPUB and Kindle. Book excerpt:

An Experimental Investigation of Turbulent Heat Transport in a Boundary Layer with an Embedded Streamwise Vortex

Author : Donald Edward Wroblewski
Publisher :
ISBN 13 :
Total Pages : 670 pages
Book Rating : 4.:/5 (33 download)

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Book Synopsis An Experimental Investigation of Turbulent Heat Transport in a Boundary Layer with an Embedded Streamwise Vortex by : Donald Edward Wroblewski

Download or read book An Experimental Investigation of Turbulent Heat Transport in a Boundary Layer with an Embedded Streamwise Vortex written by Donald Edward Wroblewski and published by . This book was released on 1990 with total page 670 pages. Available in PDF, EPUB and Kindle. Book excerpt:

An Experimental Investigation of the Heat-transfer Effects of a Longitudinal Vortex Embedded in a Turbulent Boundary Layer

Author : Stanford University. Thermosciences Division. Thermosciences Division
Publisher :
ISBN 13 :
Total Pages : 276 pages
Book Rating : 4.F/5 ( download)

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Book Synopsis An Experimental Investigation of the Heat-transfer Effects of a Longitudinal Vortex Embedded in a Turbulent Boundary Layer by : Stanford University. Thermosciences Division. Thermosciences Division

Download or read book An Experimental Investigation of the Heat-transfer Effects of a Longitudinal Vortex Embedded in a Turbulent Boundary Layer written by Stanford University. Thermosciences Division. Thermosciences Division and published by . This book was released on 1985 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt:

On the Origin of Streamwise Vortices in a Turbulent Boundary Layer

Author : P. S. Jang
Publisher :
ISBN 13 :
Total Pages : 34 pages
Book Rating : 4.:/5 (227 download)

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Book Synopsis On the Origin of Streamwise Vortices in a Turbulent Boundary Layer by : P. S. Jang

Download or read book On the Origin of Streamwise Vortices in a Turbulent Boundary Layer written by P. S. Jang and published by . This book was released on 1985 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Several experiments have suggested that the streamwise vortices, with their accompanying low momentum streaks, in a turbulent boundary layer have a characteristic spanwise wavelength of approximately lambda (superscript + subscript z) = 100. A mechanism is proposed which selects a comparable spanwise wavelength and produces counterrotating streamwise vortices in a turbulent boundary layer. Examining the equations which describe the small deviation of the velocity field from its time-average, it is found that the Benney-Gustavsson resonance (Studies in Applied Mathematics 3, 1981) occurs with such a boundary layer velocity profile. It is shown that, as an integral part of this resonance, there is a mean secondary flow which has a spanwise wavelength lambda (superscript +, subscript z) = 90 and whose velocities exhibit a counter-rotating streamwise vortex structure. Keywords include: Turbulent boundary layer; Streamwise vortices; Low-speed streaks; Tollmien-Schlichting waves; vertical vorticity; Resonant interaction; and Weakly non-linear induced flow.

Numerical Simulation of Heat Transfer Enhancement Resulting from a Streamwise Vortex Embedded in Laminar and Turbulent Boundary Layer Flows

Download Numerical Simulation of Heat Transfer Enhancement Resulting from a Streamwise Vortex Embedded in Laminar and Turbulent Boundary Layer Flows PDF Online Free

Author : David Shan-Ming Wang
Publisher :
ISBN 13 :
Total Pages : 252 pages
Book Rating : 4.:/5 (319 download)

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Book Synopsis Numerical Simulation of Heat Transfer Enhancement Resulting from a Streamwise Vortex Embedded in Laminar and Turbulent Boundary Layer Flows by : David Shan-Ming Wang

Download or read book Numerical Simulation of Heat Transfer Enhancement Resulting from a Streamwise Vortex Embedded in Laminar and Turbulent Boundary Layer Flows written by David Shan-Ming Wang and published by . This book was released on 1994 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:

A Theoretical Study of Streamwise Vorticity Effects on the Heat Transfer in Compressible Boundary Layers

Author : George R. Inger
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (11 download)

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Book Synopsis A Theoretical Study of Streamwise Vorticity Effects on the Heat Transfer in Compressible Boundary Layers by : George R. Inger

Download or read book A Theoretical Study of Streamwise Vorticity Effects on the Heat Transfer in Compressible Boundary Layers written by George R. Inger and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Boundary Layer Flow Control by an Array of Ramp-Shaped Vortex Generators

Author : National Aeronautics and Space Adm Nasa
Publisher : Independently Published
ISBN 13 : 9781793967527
Total Pages : 34 pages
Book Rating : 4.9/5 (675 download)

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Book Synopsis Boundary Layer Flow Control by an Array of Ramp-Shaped Vortex Generators by : National Aeronautics and Space Adm Nasa

Download or read book Boundary Layer Flow Control by an Array of Ramp-Shaped Vortex Generators written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2019-01-13 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Flow field survey results for the effect of ramp-shaped vortex generators (VG) on a turbulent boundary layer are presented. The experiments are carried out in a low-speed wind tunnel and the data are acquired primarily by hot-wire anemometry. Distributions of mean velocity and turbulent stresses as well as streamwise vorticity, on cross-sectional planes at various downstream locations, are obtained. These detailed flow field properties, including the boundary layer characteristics, are documented with the primary objective of aiding possible computational investigations. The results show that VG orientation with apex upstream, that produces a downwash directly behind it, yields a stronger pair of streamwise vortices. This is in contrast to the case with apex downstream that produces a pair of vortices of opposite sense. Thus, an array of VG s with the former orientation, usually considered for film-cooling application, may also be superior for mixing enhancement and boundary layer separation control. (See CASI ID 20120009374 for Supplemental CD-ROM.) Zaman, K. B. M. Q. and Hirt, S. M. and Bencic, T. J. Glenn Research Center NASA/TM-2012-217437, E-18130

Liutex and Its Applications in Turbulence Research

Author : Chaoqun Liu
Publisher : Academic Press
ISBN 13 : 0128190248
Total Pages : 458 pages
Book Rating : 4.1/5 (281 download)

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Book Synopsis Liutex and Its Applications in Turbulence Research by : Chaoqun Liu

Download or read book Liutex and Its Applications in Turbulence Research written by Chaoqun Liu and published by Academic Press. This book was released on 2020-10-29 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt: Liutex and Its Applications in Turbulence Research reviews the history of vortex definition, provides an accurate mathematical definition of vortices, and explains their applications in flow transition, turbulent flow, flow control, and turbulent flow experiments. The book explains the term "Rortex" as a mathematically defined rigid rotation of fluids or vortex, which could help solve many longstanding problems in turbulence research. The accurate mathematical definition of the vortex is important in a range of industrial contexts, including aerospace, turbine machinery, combustion, and electronic cooling systems, so there are many areas of research that can benefit from the innovations described here. This book provides a thorough survey of the latest research in generalized and flow-thermal, unified, law-of-the-wall for wall-bounded turbulence. Important theory and methodologies used for developing these laws are described in detail, including: the classification of the conventional turbulent boundary layer concept based on proper velocity scaling; the methodology for identification of the scales of velocity, temperature, and length needed to establish the law; and the discovery, proof, and strict validations of the laws, with both Reynolds and Prandtl number independency properties using DNS data. The establishment of these statistical laws is important to modern fluid mechanics and heat transfer research, and greatly expands our understanding of wall-bounded turbulence. Provides an accurate mathematical definition of vortices Provides a thorough survey of the latest research in generalized and flow-thermal, unified, law-of-the-wall for wall-bounded turbulence Explains the term “Rortex as a mathematically defined rigid rotation of fluids or vortex Covers the statistical laws important to modern fluid mechanics and heat transfer research, and greatly expands our understanding of wall-bounded turbulence

Boundary Layer Flow Control by an Array of Ramp-Shaped Vortex Generators

Author : National Aeronaut Administration (Nasa)
Publisher :
ISBN 13 :
Total Pages : 32 pages
Book Rating : 4.6/5 (711 download)

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Book Synopsis Boundary Layer Flow Control by an Array of Ramp-Shaped Vortex Generators by : National Aeronaut Administration (Nasa)

Download or read book Boundary Layer Flow Control by an Array of Ramp-Shaped Vortex Generators written by National Aeronaut Administration (Nasa) and published by . This book was released on 2020-08-03 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: Flow field survey results for the effect of ramp-shaped vortex generators (VG) on a turbulent boundary layer are presented. The experiments are carried out in a low-speed wind tunnel and the data are acquired primarily by hot-wire anemometry. Distributions of mean velocity and turbulent stresses as well as streamwise vorticity, on cross-sectional planes at various downstream locations, are obtained. These detailed flow field properties, including the boundary layer characteristics, are documented with the primary objective of aiding possible computational investigations. The results show that VG orientation with apex upstream, that produces a downwash directly behind it, yields a stronger pair of streamwise vortices. This is in contrast to the case with apex downstream that produces a pair of vortices of opposite sense. Thus, an array of VG s with the former orientation, usually considered for film-cooling application, may also be superior for mixing enhancement and boundary layer separation control. (See CASI ID 20120009374 for Supplemental CD-ROM.) Zaman, K. B. M. Q. and Hirt, S. M. and Bencic, T. J. Glenn Research Center NASA/TM-2012-217437, E-18130 WBS 561581.02.08.03.47.06.03 VORTEX GENERATORS; VORTICITY; TURBULENT BOUNDARY LAYER; WIND TUNNEL TESTS; BOUNDARY LAYER SEPARATION; FLOW DISTRIBUTION; VELOCITY MEASUREMENT; UPSTREAM; DOWNWASH; LOW SPEED

The Effects of Streamwise Concave Curvature on Turbulent Boundary Layer Structure

Author : Albert H. Jeans
Publisher :
ISBN 13 :
Total Pages : 176 pages
Book Rating : 4.F/5 ( download)

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Book Synopsis The Effects of Streamwise Concave Curvature on Turbulent Boundary Layer Structure by : Albert H. Jeans

Download or read book The Effects of Streamwise Concave Curvature on Turbulent Boundary Layer Structure written by Albert H. Jeans and published by . This book was released on 1982 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: Concave curvature has a relatively large, unpredictable effect on turbulent boundary layers. Some, but not all previous studies suggest that a large-scale, stationary array of counter-rotating vortices exists within the turbulent boundary layer on a concave wall. The objective of the present study was to obtain a qualitative model of the flow field in order to increase our understanding of the underlying physics. A large free-surface water channel was constructed in order to perform a visual study of the flow. Streamwise components of mean velocity and turbulence intensity were measured using a hot film anemometer. The upstream boundary was spanwise uniform with a momentum thickness to radius of curvature of 0.05. Compared to flat wall flow, large-scale, randomly distributed sweeps and ejections were seen in the boundary layer on the concave wall. The sweeps appear to suppress the normal mechanism for turbulence production near the wall by inhibiting the bursting process. The ejections appear to enhance turbulence production in the outer layers as the low speed fluid convected from regions near the wall interacts with the higher speed fluid farther out. The large-scale structures did not occur at fixed spanwise locations, and could not be called roll cells or vortices. (Author).

Interaction Between a Vortex and a Turbulent Boundary Layer. Part 1: Mean Flow Evolution and Turbulence Properties

Author :
Publisher :
ISBN 13 :
Total Pages : 52 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis Interaction Between a Vortex and a Turbulent Boundary Layer. Part 1: Mean Flow Evolution and Turbulence Properties by :

Download or read book Interaction Between a Vortex and a Turbulent Boundary Layer. Part 1: Mean Flow Evolution and Turbulence Properties written by and published by . This book was released on 1987 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:

An Experimental Study of the Effect of Streamwise Vortices on Unsteady Turbulent Boundary-layer Separation

Author : William W. Humphreys
Publisher :
ISBN 13 :
Total Pages : 502 pages
Book Rating : 4.:/5 (386 download)

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Book Synopsis An Experimental Study of the Effect of Streamwise Vortices on Unsteady Turbulent Boundary-layer Separation by : William W. Humphreys

Download or read book An Experimental Study of the Effect of Streamwise Vortices on Unsteady Turbulent Boundary-layer Separation written by William W. Humphreys and published by . This book was released on 1988 with total page 502 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Boundary Layer Flow Control by an Array of Ramp-Shaped Vortex Generators

Author : Nasa Technical Reports Server (Ntrs)
Publisher : BiblioGov
ISBN 13 : 9781289168520
Total Pages : 36 pages
Book Rating : 4.1/5 (685 download)

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Book Synopsis Boundary Layer Flow Control by an Array of Ramp-Shaped Vortex Generators by : Nasa Technical Reports Server (Ntrs)

Download or read book Boundary Layer Flow Control by an Array of Ramp-Shaped Vortex Generators written by Nasa Technical Reports Server (Ntrs) and published by BiblioGov. This book was released on 2013-07 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Flow field survey results for the effect of ramp-shaped vortex generators (VG) on a turbulent boundary layer are presented. The experiments are carried out in a low-speed wind tunnel and the data are acquired primarily by hot-wire anemometry. Distributions of mean velocity and turbulent stresses as well as streamwise vorticity, on cross-sectional planes at various downstream locations, are obtained. These detailed flow field properties, including the boundary layer characteristics, are documented with the primary objective of aiding possible computational investigations. The results show that VG orientation with apex upstream, that produces a downwash directly behind it, yields a stronger pair of streamwise vortices. This is in contrast to the case with apex downstream that produces a pair of vortices of opposite sense. Thus, an array of VG s with the former orientation, usually considered for film-cooling application, may also be superior for mixing enhancement and boundary layer separation control.