Velocity, Intermittency, and Turbulence Intensity Measurements in the Boundary Layer of an Accelerated Flow PDF Download
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Author: Donald R. Boldman
Publisher:
ISBN:
Category : Anemometer
Languages : en
Pages : 44
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Book Description
Hot-wire anemometer for velocity, intermittancy, and turbulence intensity measurements in boundary layer of accelerated flow.
Author: Donald R. Boldman
Publisher:
ISBN:
Category : Anemometer
Languages : en
Pages : 44
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Book Description
Hot-wire anemometer for velocity, intermittancy, and turbulence intensity measurements in boundary layer of accelerated flow.
Author: Donald R. Boldman
Publisher:
ISBN:
Category :
Languages : en
Pages : 34
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Book Description
Author: Paul F. Brinich
Publisher:
ISBN:
Category : Boundary layer
Languages : en
Pages : 36
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Book Description
An analysis of time-mean-turbulent boundary layer velocity profiles measured in a rapidly accelerating flow suggests that the outer region of the velocity profiles consists of essentially inviscid, rotational flow. The extent of this inviscid outer region was observed in some cases to exceed 90 percent of what is ordinarily thought of as the turbulent boundary layer thickness. On the other hand, the inner frictional region of these velocity profiles appears to have turbulent characteristics similar to those of more conventional turbulent boundary layers. Hence, the outer edge boundary condition for this inner region is more properly the external rotational flow region than the free stream.
Author: Ching Jen Chen
Publisher: CRC Press
ISBN: 9780891165583
Category : Science
Languages : en
Pages : 884
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Book Description
Author: Peter Bradshaw
Publisher: Pergamon
ISBN:
Category : Science
Languages : en
Pages : 250
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Book Description
Author: Michael F. Blair
Publisher:
ISBN:
Category :
Languages : en
Pages : 219
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Book Description
A combined experimental and analytical program has been conducted to examine transitional, accelerating boundary layer flows with high levels of freestream turbulence. An earlier program focused on measurement of transitional heat transfer distributions for four combinations of streamwise acceleration and freestream turbulence. The present program was designed to document the boundary layer turbulence structure and spectral distributions for the same four test conditions. The results from the present program have shown that transition in accelerating flows consists of an acceleration dominated stage of slowly developing intermittency followed by a second stage with the same general characteristics as zero-pressure-gradient transition. Conditionally sampled fluctuating velocity profile measurements indicated that the boundary layer turbulence was highly anisotropic in the early stages of transition. Conditionally sampled mean velocity measurements showed that within the intermittent turbulent patches the mean velocity profiles were very similar to those of an equilibrium turbulent boundary layer. Spectral distribution data indicated that preferred amplification of the most unstable (as predicted by linear stability theory) frequencies occurred upstream of the onset of transitional bursting. In addition to the experimental portion of this investigation, numerical experiments were undertaken to assess the ability of currently existing methods to predict heat transfer during transition in accelerating flows.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 544
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Book Description
Author: Ralph John Volino
Publisher:
ISBN:
Category :
Languages : en
Pages : 408
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Book Description
Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1730
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Book Description
Author: G. Biswas
Publisher: CRC Press
ISBN: 9780849310140
Category : Technology & Engineering
Languages : en
Pages : 478
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Book Description
This book allows readers to tackle the challenges of turbulent flow problems with confidence. It covers the fundamentals of turbulence, various modeling approaches, and experimental studies. The fundamentals section includes isotropic turbulence and anistropic turbulence, turbulent flow dynamics, free shear layers, turbulent boundary layers and plumes. The modeling section focuses on topics such as eddy viscosity models, standard K-E Models, Direct Numerical Stimulation, Large Eddy Simulation, and their applications. The measurement of turbulent fluctuations experiments in isothermal and stratified turbulent flows are explored in the experimental methods section. Special topics include modeling of near wall turbulent flows, compressible turbulent flows, and more.
