Effect of High Levels of Free-stream Turbulence on Boundary Layer Skin Friction and Heat Transfer PDF Download
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Author: Donald M. Bott
Publisher:
ISBN:
Category :
Languages : en
Pages : 450
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Book Description
Author: Donald M. Bott
Publisher:
ISBN:
Category :
Languages : en
Pages : 450
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Book Description
Author: Stanford University. Thermosciences Division. Thermosciences Division
Publisher:
ISBN:
Category :
Languages : en
Pages : 62
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Book Description
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781723086397
Category :
Languages : en
Pages : 188
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Book Description
An experimental investigation of the transition process on flat-plate and concave curved-wall boundary layers for various free-streem turbulence levels was performed. Where possible, sampling according to the intermittency function was made. Such sampling allowed segregation of the signal into two types of behavior: laminar-like and turbulent-like. The results from the investigation are discussed. Documentation is presented in two volumes. Volume one contains the text of the report including figures and supporting appendices. Volume two contains data reduction program listings and tabulated data. Kim, J. and Simon, T. W. Unspecified Center BOUNDARY LAYER TRANSITION; CONCAVITY; FLAT PLATES; FREE FLOW; TURBULENCE EFFECTS; TURBULENT FLOW; WALL FLOW; CURVATURE; HEAT TRANSFER; SAMPLING; TURBULENCE...
Author: Peter Bradshaw
Publisher:
ISBN:
Category : Heat
Languages : en
Pages : 50
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Author: M. F. Blair
Publisher:
ISBN:
Category :
Languages : en
Pages : 193
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Book Description
In an earlier funded investigation, experimental research was conducted to deterine the influence of free-stream turbulence on turbulent boundary layer heat transfer and mean profile development. The data obtained under this earlier contract indicated that both the skin friction and the heat transfer increased significantly with increased free-stream turbulence level. Under the present investigation, detailed boundary layer turbulence structural data and turbulent heat transfer data were obtained for experimental test conditions and profile locations selected from the earlier test matrix. Numerious measurements assured that the present test conditions (boundary layer development and free-stream turbulence distributions) duplicated those of the earlier contract. The purposes for making these present detailed boundary layer turbulence measurements were: to provide data to which current finite-difference boundary layer turbulence models could be compared, and to generate a data base for the development of new analytical models for bondary layer heat transfer prediction. With the completion of the experimental portion of this investigation, a theoretical effort was made to assess the capability of a finite difference boundary layer computer program, ABLE (Analysis of the Boundary Layer Equations) for predicting the effect of free-stream turbulence on momentum and thermal boundary layers.
Author: Rama S. R. Gorla
Publisher:
ISBN:
Category : Fluid mechanics
Languages : en
Pages : 42
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Book Description
Author: Jungho Kim
Publisher:
ISBN:
Category :
Languages : en
Pages : 352
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Book Description
Author: Stanford University. Thermosciences Division. Thermosciences Division
Publisher:
ISBN:
Category :
Languages : en
Pages : 30
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Book Description
Author: Ding Wang
Publisher:
ISBN:
Category :
Languages : en
Pages : 714
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Book Description
Author: Donald M. Wilson
Publisher:
ISBN:
Category : Heat
Languages : en
Pages : 82
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Book Description
Turbulent boundary-layer heat transfer and skin-friction coefficients were measured on sharp slender cones at a free-stream Mach number of 5.0. Wall-to-stagnation temperature ratios from 0.15 to 0.80 were obtained by precooling or preheating the model. Tests were conducted for a wide range of Reynolds numbers by varying the tunnel supply pressure and temperature, thus providing data for naturally turbulent boundary layers. The experimental results were compared with existing theories which predict convective Stanton number or skin-friction coefficients. These comparisons indicate that the heat-transfer data are best predicted by the Spalding-Chi law and the skin friction by the Sommer-Short reference temperature method. The experimental Reynolds analogy factor is adequately predicted by Colburn's incompressible correlation for wall-to-stagnation temperature ratios above about 0.5. However, for lower wall temperature ratios, the experimental Reynolds analogy factor decreases with decreased temperature ratios in a manner which has not been previously reported. (Author).
