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Investigations of Effects of Surface Temperature and Single Roughness Elements on Boundary-Layer TransitionThe laminar boundary layer and the position of the transition point were investigated on a heated flat plate. It was found that the Reynolds number of transition decreased as the temperature of the plate is increased. It is shown from simple qualitative analytical considerations that the effect of variable viscosity in the boundary layer due to the temperature difference produces a velocity profile with an inflection point if the wall temperature is higher than the free-stream temperature. This profile is confirmed by measurements. The instability of inflection-point profiles is discussed. Studies of the flow in the wake of large, two-dimensional roughness elements are presented. It is shown that a boundary-layer can separate and reattach itself to the wall without having transition take place.
Document ID
19930091958
Acquisition Source
Legacy CDMS
Document Type
Other
Authors
Liepmann, Hans W
Fila, Gertrude H
Date Acquired
September 6, 2013
Publication Date
January 1, 1947
Report/Patent Number
NACA-TR-890
Accession Number
93R21248
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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