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Effect of Wall Temperature on Roughness Induced Attachment-Line TransitionAn experiment on a cooled swept cylinder in a low-disturbance Mach 1.6 wind tunnel is described. The flow attachment line is disturbed by trip wires of varying size and the laminar/turbulent state of the downstream boundary layer is determined with a hot wire. The results demonstrate that although cooling the wall increases the stability of the boundary layer, it promotes roughness induced transition. Analysis of the data suggests that the attachment- line Reynolds number can account for the effect of wall cooling if the viscosity is evaluated at a particular reference temperature.
Document ID
20010026759
Acquisition Source
Ames Research Center
Document Type
Preprint (Draft being sent to journal)
Authors
Dietz, Anthony (MCAT Inst. Moffett Field, CA United States)
Coleman, Colin (NASA Ames Research Center Moffett Field, CA United States)
Laub, Jim (NASA Ames Research Center Moffett Field, CA United States)
Poll, D. I. A. (Cranfield Univ. Bedford, United Kingdom)
Nixon, David
Date Acquired
September 7, 2013
Publication Date
January 1, 1999
Subject Category
Fluid Mechanics And Thermodynamics
Meeting Information
Meeting: IUTAM Symposium on Laminar Turbulent Transition
Location: Sedona, AZ
Country: United States
Start Date: September 13, 1999
End Date: September 17, 1999
Sponsors: International Union of Theoretical and Applied Mechanics.
Funding Number(s)
PROJECT: RTOP 519-20-22
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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