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Article
Rotating-disk boundary-layer flow
| Authors: |
Imayama, S.I., Alfredsson, P.H., Lingwood, R. J. |
| Document Type: |
Conference |
| Pubstate: |
Published |
| Journal: |
Svenska Mekanikdagar, Lund, Sweden, June 12-14, 2013 |
| Volume: |
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| Year: |
2013 |
AbstractRotating-disk flow has been investigated not only as a simple model of cross-flow instability to compare with swept-wing flow but also for industrial flow applications with rotating configurations. About 28–32 stationary (in the rotating frame) convectively unstable cross-flow vortices are typically observed in the flow visualization
1, see as well as figure 1. However, the onset of transition is highly reproducible in various experimental facilities
2. Lingwood
3 found local absolute instability for a certain travelling disturbance above R = 507 which may have main responsible for the transition process, where Reynolds number R is defined as R = r
∗√(Ω
∗/ν
∗), where r
∗ is a local radius, Ω
∗ is a rotational speed, ν
∗ is a kinematic viscosity and ∗ denotes dimensional value. A main objective of this experimental study is to investigate to what extent the absolute instability is involved into laminar-turbulent transition of rotating-disk flow.
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