Stability of Bödewadt flow

Boundary-layer transition over a stationary disk in rotating flow is studied experimentally. Circular waves are observed in the boundary layer occurring on an end disk of a cylindrical cavity during impulsive spin-down to rest. The transient flow evolves into a quasi-steady regime that exhibits the properties of the Bodewadt flow. The circular waves develop in that flow. The critical Reynolds number Re = r (Ω/ v ) ½ is determined from frequency and wavelength measurements to be about 25. The corresponding dimensionless wavenumber 2π r /Λ Re is about 0.6 and the frequency 2π f / Ω i Re about 0.2.

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