The turbulent rotating-disk boundary layer
2014 (English)In: European journal of mechanics. B, Fluids, ISSN 0997-7546, E-ISSN 1873-7390, Vol. 48, 245-253 p.Article in journal (Refereed) Published
The turbulent boundary layer on a rotating disk is studied with the aim of giving a statistical description of the azimuthal velocity field and to compare it with the streamwise velocity of a turbulent two-dimensional flat-plate boundary layer. Determining the friction velocity accurately is particularly challenging and here this is done through direct measurement of the velocity distribution close to the rotating disk in the very thin viscous sublayer using hot-wire anemometry. Compared with other flow cases, the rotating-disk flow has the advantage that the highest relative velocity with respect to a stationary hot wire is at the wall itself, thereby limiting the effect of heat conduction to the wall from the hot-wire probe. Experimental results of mean, rms, skewness and flatness as well as spectral information are provided. Comparison with the two-dimensional boundary layer shows that turbulence statistics are similar in the inner region, although the rms-level is lower and the maximum spectral content is found at smaller wavelengths for the rotating case. These features both indicate that the outer flow structures are less influential in the inner region for the rotating case.
Place, publisher, year, edition, pages
2014. Vol. 48, 245-253 p.
Near-wall turbulence, Hot-wire anemometer, Skin friction
Fusion, Plasma and Space Physics
IdentifiersURN: urn:nbn:se:kth:diva-153238DOI: 10.1016/j.euromechflu.2014.03.009ISI: 000341549300023ScopusID: 2-s2.0-84951882787OAI: oai:DiVA.org:kth-153238DiVA: diva2:756110
QC 201410162014-10-162014-10-032015-01-19Bibliographically approved