On imperfect hot-wire resolution issues and their effect on mean quantities

Authors: Örlü, R., Fransson, J. H. M., Alfredsson, P.H.
Document Type: Book
Pubstate: Published
Journal: Advances in Turbulence XII, Springer Proceedings in Physics
Volume: 132   605-608
Year: 2009


Spatial averaging when measuring small scale turbulence is a well known problem when using hot-wire anemometry. However the literature—despite a few well known and often cited studies—is rather inconclusive and incomplete, since spatial resolution effects can also be obscured by Reynolds number effects. As long as the sensing part of the hot-wire is sufficiently small and can respond to changes to the highest frequencies encountered in the flow, the measurements are believed to be free from spatial and temporal resolution issues.