Spectral analysis of wall turbulence with photolithography devised electrochemical probes
Résumé
AN INCREASING attention has been devoted in the recent years
to the study of wall turbulence mainly because the succession
of events which lead to the fully developed turbulence takes
place near the wall. Unfortunately, only few experimental
methods can be successfully used in that region. Among
them, the electrochemical method appears as the most appropriate, enabling to measure the velocity gradient at the wall,
over a distance from the wall not exceeding some
micrometers [l-3].
The analysis of turbulent fluctuations can be done in
the framework of a linear theory if the ergodicity and the
stationarity of the time-dependent fluctuations can be
assumed.