Spatial Resolution Correction for Electrochemical Wall-shear Stress Measurements using Rectangular Sensors


1 Laboratory of Fluid Mechanics, EMP, BP 17 Bordj El Bahri, Alger, Algerie

2 LAMIH CNRS UMR 8201, UVHC, Univ. Lille Nord de France, F-59313, Valenciennes, France

3 Polytechnic University Hauts-de-France of Valenciennes, LAMIH UMR CNRS 8201, France


This article is mainly motivated by the growing needs for highly resolved measurements for wall-bounded turbulent flows and aims to proposes a spatial correction coefficient in order to increase the wall-shear stress sensors accuracy. As it well known for the hot wire anemometry, the fluctuating streamwise velocity measurement attenuation is mainly due to the spatial resolution and the frequency response of the sensing element. The present work agrees well with this conclusion and expands it to the wall-shear stress fluctuations measurements using electrochemical sensors and suggested a correction method based on the spanwise correlation coefficient to take into account the spatial filtering effects on unresolved wall-shear stress measurements due to too large sensor spanwise size.