Piezoelectric bimorph bending sensor for shear-stress measurement in fluid flow

The measurement of shear stresses developed by a boundary layer is a fundamental problem of fluid dynamics. Knowing the mean shear stress and its fluctuations leads to a better description of the boundary layer and a better understanding of flow noise coupling. The shear stresses to be measured in a...

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Bibliographic Details
Published in:Sensors and actuators. A. Physical. 1996-07, Vol.55 (2-3), p.157-162
Main Authors: Roche, D., Richard, C., Eyraud, L., Audoly, C.
Format: Article
Language:English
Subjects:
Fluid flow
Piezoelectric bimorphs
Shear stress
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Summary:The measurement of shear stresses developed by a boundary layer is a fundamental problem of fluid dynamics. Knowing the mean shear stress and its fluctuations leads to a better description of the boundary layer and a better understanding of flow noise coupling. The shear stresses to be measured in a laminar or a turbulent flow amount to only a few pascal. The usual types of piezoelectric force sensors cannot perform this measurement with a satisfactory accuracy. The proposed sensor performs a direct measurement of shear stresses. It is composed of several piezoelectric bimorphs, which convert a very low force into a large amount of electrical charge. The typical device sensitivity is 200 nC N−1. Integrating the shear stresses on a surface of a few square centimetres allows shear stresses to be measured down to 1 Pa.
ISSN:0924-4247
1873-3069
DOI:10.1016/S0924-4247(97)80072-6