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Experimental study of a wall shear stress sensor based on a porous element

✍ Scribed by Z. Y. Wang

Publisher
Springer
Year
1993
Tongue
English
Weight
683 KB
Volume
14
Category
Article
ISSN
0723-4864

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✦ Synopsis

The paper presents a new type of local wall shear stress sensor made of a high-porosity material with filter grade 40 p.m. The pressure variation caused by the shear stress acting on the surface can be transferred in this porous material, while the effect of the momentum change of the fluid is eliminated. Having neither protrusions nor cavities on the wall surface, the sensor presents little disturbance of the measured boundary layer. A pressure difference reading of the sensor is directly proportional to the local wall shear stress z and the wall shear stress can be written as z = CAP. The present investigation also deals with problems of sensor design and its influence on the performance of the sensor.

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