31 March 2010 Direct measurement sensor of the boundary shear stress in fluid flow
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The flow fields and boundary erosion that are associated with scour at bridge piers are very complex. Direct measurement of the boundary shear stress and boundary pressure fluctuations in experimental scour research has always been a challenge and high spatial resolution and fidelity have been almost impossible. Most researchers have applied an indirect process to determine shear stress using precise measured velocity profiles. Laser Doppler Anemometry and Particle Image Velocimetry are common techniques used to accurately measure velocity profiles. These methods are based on theoretical assumptions to estimate boundary shear stress. In addition, available turbulence models cannot very well account for the effect of bed roughness which is fundamentally important for any CFD simulation. The authors have taken on the challenge to advance the magnitude level to which direct measurements of the shear stress in water flow can be performed. This paper covered the challenges and the efforts to develop a higher accuracy and small spatial resolution sensor. Also, preliminary sensor designs and test results are presented.
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Mircea Badescu, Mircea Badescu, Xiaoqi Bao, Xiaoqi Bao, Yoseph Bar-Cohen, Yoseph Bar-Cohen, Zensheu Chang, Zensheu Chang, Kornel Kerenyi, Kornel Kerenyi, Shyh-Shiuh Lih, Shyh-Shiuh Lih, Stewart Sherrit, Stewart Sherrit, Brian P. Trease, Brian P. Trease, Beck Chen, Beck Chen, Scott Widholm, Scott Widholm, } "Direct measurement sensor of the boundary shear stress in fluid flow", Proc. SPIE 7647, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2010, 76471C (31 March 2010); doi: 10.1117/12.847325; https://doi.org/10.1117/12.847325

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