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Direct Measurement Sensor of the Boundary Shear Stress in Fluid FlowThe 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.
Document ID
20150008575
Acquisition Source
Jet Propulsion Laboratory
Document Type
Conference Paper
External Source(s)
Authors
Badescu, Mircea
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Bao, Xiaoqi
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Bar-Cohen, Yoseph
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Chang, Zensheu
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Kerenyi, Kornel
(Federal Highway Administration McLean, VA, United States)
Lih, Shyh-Shiuh
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Sherrit, Stewart
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Trease, Brian P.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Widholm, Scott
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
May 20, 2015
Publication Date
March 7, 2010
Subject Category
Fluid Mechanics And Thermodynamics
Meeting Information
Meeting: SPIE Conference - Electroactive Polymer Actuators and Devices (EAPAD)
Location: San Diego, CA
Country: United States
Start Date: March 7, 2010
End Date: March 11, 2010
Sponsors: International Society for Optical Engineering
Funding Number(s)
OTHER: 82-13107
Distribution Limits
Public
Copyright
Other

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