A MEMS surface fence sensor for wall shear stress measurement in turbulent flow areas

Papen, Tilmann von; Ngo, Ha-Duong; Obermeier, Ε.; Schöber, Martin; Pirskawetz, Stephan; Fernholz, H. H.

doi:10.1007/978-3-642-59497-7_342

Cited by 6 publications

(1 citation statement)

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“…Unfortunately, details on the flow calibration are not provided other than to state the calibration was conducted in a known flow in a reference wind tunnel. [8][9][10][11] An important consideration in the use and design of any device based on an obstruction to the flow is for it not to alter the flow field. These type devices have similar issues with the validity of a calibration extending to the actual use of the sensor.…”

Section: American Institute Of Aeronautics and Astronauticsmentioning

confidence: 99%

The Need for a Shear Stress Calibration Standard (Invited)

Scott

2004

24th AIAA Aerodynamic Measurement Technology and Ground Testing Conference

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By surveying current research of various micro-electro mechanical systems (MEMS) shear stress sensor development efforts we illustrate the wide variety of methods used to test and characterize these sensors. The different methods of testing these sensors make comparison of results difficult in some cases, and also this comparison is further complicated by the different formats used in reporting the results of these tests. The fact that making these comparisons can be so difficult at times clearly illustrates a need for standardized testing and reporting methodologies. This need indicates that the development of a national or international standard for the calibration of MEMS shear stress sensors should be undertaken. As a first step towards the development of this standard, two types of devices are compared and contrasted. The first type device is a laminar flow channel with two different versions considered: the first built with standard manufacturing techniques and the second with advanced precision manufacturing techniques. The second type of device is a new concept for creating a known shear stress consisting of a rotating wheel with the sensor mounted tangentially to the rim and positioned in close proximity to the rim. The shear stress generated by the flow at the sensor position is simply τ = µ rω /h, where µ is the viscosity of the ambient gas, r the wheel radius, ω the angular velocity of the wheel, and h the

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Section: American Institute Of Aeronautics and Astronauticsmentioning

confidence: 99%