Measuring shear stress with a microfluidic sensor to improve aerodynamic efficiency

C. Hughes, D. Dutta, Y. Bashirzadeh, K. A. Ahmed, S. Qian

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Citations (Scopus)

Abstract

In aerodynamic structures, shear stress is the greatest contributor to a body’s total parasitic skin friction drag. This drag is proportional to the local wall shear stress on a surface. Measurement difficulties, high errors and the cost of fabrication have motivated innumerable efforts to develop precise and inexpensive methods for measuring the local shear stress in fluid structures. This is especially important in the supersonic aerodynamic environment, where the interaction between the sensor and air flow induces even higher errors. In order to further improve the efficiency of aircraft and other aerodynamic bodies, sensitive measurements on small scales are required. The present study introduces a novel electrochemical microfluidic shear stress sensor enabling the measurement of the wall shear stress in wind tunnel models. Our company proposes a paradigm shift in shear stress measurements which will take advantage of the complete sensing package offered in micro electro-mechanical systems (MEMS) without the need for moving mechanical parts or expensive manufacturing. The sensor contains a cavity, capped by a thin membrane. The air flow above the membrane deflects the membrane and induces fluid motion within the cavity, which accordingly changes the conductance of the electrolyte solution inside the cavity. This allows the direct measurement of the shear stress by measuring the electrical current under a fixed voltage applied. The proposed sensor is tested inside a subsonic wind tunnel at different air flow rates, using optical experiments and image processing techniques. These measurements enable the comparison of the shear stress measured by the sensor to that obtained by boundary layer measurements and cavity convection measurements. These results imply that the electrochemical shear stress sensor offers a precise and robust measurement system capable of quantifying wall shear stress in air flows.

Original languageEnglish (US)
Title of host publication53rd AIAA Aerospace Sciences Meeting
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624103438
DOIs
StatePublished - Jan 1 2015
Event53rd AIAA Aerospace Sciences Meeting, 2015 - Kissimmee, United States
Duration: Jan 5 2015Jan 9 2015

Publication series

Name53rd AIAA Aerospace Sciences Meeting

Conference

Conference53rd AIAA Aerospace Sciences Meeting, 2015
CountryUnited States
CityKissimmee
Period1/5/151/9/15

Fingerprint

Microfluidics
Shear stress
Aerodynamics
Sensors
Air
Membranes
Wind tunnels
Drag
Supersonic aerodynamics
Fluids
Skin friction
Stress measurement
Boundary layers
Image processing
Electrolytes
Aircraft
Flow rate
Fabrication
Electric potential

ASJC Scopus subject areas

  • Aerospace Engineering

Cite this

Hughes, C., Dutta, D., Bashirzadeh, Y., Ahmed, K. A., & Qian, S. (2015). Measuring shear stress with a microfluidic sensor to improve aerodynamic efficiency. In 53rd AIAA Aerospace Sciences Meeting [AIAA 2015-1919] (53rd AIAA Aerospace Sciences Meeting). American Institute of Aeronautics and Astronautics Inc, AIAA. https://doi.org/10.2514/6.2015-1919

Measuring shear stress with a microfluidic sensor to improve aerodynamic efficiency. / Hughes, C.; Dutta, D.; Bashirzadeh, Y.; Ahmed, K. A.; Qian, S.

53rd AIAA Aerospace Sciences Meeting. American Institute of Aeronautics and Astronautics Inc, AIAA, 2015. AIAA 2015-1919 (53rd AIAA Aerospace Sciences Meeting).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Hughes, C, Dutta, D, Bashirzadeh, Y, Ahmed, KA & Qian, S 2015, Measuring shear stress with a microfluidic sensor to improve aerodynamic efficiency. in 53rd AIAA Aerospace Sciences Meeting., AIAA 2015-1919, 53rd AIAA Aerospace Sciences Meeting, American Institute of Aeronautics and Astronautics Inc, AIAA, 53rd AIAA Aerospace Sciences Meeting, 2015, Kissimmee, United States, 1/5/15. https://doi.org/10.2514/6.2015-1919
Hughes C, Dutta D, Bashirzadeh Y, Ahmed KA, Qian S. Measuring shear stress with a microfluidic sensor to improve aerodynamic efficiency. In 53rd AIAA Aerospace Sciences Meeting. American Institute of Aeronautics and Astronautics Inc, AIAA. 2015. AIAA 2015-1919. (53rd AIAA Aerospace Sciences Meeting). https://doi.org/10.2514/6.2015-1919
Hughes, C. ; Dutta, D. ; Bashirzadeh, Y. ; Ahmed, K. A. ; Qian, S. / Measuring shear stress with a microfluidic sensor to improve aerodynamic efficiency. 53rd AIAA Aerospace Sciences Meeting. American Institute of Aeronautics and Astronautics Inc, AIAA, 2015. (53rd AIAA Aerospace Sciences Meeting).
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