New approaches in the measurement of shear stress and heat flux

Ali Etebari; Jerrod Ewing; Andrew Gifford; Barbar Akle; Thomas E. Diller; Pavlos Vlachos

doi:10.1117/12.660580

11 April 2006 New approaches in the measurement of shear stress and heat flux

Ali Etebari, Jerrod Ewing, Andrew Gifford, Barbar Akle, Thomas E. Diller, Pavlos Vlachos

Author Affiliations +

Proceedings Volume 6174, Smart Structures and Materials 2006: Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems; 61741W (2006) https://doi.org/10.1117/12.660580
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2006, San Diego, California, United States

Abstract

Novel designs of skin friction and heat flux sensors have been developed based on advanced materials and processing techniques. These sensors produce dynamic, time-resolved, direct measurements of skin friction and heat flux, especially tailored towards turbulent flows. The skin friction sensors use ionic polymer transducers, which contain no moving parts, directly measure shear, and can be surface mounted with minimal flow intrusion. The sensors exhibit measurement accuracy in fluctuating shear on the order of 4.92% over a range of stresses of +/- 3 Pa and signal-to-noise-ratio on the order of 60 dB. The frequency response of the sensor is on the order of 10 kHz. An approach for automatic recalibration and error compensation based on changes of impedance has been developed. This process allows in-situ recalibration of the sensors under varying temperature conditions. The heat flux sensors are made with thin-film deposition which allows fine arrays to be created. The measured Seebeck coefficient (temperature sensitivity) of the deposited metals is 23.5 μV/^oC, which closely matches that of bulk wire.

Citation Download Citation

Ali Etebari, Jerrod Ewing, Andrew Gifford, Barbar Akle, Thomas E. Diller, and Pavlos Vlachos "New approaches in the measurement of shear stress and heat flux", Proc. SPIE 6174, Smart Structures and Materials 2006: Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems, 61741W (11 April 2006); https://doi.org/10.1117/12.660580

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