Skin friction measurements on reflective surfaces using nematic liquid crystal |
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Authors: | D R Buttsworth S J Elston T V Jones |
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Institution: | (1) Faculty of Engineering and Surveying, University of Southern Queensland, Toowoomba, Qld, 4350, Australia, AU;(2) Department of Engineering Science, University of Oxford, UK, GB |
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Abstract: | A new liquid crystal technique for full surface skin friction measurements is introduced. With the new technique, the transmission
of light through nematic liquid crystal viewed in reflection provides a quantitative measurement of the skin friction. The
measurement technique is discussed with the aid of a model which describes the rotation dynamics of the liquid crystal molecules.
Calibration experiments performed in a laminar flow duct demonstrate that the model captures the essential physics of the
new technique. The measurement of skin friction downstream of a three dimensional roughness element in an incompressible laminar
boundary layer is then presented as a demonstration of the utility of the technique.
Received: 5 June 1998/Accepted: 13 November 1998 |
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