Measurement of shear-stress distribution by liquid-crystal coating

N. Fujisawa; S. Funatani; S. Kosaka

doi:10.1117/12.509840

29 April 2003 Measurement of shear-stress distribution by liquid-crystal coating

N. Fujisawa, S. Funatani, S. Kosaka

Proceedings Volume 5058, Optical Technology and Image Processing for Fluids and Solids Diagnostics 2002; (2003) https://doi.org/10.1117/12.509840
Event: Optical Technology and Image Processing for Fluids and Solids Diagnostics 2002, 2002, Beijing, China

Abstract

In the present paper, a method for measuring the shear-stress distribution over a solid surface in a fluid flow is studied with a use of shear-sensitive liquid crystal coating. The color response of the liquid crystal coating is calibrated against the various shear stress magnitudes and directions using an experimental test section of laminar channel flow. The measurement of shear stress distribution is carried out with a use of two color CCD cameras situated side by side. The color to shear stress transformation is conducted by the analysis with use of relative hue as a calibration variable, which is a function of shear stress magnitudes and directions. The usefulness of this technique was confirmed by the measurement of shear stress distribution around a circular cylinder with small span.

Citation Download Citation

N. Fujisawa, S. Funatani, and S. Kosaka "Measurement of shear-stress distribution by liquid-crystal coating", Proc. SPIE 5058, Optical Technology and Image Processing for Fluids and Solids Diagnostics 2002, (29 April 2003); https://doi.org/10.1117/12.509840

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