Abstract
Flow Visualization technique was applied to measurement of the local wall shear stress with the aid of thermo-liquid-crystal. Two alignments of thermos-liquid-crystal, nichrome thin film and headed wall with micro-protrusion, were tested in a fully developed channel flow and calibration curves were obtained by given local skin friction coefficient. The wall temperature detected by color analysis of thermos-liquid-crystal at particular part on the wall can be correlated by 1/3 power of the local wall shear stress. Nichrome thin film type has wider rage for the wall shear stress measurement. Otherwise, heated wall with micro-proportion type is higher in sensitivity.
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