Effect of Adhesive Tape on the Velocity Profile of Water

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I REPORT here an interesting discovery, made while investigating velocity profiles close to a solid boundary. The experiments were carried out in a 5 inch channel of square section filled with water to a depth of 4.5 inches. Total head and static head tubes constructed of hypodermic tubing (0.020 inches outside diameter; 0.010 inches inside diameter) were used to measure the head by means of a 0–5 inch water gauge transducer of differential transformer type. Experiments were performed in a region of fully developed turbulent flow in order to discover the effect on the velocity profile of roughening the channel bed by sticking sand grains of various known dimensions to it by means of double-sided ‘Scotch-Tape’.

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    Preston, J. H., J. Roy. Aero. Soc., 58 (February, 1954).

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COSSAR, A. Effect of Adhesive Tape on the Velocity Profile of Water. Nature 227, 1044 (1970) doi:10.1038/2271044a0

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