麹菌を添加した水溶液の抵抗減少効果(OS.13 溶液・分散系のマイクロ・ナノ構造と流れの相互作用)

概要

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In this work, the turbulent drag reduction of a circular pipe flow was observed in aqueous malted rice solutions. In the experiment, the measurement of the pressure drop in a smooth pipe 2 mm in diameter with the length of the test section of 100 mm was carried out. The fully developed flow was obtained at the inlet of the test pipe. The experimental apparatus consisted of a piston cylinder with a variable piston speed and the test pipe section. The velocity of the piston with a constant-flow rate supply system changes the flow rate. The range of Reynolds number based on the viscosity of the solvent, tap water is approximately 900〜15000. The pressure drop was measured by means of a minute pressure transducer. We soaked the drying malted rice in tap water for about one hour, and then double the amount of tap water was added into the solutions. The malted rice solutions were filtered out by means of a cloth. After the amylase was cultured for 48 hours maintaining it 36℃, the solutions were tested. The maximum drag reduction ratio was about 40% obtained in the turbulent range.
2004-03-03