2326 麹菌を培養した水溶液の抵抗減少効果(S42-5 複雑流体の流動現象(5),S42 複雑流体の流動現象)  [in Japanese] 2326 Drag Reduction of a Malted Rice Solution  [in Japanese]

We are studying drag-reducing biopolymers produced by malted rice. 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 2mm in diameter with the length of the test section of 100mm was carried out. The range of Reynolds number based on the viscosity of the solvent, tap water is from 500 to 8000. 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 a cloth filter. After the amylase was cultured for 48 hours maintaining it 35℃, the solutions were tested. We obtained about 30% in the maximum drag reduction ratio for a pipe friction.