高分子水溶液の乱流境界層流れにおける抵抗低減効果と溶液作製時における高分子の機械的劣化の調査

抄録

Some polymers are highly susceptible to degradation caused by mechanical shear forces. This study focuses on the impact of stirring power during solution preparation on the turbulent drag reduction effect. PIV measurements of turbulent boundary layer flow were conducted to clarify the influence of stirring rotation numbers on drag reduction by injecting polymer solutions with different stirring rotation numbers. Extensional viscosity measurements were also performed to investigate the effect of mechanical degrada tion on the rheological properties of the polymers. Based on these insights, we investigated the relation between the mechanical degradation of polymers and their drag reduction effect.