希薄な界面活性剤水溶液の粘弾性によるTaylor-Couette乱流における角運動量輸送の変調

抄録

Viscoelasticity of a dilute surfactant solution can drastically change the turbulent flow of water. This results in many differences in turbulent transport phenomena. We experimentally investigate the differences in the transfer of angular momentum in turbulent Taylor-Couette flow with an ultimately high Taylor number regime. We report the angular momentum transfer is suppressed in the counter-rotating regime. Furthermore, we found remarkable the enhancement of the wall frictional drag in the co-rotating regime while drag reduction was observed in the counter-rotating regime. Interestingly, a non-monotonical profile of the mean azimuthal velocity appears for the drag enhancement cases. The drag enhancement and non-monotonical velocity profile are coincident with a previous numerical investigation whereas some control parameters are quite different from our experiments.