渦伸張流れにおける界面活性剤水溶液の渦抑制効果(流体工学, 流体機械)

抄録

Vortex stretching flow was investigated using an orifice-type and a rotating-nozzle device. The surfactant solutions showed remarkable vortex inhibition effect. It was indicated that the high resistance of the stretching flow for twisting shear produced the vortex inhibition. In the rotating-nozzle device, a core region of twisting shear appeared along the centerline. The method of viscometry was derived for the twisting shear in the nozzle core. In turbulent flow, the high resistance of the stretching flow for the twisting shear would have influence on energy cascade from large scale to small scale turbulence and have a close relationship to the suppression of transverse turbulence.