超音波によるTaylor渦固液二相流の速度と濃度計測の可能性について(非ニュートン,一般講演)

概要

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It is known that the effect of the Ekman boundary layer arises on the various modes in the structure and the generating number of Taylor vortex flows (TVF) with low aspect ratios. In this study, our purpose is to investigate the method to control a TVF with a small aspect ratio, for instance, by using magnetic fluids. Flow field of magnetic fluid under the magnetic field is investigated by numerical analysis and experimental measurement with ultrasound velocity profiler. The numerical model device has a radial ratio of 0.667, aspect ratio of 3 and the gap length between the inner and outer cylinders of 25mm. The magnetic field is applied to the flow field using coils put in electric current located on the outside of the vessel. The flow structure of magnetic fluid is controlled by the impressed magnetic field. From this result, it is impossible to change the vortex mode in Newtonian fluid after the steady mode is once formed, but the functional non-Newtonian fluid could change the vortex mode by using the external potential force, which result in the possibility of operation control in the system.
日本流体力学会の論文
2010-09-09