Ilzig Thomas, Stöckel Katharina, Odenbach Stefan
Chair of Magnetofluiddynamics, Measuring and Automation Technology, Dresden University of Technology, 01062 Dresden, Germany.
Materials (Basel). 2019 Dec 4;12(24):4027. doi: 10.3390/ma12244027.
Experimental investigations of propagating vortex flow states (V states) in a short Taylor-Couette system with asymmetric boundary conditions are presented. The flow state was established in a ferrofluid showing no magneto-viscous effect and was exposed to axial magnetic fields. It was found that the magnetic field led to a change in the spatial and temporal behavior of the V state, indicating complex interactions between the flow field and magnetic field. A stepwise applied axial magnetic field destabilized the V state, leading to an intermittent flow state. Gradually increasing the axial magnetic fields changed the temporal behavior of the regime. Up to magnetic field strengths of 20 kA/m, the orbital frequency, as a measure for the temporal periodicity, was increased with field strength.
本文给出了在具有不对称边界条件的短泰勒-库埃特系统中传播涡旋流态（V态）的实验研究。该流态在一种无磁粘性效应的铁磁流体中建立，并暴露于轴向磁场中。研究发现，磁场导致了V态的空间和时间行为发生变化，这表明流场和磁场之间存在复杂的相互作用。逐步施加轴向磁场会使V态失稳，导致出现间歇流态。逐渐增加轴向磁场会改变该状态的时间行为。在磁场强度达到20 kA/m之前，作为时间周期性度量的轨道频率随磁场强度增加。
