The Taylor-Couette motor: spontaneous flows of active polar fluids between two coaxial cylinders
The Taylor-Couette motor: spontaneous flows of active polar fluids between two coaxial cylinders
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DOI：
10.1088/1367-2630/14/2/023001
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发表时间：
2012-02-01
影响因子：
3.3
通讯作者：
Juelicher, F.
中科院分区：
文献类型：
--
作者：
Fuerthauer, S.;Neef, M.;Juelicher, F.
我们研究了Taylor-Couette几何中的主动极性流体的动力学，其中流体被限制在两个旋转的同轴圆柱体之间。该系统可以自发地产生流场，从而通过自发对称破缺或通过圆柱表面极化场的非对称边界条件使两个圆柱相对旋转。在存在外部施加的扭矩的情况下，该系统可以充当旋转马达并执行机械功。在一定的参数值和边界条件范围内，圆柱的相对角速度和外部施加的扭矩之间的关系表现出丰富的行为，如动态不稳定性和多个稳定的稳态共存。
We study the dynamics of active polar fluids in a Taylor-Couette geometry where the fluid is confined between two rotating coaxial cylinders. This system can spontaneously generate flow fields and thereby set the two cylinders into relative rotation either by spontaneous symmetry breaking or via asymmetric boundary conditions on the polarization field at the cylinder surfaces. In the presence of an externally applied torque, the system can act as a rotatory motor and perform mechanical work. The relation between the relative angular velocity of the cylinders and the externally applied torque exhibits rich behaviors such as dynamic instabilities and the coexistence of multiple stable steady states for certain ranges of parameter values and boundary conditions.