论文标题
观察到准二维超级流中可动的湍流
Observation of bistable turbulence in quasi-two-dimensional superflow
论文作者
论文摘要
限制在两个维度的湍流可以自发地在大尺度上发展顺序，违背了熵期望，并且与湍流在三个维度上形成了鲜明的对比，在三维中，非线性湍流过程作用以破坏大规模的顺序。在这项工作中，我们报告了在近二维通道中，超级流体\ 4He的稳态流中观察到异常湍流行为 - 一种具有消失的粘度和离散涡度的液体。令人惊讶的是，对于一系列实验参数，观察到湍流存在于两个双向状态。通过相反涡度流的大型区域的出现可以很好地解释这种双重性。
Turbulent flow restricted to two dimensions can spontaneously develop order on large scales, defying entropy expectations and in sharp contrast with turbulence in three dimensions where nonlinear turbulent processes act to destroy large-scale order. In this work we report the observation of unusual turbulent behavior in steady-state flow of superfluid \4He---a liquid with vanishing viscosity and discrete vorticity---in a nearly two-dimensional channel. Surprisingly, for a range of experimental parameters, turbulence is observed to exist in two bistable states. This bistability can be well explained by the appearance of large-scale regions of flow of opposite vorticity.
