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首页> 外文期刊>The European physical journal, E. Soft matter >Direct and inverse pumping in flows with homogeneous and non-homogeneous swirl
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Direct and inverse pumping in flows with homogeneous and non-homogeneous swirl

机译：具有均匀和不均匀涡流的直接和反向泵送

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摘要

The conditions in which meridional recirculations appear in swirling flows above a fixed wall are analysed. In the classical Bodew?dt problem, where the swirl tends towards an asymptotic value away from the wall, the well-known "tea-cup effect" drives a flow away from the plate at the centre of the vortex. Simple dimensional arguments applied to a single vortex show that if the intensity of the swirl decreases away from the wall, the sense of the recirculation can be inverted, and that the associated flow rate scales with the swirl gradient. If the flow is quasi-2D, the classical tea-cup effect takes place. This basic theory is confirmed by numerical simulations of a square array of steady, electrically driven vortices. Experiments in the turbulent regimes of the same configuration reveal that these mechanisms are active in the average flow and in its fluctuating part. These mechanisms provide an explanation for previously observed phenomena in electrolyte flows. They also put forward a possible mechanism for the generation of helicity in flows close to two-dimensionality, which plays a key role in the transition between 2D and 3D turbulence. Graphical abstract: [Figure not available: see fulltext.]
机译：分析了在固定壁上方的旋流中出现子午环流的情况。在经典的Bodew？dt问题中，旋涡趋向于远离壁渐近值，众所周知的“茶杯效应”使流动远离涡旋中心处的板。应用于单个涡旋的简单尺寸论证表明，如果涡流的强度远离壁面而减小，则再循环的感觉可以反转，并且相关的流速与涡流梯度成比例。如果流量为准2D，则会发生经典的茶杯效应。这一基本理论已通过对稳定的电动涡流的方形阵列进行数值模拟得到了证实。在相同构造的湍流状态下进行的实验表明，这些机制在平均流量及其波动部分均有效。这些机制为先前观察到的电解液流动现象提供了解释。他们还提出了一种可能的机制，用于在接近二维的流中生成螺旋度，这在2D和3D湍流之间的转换中起着关键作用。图形摘要：[该图不可用：请参见全文。]

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