论文标题
冠层弹性湍流：在细长的微型床床中自发形成波
Canopy elastic turbulence: spontaneous formation of waves in beds of slender microposts
论文作者
论文摘要
在聚合物支柱的微流体冠层上的粘弹性流中，我们报告了与周围流动相比，低流速的传播区域形式的波的自发出现。波的发生是混乱的，并显示出弹性湍流的特征。我们通过结合柱子的流动率实验和柱子的高速跟踪，系统地研究低速波与微流体冠层之间的耦合。波形成一个角度$β$，其主要流动方向取决于支柱阵列的几何形状。如果冠层由柔性结构组成，则波浪的通过以使人联想到植被顶部的惯性湍流中观察到的Monami波的出现的方式将结构偏转。由于与经典（惯性）冠层湍流的类比，我们将新观察的现象称为冠层弹性湍流。
In a viscoelastic flow over a microfluidic canopy of polymeric pillars, we report the spontaneous emergence of waves in the form of propagating regions of low flow velocity compared to the surrounding flow. The occurrence of the wave is chaotic and shows characteristics of elastic turbulence. We systematically study the coupling between the low velocity wave and the microfluidic canopy by combining flow velocimetry experiments and high speed tracking of the pillars. The waves form an angle $β$ with the primary flow direction that depends on the geometry of the pillar array. If the canopy is composed of flexible structures, the passage of a wave deflects the structures locally in a manner reminiscent of the emergence of the Monami waves observed in inertial turbulence over canopies of vegetation. Due to the analogies with classical (inertial) canopy turbulence, we name our newly-observed phenomenon as canopy elastic turbulence.
