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剪切稀化流体在通道流中由于弹性湍流引起的流动增强。

Flow enhancement due to elastic turbulence in channel flows of shear thinning fluids.

机构信息

Université de Bordeaux, CNRS, Solvay, LOF UMR 5258, Pessac 33600, France.

Université de Bordeaux, CNRS, LOMA UMR 5586, Talence 33501, France.

出版信息

Phys Rev Lett. 2015 Jan 16;114(2):028302. doi: 10.1103/PhysRevLett.114.028302. Epub 2015 Jan 15.

DOI:10.1103/PhysRevLett.114.028302
PMID:25635567
Abstract

We explore the flow of highly shear thinning polymer solutions in straight geometry. The strong variations of the normal forces close to the wall give rise to an elastic instability. We evidence a periodic motion close the onset of the instability, which then evolves towards a turbulentlike flow at higher flow rates. Strikingly, we point out that this instability induces genuine drag reduction due to the homogenization of the viscosity profile by the turbulent flow.

摘要

我们探索了高剪切稀化聚合物溶液在直线几何中的流动。靠近壁面的法向力的剧烈变化导致了弹性不稳定性。我们在不稳定性开始时发现了一种周期性的运动，然后在更高的流速下发展成类似湍流的流动。引人注目的是，我们指出这种不稳定性通过湍流使粘度分布均匀化而产生真正的减阻效果。

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