Elasto-inertial turbulence
Elasto-inertial turbulence
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DOI：
10.1073/pnas.1219666110
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发表时间：
2012-12
期刊：
影响因子：
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通讯作者：
D. Samanta;Y. Dubief;M. Holzner;C. Schäfer;A. Morozov;C. Wagner;B. Hof
中科院分区：
文献类型：
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作者：
D. Samanta;Y. Dubief;M. Holzner;C. Schäfer;A. Morozov;C. Wagner;B. Hof
湍流在自然界中无处不在，但即使是像水这样的普通牛顿流体，我们对这种现象的理解也是有限的。许多具有实际重要性的液体更复杂（例如，血液、聚合物熔体、油漆）;它们表现出弹性和粘性特性，并且应力和应变之间的关系是非线性的。在这里，我们证明了这种复杂的流体，在高剪切速率的模型系统，湍流不是简单地修改以前认为，但被抑制和取代的一种不同类型的无序运动，弹性惯性湍流。弹性惯性湍流被发现发生在比牛顿湍流低得多的雷诺数，和动力学性质显着不同。所观察到的摩擦缩放与所谓的“最大减阻”渐近线一致，这是由广泛的粘弹性流体所表现出的。
Turbulence is ubiquitous in nature, yet even for the case of ordinary Newtonian fluids like water, our understanding of this phenomenon is limited. Many liquids of practical importance are more complicated (e.g., blood, polymer melts, paints), however; they exhibit elastic as well as viscous characteristics, and the relation between stress and strain is nonlinear. We demonstrate here for a model system of such complex fluids that at high shear rates, turbulence is not simply modified as previously believed but is suppressed and replaced by a different type of disordered motion, elasto-inertial turbulence. Elasto-inertial turbulence is found to occur at much lower Reynolds numbers than Newtonian turbulence, and the dynamical properties differ significantly. The friction scaling observed coincides with the so-called “maximum drag reduction” asymptote, which is exhibited by a wide range of viscoelastic fluids.