Stretching of polymers in a random three-dimensional flow.
Alex Groisman,Victor Steinberg +1 more
TLDR
Behavior of a dilute polymer solution in a random three-dimensional flow with an average shear is studied experimentally and indicates that the polymer molecules are strongly stretched by the random motion of the fluid.Abstract:
Behavior of a dilute polymer solution in a random three-dimensional flow with an average shear is studied experimentally Polymer contribution to the shear stress is found to be more than 2 orders of magnitude higher than in a laminar shear flow The results indicate that the polymer molecules are strongly stretched by the random motion of the fluidread more
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Elastic turbulence in curvilinear flows of polymer solutions.
Alex Groisman,Victor Steinberg +1 more
TL;DR: Groisman and Steinberg as discussed by the authors presented an extended account of experimental observations of elasticity-induced turbulence in three different systems: a swirling flow between two plates, a Couette-Taylor (CT), and a flow in a curvilinear channel.
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Path-integral analysis of fluctuation theorems for general Langevin processes
TL;DR: In this article, the effects of non-conservative forces that violate detailed balance and non-autonomous dynamics arising from the variation of an external parameter were examined under the unifying framework of Langevin dynamics.
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Chaotic flow and efficient mixing in a microchannel with a polymer solution
TL;DR: It is shown that truly chaotic flow can be generated in a smooth microchannel of a uniform width at arbitrarily low Re, if a small amount of flexible polymers is added to the working liquid.
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Spectra of turbulence in dilute polymer solutions
A. Fouxon,Vladimir Lebedev +1 more
TL;DR: In this article, power-law spectra of velocity were established for dilute polymer solutions when polymers are strongly stretched by the flow, and such spectra were not associated with a flux of a conserved quantity, in two cases.
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Elastic turbulence in von Karman swirling flow between two disks
TL;DR: In this paper, the role of elastic stress in the statistical properties of elastic turbulence, realized by the flow of a polymer solution between two disks, is discussed, and the following features are confirmed experimentally and presented in this paper: (i) the rms of the vorticity (and that of velocity gradients) saturates in the bulk of elastic turbulent flow, leading to the saturation of the elastic stress.