Flow-induced structures versus flow instabilities.
Flow-induced structures versus flow instabilities.
复制标题
流动引起的结构与流动不稳定性。
DOI：
--
复制
发表时间：
2013
期刊：
影响因子：
--
通讯作者：
S. Manneville
中科院分区：
文献类型：
--
作者：
M. Fardin;C. Perge;Nicolas Taberlet;S. Manneville
泰勒-库埃特流的稀胶束系统已知产生剪切诱导的结构进行了研究，通过同时流变仪和超声成像。我们表明，流动不稳定性必须考虑到，因为雷诺数和韦森伯格数可能很大。在剪切诱导结构成核之前，流动可以是惯性不稳定的，但是一旦剪切诱导结构成核，流动的运动学就变得混乱，其模式让人想起在稀聚合物溶液中已知的弹性主导的湍流。我们概述了流动不稳定性和流动诱导结构之间的相互作用的一般框架。
The Taylor-Couette flow of a dilute micellar system known to generate shear-induced structures is investigated through simultaneous rheometry and ultrasonic imaging. We show that flow instabilities must be taken into account since both Reynolds and Weissenberg numbers may be large. Before nucleation of shear-induced structures, the flow can be inertially unstable, but once shear-induced structures are nucleated, the kinematics of the flow become chaotic, in a pattern reminiscent of the elastically dominated turbulence known in dilute polymer solutions. We outline a general framework for the interplay between flow instabilities and flow-induced structures.