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- W2892368308 abstract "Shear-banding of branched wormlike solutions is a topic of active investigation which has not been fully elucidated. Here, we surmise that flow-induced microstructuring in the shear banding regime is associated with spatial concentration gradients. The experiments focus on the flow-induced behavior of a CTAB/NaSal wormlike micellar system. A unique approach based on a microfluidic-spitter geometry, combined with particle-image velocimetry and high-speed video microscopy, is used to separate the streams flowing out from the core and the near wall zones of the microchannel. Here, we present the first direct experimental evidence of the correlation between phase separation and shear banding. By increasing the pressure-drop across a microcapillary, the onset of a grainy texture close to the wall, showing a flow-induced demixing effect, is observed. We use a splitter to measure effluent streams from the center and the near-wall zones in terms of viscosity, conductance and dry mass. We observe that phase-separation induced by the flow correlates with chemical concentration gradients. This confirms our hypothesis that shear-induced local de-mixing of the system is strongly related to chemical concentration gradients." @default.
- W2892368308 created "2018-09-27" @default.
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- W2892368308 date "2019-01-01" @default.
- W2892368308 modified "2023-09-30" @default.
- W2892368308 title "Flow-induced concentration gradients in shear-banding of branched wormlike micellar solutions" @default.
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- W2892368308 doi "https://doi.org/10.1016/j.jcis.2018.09.060" @default.
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