Figure 5
From: Heterogeneous flow inside threads of low viscosity fluids leads to anomalous long filament lifetimes
Time-dependent flow behavior of dilute surfactant solutions in planar extension. Results are shown for a 10 mM CTAB/NaSal, R = 0.5 solution in the OSCER. (a) Evolution of the flow field (top) as probed by dye imaging and birefringence (bottom) at an elongation rate of \(\dot{\varepsilon }=3\) s−1 and Re = 0.19. (Left) Images at start of experiment t = 0 s, (middle) time series plot across red lines and (right) at t = 150 s. Colors represent normalized intensities of the dye and qualitative birefringence. (b) Normalized velocity (left) with superimposed hyperbolic streamlines from PIV measurements, normalized intensity of FIB in the whole OSCER device (middle) and across x = 0 (right) at t = 32 s after the experiment started, for the same experimental conditions as in (a). (c) Critical time required for the onset of asymmetry breaking and critical total strain as a function of the applied elongation rate.
