Polymers dispersed in a turbulent flow alter the overall flow dynamics. The polymers exchange kinetic energy with the surrounding fluid; this energy can be accumulated as elastic energy, returned to the flow or dissipated by the polymers themselves. With the help of numerical simulations we are able to show the effect of polymers on the dynamics of a turbulent round jet. We find that large scales are dominated by inertial effects while small scales by elastic ones. The transition time scale separating these two regimes increases with the distance from the jet inlet.
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