Abstract
Theoretical analysis of vorticity disturbances in axisymmetric elongational flow of dilute polymer solutions shows that polymers decrease the vorticity near the symmetry axis and increase it away from this axis, at distances larger than the square root of the ratio betwen the kinematic viscosity and the strain rate of the fluid. Enhancement of large-scale vorticity is a consequence of elastic energy storage by macromolecules that inhibits the energy cascade towards the dissipative scales. A similar mechanism may be expected to play an important role in turbulence modification by polymers.
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