Scale-dependent enhancement and damping of vorticity disturbances by polymers in elongational flow

Yitzhak Rabin, Barbara J.A. Zielinska

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

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.

Original languageEnglish
Pages (from-to)512-515
Number of pages4
JournalPhysical Review Letters
Volume63
Issue number5
DOIs
StatePublished - 1989
Externally publishedYes

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