Abstract
The conditions of stable flow disturbance in viscoelastic media are discussed on the basis of similarity theory. In contrast to the usualReynolds number indicating the beginning of inertia turbulence an elastic turbulence criterion determining the stability conditions as depending upon the interrelation between the elasticity force and viscous friction acting in the flow is introduced. It is illustrated, by analysis of the capillary flow of such visco-elastic media as polymer melts, that the elastic turbulence criterion makes it possible to describe correctly the occurrence of unstable flow. It is shown that in such cases the relaxation behaviour of polymer melts can be expressed by a single relaxation time value.
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