Abstract
We investigate the first instability modes in the flow of aqueous high molecular weight polyethyleneoxide solutions in the Couette–Taylor system with rotating inner cylinder. For solutions with low concentrations or low molecular weight, the two first instability modes are the Taylor Vortex Flow and the Wavy Vortex Flow, as for Newtonian solutions. For solutions with higher concentrations or higher molecular weight, the first instability mode is instationary and non-axisymmetric: it occurs in form of strongly interacting counterpropagating waves. This mode evolves to turbulence for small values of the criticality. This behavior is associated with the solution viscoelasticity.
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