Purely elastic flow instabilities in microscale cross-slot devices.

  title={Purely elastic flow instabilities in microscale cross-slot devices.},
  author={Paulo de Tarso Costa de Sousa and Fernando Pinho and M{\'o}nica Oliveira and Manuel A. Alves},
  journal={Soft matter},
  volume={11 45},
We present an experimental investigation of viscoelastic fluid flow in a cross-slot microgeometry under low Reynolds number flow conditions. By using several viscoelastic fluids, we investigate the effects of the microchannel bounding walls and the polymer solution concentration on the flow patterns. We demonstrate that for concentrated polymer solutions, the flow undergoes a bifurcation above a critical Weissenberg number (Wi) at which the flow becomes asymmetric but remains steady. The… CONTINUE READING