Elastic instability in stratified core annular flow

Details Elastic instability in stratified core annular flow Elastic instability in stratified core annular flow

2010-10-30

arxiv.org/abs/1011.0039v1

Physics

Fluid Dynamics

4 pages, 4 figures

Scientific paper

We study experimentally the interfacial instability between a layer of dilute polymer solution and water flowing in a thin capillary. The use of microfluidic devices allows us to observe and quantify in great detail the features of the flow. At low velocities, the flow takes the form of a straight jet, while at high velocities, steady or advected wavy jets are produced. We demonstrate that the transition between these flow regimes is purely elastic -- it is caused by viscoelasticity of the polymer solution only. The linear stability analysis of the flow in the short-wave approximation captures quantitatively the flow diagram. Surprisingly, unstable flows are observed for strong velocities, whereas convected flows are observed for low velocities. We demonstrate that this instability can be used to measure rheological properties of dilute polymer solutions that are difficult to assess otherwise.

Affiliated with

Also associated with

No associations

Rating

Elastic instability in stratified core annular flow does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Elastic instability in stratified core annular flow, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Elastic instability in stratified core annular flow will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-405116