The dissolution of minute concentration of polymers in wall-bounded flows is well-known for
its unparalleled ability to reduce turbulent friction drag. Another phenomenon, elasto-inertial …

Polymer solutions are frequently used in enhanced oil recovery and groundwater
remediation to improve the recovery of trapped nonaqueous fluids. However, applications …

Viscoelastic fluids are a common subclass of rheologically complex materials that are
encountered in diverse fields from biology to polymer processing. Often the flows of …

The Oldroyd-B model has been used extensively to predict a host of instabilities in shearing
flows of viscoelastic fluids, often realized experimentally using polymer solutions. The …

It is presently believed that flows of viscoelastic polymer solutions in geometries such as a
straight pipe or channel are linearly stable. Here we present experimental evidence that …

Viscoelastic plane Poiseuille flow is shown to become linearly unstable in the absence of
inertia, in the limit of high elasticities, for ultradilute polymer solutions. While inertialess …

A modal stability analysis shows that plane Poiseuille flow of an Oldroyd-B fluid becomes
unstable to a 'centre mode'with phase speed close to the maximum base-flow velocity,. Our …

Newtonian pipe flow is known to be linearly stable at all Reynolds numbers. We report, for
the first time, a linear instability of pressure-driven pipe flow of a viscoelastic fluid, obeying …

The effect of viscoelasticity on the deformation of a circular drop suspended in a second
liquid in shear is investigated with direct numerical simulations. A numerical algorithm based …

The flow of viscoelastic fluids in channels and pipes remains poorly understood, particularly
at low Reynolds numbers. Here, we investigate the flow of polymeric solutions in straight …