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 …

Drug delivery systems (DDSs) are a promising avenue for targeted drug delivery over a
given time frame. Different techniques have been devised for drug encapsulation in a …

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 …

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 …

This paper is an pedagogical essay on the scenario of the instabilities and the transition to
turbulence in visco-elastic polymer flows. When polymers are long, they get easily stretched …

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 …

A modal stability analysis shows that pressure-driven pipe flow of an Oldroyd-B fluid is
linearly unstable to axisymmetric perturbations, in stark contrast to its Newtonian counterpart …

When subjected to sufficiently strong velocity gradients, solutions of long, flexible polymers
exhibit flow instabilities and chaotic motion, often referred to as elastic turbulence. Its …