108 citations · 490 across the 10 of their papers we have counts for
11 papers
Transient shear banding during startup flow: Insights from nonlinear simulations
Shweta Sharma, Yogesh M. Joshi, V. Shankar
We study the dynamics of shear startup of the Johnson-Segalman and non-stretching Rolie-Poly models using nonlinear simulations. We consider cases where the startup is from zero sh…
Viscoelasticity and Rheological Hysteresis
Shweta Sharma, V. Shankar, Yogesh M. Joshi
Rheological characterization of complex fluids subjected to cyclic shear-rate sweep often exhibits hysteresis. Since both viscoelastic and thixotropic materials show hysteresis loo…
Understanding viscoelastic flow instabilities: Oldroyd-B and beyond
Hugo A. Castillo Sanchez, Mihailo R. Jovanovic, Satish Kumar +4
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. Th…
Perspectives on viscoelastic flow instabilities and elastic turbulence
Sujit S. Datta, Arezoo M. Ardekani, Paulo E. Arratia +20
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 viscoelas…
Onset of transient shear banding in viscoelastic shear start-up flows: Implications from linearized dynamics
Shweta Sharma, V. Shankar, Yogesh M. Joshi
We analyze transient dynamics during shear start-up in viscoelastic flows between two parallel plates, with a specific focus on the signatures for the onset of transient shear band…
Distinguishing thixotropy from viscoelasticity
Mayank Agarwal, Shweta Sharma, V. Shankar +1
Owing to nonlinear viscoelasticity, materials often show characteristic features that resemble those of thixotropy. This issue has been debated in the literature over the past seve…
A continuous pathway between the elasto-inertial and elastic turbulent states in viscoelastic channel flow
Mohammad Khalid, V. Shankar, Ganesh Subramanian
We show that viscoelastic plane Poiseuille flow becomes linearly unstable in the absence of inertia, in the limit of high elasticities, for ultra-dilute polymer solutions. While in…
The center-mode instability of viscoelastic plane Poiseuille flow
Mohammad Khalid, Indresh Chaudhary, Piyush Garg +2
A modal stability analysis shows that plane Poiseuille flow of an Oldroyd-B fluid becomes unstable to a `center mode' with phase speed close to the maximum base-flow velocity, $U_{…
Transient start-up dynamics and shear banding in aging soft glassy materials: Rate-controlled flow field
Anika Jain, Ramanish Singh, Lakshmi Kushwaha +2
We study the transient start-up dynamics of a fluidity model which captures the rheological behavior of aging soft glassy materials, in a rectilinear shear flow upon application of…
Viscoelastic pipe flow is linearly unstable
Piyush Garg, Indresh Chaudhary, Mohammad Khalid +2
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…
Viscoelasticity of Dilute Solutions of Semiflexible Polymers
Matteo Pasquali, V. Shankar, David C. Morse
We show using Brownian dynamics simulations and theory how the shear relaxation modulus G(t) of dilute solutions of relatively stiff semiflexible polymers differs qualitatively fro…