Dynamics of a polymer under multi-gradient fields

Abstract

Effects of multi-gradient fields on the transport of a polymer chain have been investigated by using generalized Langevin dynamics simulations. We observe that the natural frequency of tumbling follows $W{i}^{0.66}$ scaling, where $Wi$ is the Weissenberg number. Analysis of angular tumbling time distribution reveals that the tail of distribution follows exponential distribution and at high Weissenberg number, deviates from Poisson behaviour. Competition between velocity gradient which results shear flow in the system, and solvent quality gradient arising due to the interaction among monomers revealed that there is another scaling associated with the angular tumbling time distribution. Moreover, at low temperature, we observe unusual behaviour that at intermediate shear rates, decay rate $\nu$ decreases with $Wi$.

References in corpus (13)

• Shearing active gels close to the isotropic-nematic transition
• Statistics of tumbling of a single polymer molecule in shear flow
• Anomalous thermodynamics at the micro-scale
• Polymers in linear shear flow: a numerical study
• Numerical study of polymer tumbling in linear shear flows
• Brownian transport in corrugated channels with inertia
• Flow of deformable droplets: discontinuous shear thinning and velocity oscillations
• Hard sphere fluids confined between soft repulsive walls: A comparative study using Monte Carlo and density functional methods
• Detectable inertial effects on Brownian transport through narrow pores
• Accurate statistics of a flexible polymer chain in shear flow
• Persistence of a Brownian particle in a Time Dependent Potential
• Sum rule for response function in nonequilibrium Langevin systems
• Single polymer gating of channels under a solvent gradient

Cited by in corpus (1)

• Transport and tumbling of polymers in viscoelastic shear flow