On Poiseuille flow of liquid crystals

Simulations of liquid crystals in Poiseuille flow

Lattice Boltzmann simulations are used to explore the behavior of liquid crystals subject to Poiseuille flow. In the nematic regime at low shear rates we find two possible steady state configurations of the director field. The selected state depends on both the shear rate and the history of the sample. For both director configurations there is clear evidence of shear-thinning, a decrease in the...

Poiseuille flow and apparent viscosity of nematic liquid-crystals

In this work, we study the stationary Poiseuille flow of nematic liquidcrystals through a tube under a constant gradient pressure. We first examine the dynamics of steady-state system of Poiseuille flow with strong anchoring boundary conditions. For zero gradient pressure (equilibrium situation), the steady-state system can be converted essentially to a Hamiltonian system but it is not structur...

Orientational transition in nematic liquid crystals under oscillatory Poiseuille flow

We investigate the orientational behaviour of a homeotropically aligned nematic liquid crystal subjected to an oscillatory plane Poiseuille flow produced by an alternating pressure gradient. For small pressure amplitudes the director oscillates within the flow plane around the initial homeotropic position, whereas for higher amplitudes a spatially homogeneous transition to out-of-plane director...

On the instability of pipe Poiseuille flow

Stability of the flow of incompressible viscous fluid in a circular pipe is studied numerically. A perturbation consisting of finite-amplitude two-dimensional and infinitesimal three-dimensional parts is imposed on the basic flow. The temporal evolution of the perturbation is analyzed by direct numerical calculation of the Navier–Stokes equations. The two-dimensional disturbances are independen...

Comment on "photoalignment of liquid crystals by liquid crystals".