On-o Intermittency in Stochastically Driven Electrohydrodynamic Convection in Nematics

On-off Intermittency in Stochastically Driven Electrohydrodynamic Convection in Nematics

On-off Intermittency in Electrohydrodynamic Convection in Nematics Driven by Multiplicative Noise

We report on-off intermittency in electroconvection of nematic liquid crystals driven by a dichotomous stochastic electric voltage. Above DC threshold with increasing voltage amplitude we observe laminar phases of undistorted director state interrupted by shorter bursts of regular stripes. Near a critical value of the amplitude the distribution of the duration of laminar phases is governed over...

Directed percolation criticality in turbulent liquid crystals.

We experimentally investigate the critical behavior of a phase transition between two topologically different turbulent states of electrohydrodynamic convection in nematic liquid crystals. The statistical properties of the observed spatiotemporal intermittency regimes are carefully determined, yielding a complete set of static critical exponents in full agreement with those defining the directe...

On electrically driven pattern-forming instabilities in planar nematics

2014 The theoretical description of the threshold and near-threshold behavior of electrohydrodynamic convection in nematic liquid crystals in the (low-frequency) conduction regime is reconsidered. We present essentially the full three-dimensional linear stability analysis of the basic state and a major part of the weaklynonlinear theory of the convective state. Boundary conditions at the upper ...

Laminar mixed convection of Cu-water nano-fluid in two- sided lid-driven enclosures

The fluid flow and heat transfer in lid-driven enclosures filled with Cu-water nanofluid is numerically investigated. The moving vertical walls of the enclosure  are maintained in a constant temperature, while the horizontal walls are insulated. The hybrid scheme is used to discretize the convection terms and SIMPLER algorithm is adopted to couple the velocity field and pressure in the momentum...