John Thomas, Behn Ulrich, Stannarius Ralf
Institut für Experimentelle Physik I, Fakultät für Physik und Geowissenschaften, Universität Leipzig, Linnéstrasse 5, D-04103 Leipzig, Germany.
Phys Rev E Stat Nonlin Soft Matter Phys. 2002 Apr;65(4 Pt 2A):046229. doi: 10.1103/PhysRevE.65.046229. Epub 2002 Apr 10.
Noise-driven electroconvection in sandwich cells of nematic liquid crystals exhibits on-off intermittent behavior at the onset of the instability. We study laser scattering of convection rolls to characterize the wavelengths and trajectories of the stochastic amplitudes of the intermittent structures. The pattern wavelengths and statistics of these trajectories are in quantitative agreement with simulations of the linearized electrohydrodynamic equations. The fundamental tau(-3/2) distribution law for the durations tau of laminar phases as well as the power law of the amplitude distribution of intermittent bursts are confirmed in the experiments. Power spectral densities of the experimental and numerically simulated trajectories are discussed.
向列型液晶夹层电池中由噪声驱动的电对流在不稳定性开始时表现出开-关间歇性行为。我们研究对流卷的激光散射，以表征间歇性结构随机振幅的波长和轨迹。这些轨迹的图案波长和统计数据与线性化电流体动力学方程的模拟结果在定量上一致。实验证实了层流阶段持续时间τ的基本τ^(-3/2)分布规律以及间歇性爆发振幅分布的幂律。讨论了实验和数值模拟轨迹的功率谱密度。
