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首页> 外文期刊>The European physical journal, E. Soft matter >Experimental analysis of intermittency in electrohydrodynamic instability
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Experimental analysis of intermittency in electrohydrodynamic instability

机译：电流体动力不稳定性间歇性的实验分析

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摘要

The properties of turbulent electroconvective fluctuations generated in a nematic liquid crystal under the action of an external oscillating electric field are investigated. In particular, the spectral properties and the scaling behaviour of probability density functions (PDFs) of light intensity fluctuations are considered at different voltages. At intermediate voltage, in the weak turbulent regime, PDFs are Gaussian at large scales and show increasingly enhanced wings at smaller scales, recalling the typical signature of intermittency in isotropic fluid flows. When the voltage is increased, dynamical scattering regimes appear, characterized by increasing complexity. In order to get a quantitative estimate of intermittency, PDFs are modeled through the Castaing distribution, and structure functions are estimated in the framework of Extended Self-Similarity. Results support the generation of small-scale fluctuations through a fragmentation process of large-scale structures. The persistent anisotropic properties of the fluctuations are highlighted by the results.
机译：研究了向列液晶在外部振荡电场的作用下产生的湍流对流波动的性质。特别地，在不同电压下考虑光强度波动的光谱特性和概率密度函数（PDF）的缩放行为。在中等电压下，在弱湍流状态下，PDF在大尺度上是高斯分布，在小尺度上显示出越来越大的机翼，让人回想起各向同性流体流动中间歇性的典型特征。当电压增加时，出现动态散射状态，其特征是复杂性增加。为了获得对间歇性的定量估计，通过Castaing分布对PDF进行建模，并在扩展自相似性框架内估计结构函数。结果支持通过大型结构的碎片化过程产生小规模的波动。结果突出表明了波动的持久各向异性。

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