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Istituto sull'inquinamento atmosferico

Torna all'elenco Contributi in rivista anno 2015

Contributo in rivista

Tipo: Articolo in rivista

Titolo: Anomalous Scaling, Intermittency and Turbulence in Nematic Liquid Crystals

Anno di pubblicazione: 2015

Formato: Elettronico

Autori: Carbone, F.; Ciuchi, F.; Mazzulla, A.; Sorriso-Valvo, L.

Affiliazioni autori: CNR Licryl; Univ Calabria Polifunz; University of Calabria; Excellence Ctr CEMIF CAL

Autori CNR:

  • FEDERICA CIUCHI
  • ALFREDO MAZZULLA
  • LUCA SORRISO VALVO

Lingua: inglese

Abstract: Turbulent electro-convective fluctuations induced in nematic liquid crystal (NLC) by an external oscillating electric field application are studied. Electrohydrodinamic instabilities, including chaotic dynamics and irregular pattern formation, are induced by electrical forces coupled to the flow, the conductivity and the bulk forces acting on the volume charges. In particular we investigate the scaling behavior of the probability density function (PDFs) of intensity fluctuations in a NLC driven through different regimes far from the cell plates, by using the confocal fluorescence microscopy technique. Both spectral properties and scaling behavior of light intensity fluctuations PDFs are analysed at different voltages. In weak turbulent regime, for intermediate voltages, PDFs are Gaussian at large scales, while show enhanced wings at smaller scales, showing the typical intermittency of the isotropic fluid flows. At higher voltages complex dynamical scattering regimes take place. A quantitative estimation of intermittency is obtained by PDFs modeling through the Castaing distribution, and structure functions are calculated in the framework of Extended Self-Similarity. Generation of small-scale fluctuations through a fragmentation process of large-scale structures are supported by the results. Moreover, the lingering anisotropic properties of the fluctuations are highlighted by the outcomes.

Lingua abstract: inglese

Pagine da: 67

Pagine a: 85

Pagine totali: 19

Rivista:

Molecular crystals and liquid crystals Taylor and Francis, Inc.
Paese di pubblicazione: Stati Uniti d'America
Lingua: inglese
ISSN: 1542-1406

Numero volume: 614

Numero fascicolo: 1

DOI: 10.1080/15421406.2015.1049911

Referee: Sė: Internazionale

Stato della pubblicazione: Published version

Indicizzato da:

  • ISI Web of Science (WOS) [000359722500009]
  • Scopus [2-s2.0-84939485955]

Parole chiave:

  • liquid crystals
  • hydrodynamics
  • statistical physics and nonlinear dynamics
  • Turbulent flows

Strutture CNR:

 
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