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Real time observations by neutron scattering of fluctuations near the Rayleigh-Bénard instability

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Zeitschrift für Physik B Condensed Matter

Abstract

Using long time-series counting in a neutron scattering experiment, hydrodynamic fluctuations were studied near the Rayleigh-Bénard instability in para-azoxyanisole. Critical enhancement was observed and the coupling to inner orientational fluctuations of the nematic liquid crystal was demonstrated through the response of the signal to an external magnetic field. The similarity of the experimental curves to those of critical scattering in equilibrium physics lends support to the phase-transition analogy of hydrodynamic instabilities.

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Authors and Affiliations

  1. Teknisk Data, Østensjøv. 39, Oslo 6, Norway

    Ann-Mari Pedersen

  2. Institutt for Atomenergi, P.O. Box 40, 2007, Kjeller, Norway

    Tormod Riste

Authors
  1. Ann-Mari Pedersen
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  2. Tormod Riste
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Additional information

Work performed in partial fullfilment of the cand.real.-degree at the Institute of Physics, University of Oslo

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Pedersen, AM., Riste, T. Real time observations by neutron scattering of fluctuations near the Rayleigh-Bénard instability. Z Physik B 37, 171–174 (1980). https://doi.org/10.1007/BF01365373

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  • DOI: https://doi.org/10.1007/BF01365373

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