Macroscopic circular and spiral phase wave propagation was observed for the first time in the rectangular pattern of electrohydrodynamic convection of nematic liquid crystal. The centers of the phase wave propagation were, in general, neither defects of the rectangular structure nor external heterogeneities. The power spectrum of the transmitted light locally measured exhibited two peaks, one a corresponding phase wave mode and the other an unentrained mode. The frequency of the phase wave mode was lower than that of the other mode.
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Nasuno et al. (1989) studied this question.
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