The first experimental evidence of the diffusive character of the phase variable which describes the position of the convective rolls is presented. To produce a phase modulation a small alternating flow in a slightly supercritical fluid layer is injected. With use of this method, the diffusion coefficient D_∥ concerning the propagation of phase disturbances parallel to the roll axis is measured.
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Wesfreid et al. (1980) studied this question.
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