Abstract
Abstract The selection of wavenumbers in roll convection has been studied experimentally. Roll flow of a given initial wavenumber, artificially induced in the middle of a chamber, is evolved freely in contact with a less ordered flow on both sides of the induction zpne. The induced rolls adjust their wavenumber to a physically optimal ( referred) value determined by the Rayleigh number. This process is mainly two-dimensional, nondiffusive and independent of the side walls. The preferred wavenumber seems to coincide with the mean wavenumber of steady roll flow observed in experiments with random initial disturbances, being apparently an inherent characteristic of cellular convection
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