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An experiment on the stability of convection rolls with varying wave-number is described in extension of the earlier work by Chen in the ‘cross-roll instability’ rolls emerge at right angles to the original rolls. At Rayleigh numbers above 23,000 rolls are unstable for all wave-numbers and are replaced by a three-dimensional form of stationary convection for which the name ‘bimodal convection’ is proposed.
Busse et al. (Mon,) studied this question.
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