Transitions between patterns in thermal convection
- 25 November 1991
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 67 (22), 3078-3081
- https://doi.org/10.1103/physrevlett.67.3078
Abstract
We present experimental studies of the transitions between conduction, hexagons, and rolls in non-Boussinesq convection of gaseous in a cylindrical cell of radius-to-height ratio 86. Except for the transition from conduction to hexagons, transitions occur when the two states involved have nearly the same value of a generalized potential rather than at the stability limits. Conduction gives way to hexagons via the propagation of a front connecting the two states, while the transitions between hexagons and rolls are facilitated at the cell walls which appear to nucleate the minority state.
Keywords
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