External Modulation of Rayleigh-Bénard Convection
- 23 November 1987
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 59 (21) , 2431-2434
- https://doi.org/10.1103/physrevlett.59.2431
Abstract
We report thermal-convection experiments using helium I where the vertical temperature difference has an externally imposed time dependence. Both positive and negative threshold shifts are observed depending on the strength and rate of modulation, as well as a depression of the initial slope of the heat transfer above threshold, in qualitative agreement with predictions of Ahlers, Hohenberg, and Lücke and of Rosenblat and Herbert.Keywords
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