Spiral-Defect Chaos in Rayleigh-B{acute e}nard Convection with Small Prandtl Numbers
Journal Article
·
· Physical Review Letters
- Department of Physics and Center for Nonlinear Science, University of California, Santa Barbara, California 93106 (United States)
Rayleigh-B{acute e}nard convection is investigated for Prandtl numbers {sigma} from 0.3 to 1.0 by using various pure gases and binary gas mixtures. The onset of spiral-defect chaos (SDC) moves to smaller values of {epsilon}{equivalent_to}{ital R}/{ital R}{sub {ital c}}{minus}1 ({ital R} is the Rayleigh number and {ital R}{sub {ital c}} its critical value) as {sigma} decreases. The measurements suggest that large-scale mean flows, which are expected to be stronger at smaller {sigma}, play an important role in the spontaneous generation of SDC.SDC can occur and fully develop in the regime dominated by the Soret effect. {copyright} {ital 1996 The American Physical Society.}
- DOE Contract Number:
- FG03-87ER13738
- OSTI ID:
- 388352
- Journal Information:
- Physical Review Letters, Vol. 77, Issue 15; Other Information: PBD: Oct 1996
- Country of Publication:
- United States
- Language:
- English
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