Transition to spiral-defect chaos in low Prandtl number convection

Journal Article · Mon Jan 16 00:00:00 EST 1995 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.74.391· OSTI ID:6648181

Hu, Y; Ecke, R E; Ahlers, G ^[1]

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1. Materials Division and Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States) Department of Physics and Center for Nonlinear Science, University of California, Santa Barbara, California 93106 (United States)

We report a distinct transition at [epsilon][approx]0.55 from a state with dislocation defects to spiral-defect chaos in a Rayleigh-Benard system of aspect ratio [Gamma]=40. The transition occurred over a narrow range in [epsilon] and was seen in angle-time representations of azimuthal power spectra, in the spatially averaged roll curvature, in the skewness of the structure function, and in the roll-nucleation frequency of sidewall foci. Comparison with work by others shows that the onset of spiral-defect chaos moves to smaller [epsilon] as [Gamma] increases.

• OSTI ID: 6648181
• Journal Information: Physical Review Letters; (United States), Vol. 74:3; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
CONVECTION
ASPECT RATIO
AZIMUTH
CORRELATIONS
CYLINDERS
GRAIN BOUNDARIES
INSTABILITY
PHASE SHIFT
PRANDTL NUMBER
THERMAL DIFFUSIVITY
TIME-SERIES ANALYSIS
ENERGY TRANSFER
HEAT TRANSFER
MASS TRANSFER
MATHEMATICS
MICROSTRUCTURE
PHYSICAL PROPERTIES
THERMODYNAMIC PROPERTIES
420400* - Engineering- Heat Transfer & Fluid Flow