Spiral defect chaos in large aspect ratio Rayleigh-Bénard convection

We report experiments on convection patterns in a cylindrical cell with a large aspect ratio. The fluid had a Prandtl number [sigma][approx]1. We observed a chaotic pattern consisting of many rotating spirals and other defects in the parameter range where theory predicts that steady straight rolls s...

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Bibliographic Details
Published in:Physical review letters 1993-09, Vol.71 (13), p.2026-2029
Main Authors: MORRIS, S. W, BODENSCHATZ, E, CANNELL, D. S, AHLERS, G
Format: Article
Language:English
Subjects:
420400 - Engineering- Heat Transfer & Fluid Flow
ASPECT RATIO
Buoyancy-driven instability
Chaos
CONVECTION
DATA
ENERGY TRANSFER
ENGINEERING
Exact sciences and technology
EXPERIMENTAL DATA
Fluid dynamics
FLUID FLOW
Fundamental areas of phenomenology (including applications)
GEOMETRY
HEAT TRANSFER
HEATING
Hydrodynamic stability
INFORMATION
MASS TRANSFER
MATHEMATICS
NUMERICAL DATA
Physics
PRANDTL NUMBER
STOCHASTIC PROCESSES
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Summary:We report experiments on convection patterns in a cylindrical cell with a large aspect ratio. The fluid had a Prandtl number [sigma][approx]1. We observed a chaotic pattern consisting of many rotating spirals and other defects in the parameter range where theory predicts that steady straight rolls should be stable. The correlation length of the pattern decreased rapidly with increasing control parameter so that the size of a correlated area became much smaller than the area of the cell. This suggests that the chaotic behavior is intrinsic to large aspect ratio geometries.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.71.2026