Square Patterns in Rayleigh-Benard Convection with Rotation about a Vertical Axis

Journal Article · Wed Jul 01 04:00:00 EDT 1998 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.81.806· OSTI ID:665026

Bajaj, K M; Liu, J; Naberhuis, B; Ahlers, G ^[1]

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1. Department of Physics and Center for Nonlinear Science, University of California, Santa Barbara, California 93106 (United States)

We present experimental results for Rayleigh-Benard convection with rotation about a vertical axis at dimensionless rotation rates 0{le}{Omega}{le}250 and {epsilon}{equivalent_to}{Delta}T/{Delta}T{sub c}{minus}1{approx_lt}0.2 . Critical Rayleigh numbers and wave numbers agree with predictions of linear-stability analysis. For {Omega}{approx_gt}70 and small {epsilon} the patterns are cellular with local fourfold coordination and differ from the theoretically expected Kueppers-Lortz unstable state. Stable as well as intermittent defect-free square lattices exist over certain parameter ranges. Over other ranges defects dynamically disrupt the lattice but cellular flow and local fourfold coordination is maintained. {copyright} {ital 1998} {ital The American Physical Society}

• DOE Contract Number: FG03-87ER13738
• OSTI ID: 665026
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 4 Vol. 81; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BIFURCATION
CONVECTION
FLUIDS
PATTERN RECOGNITION
ROTATION
STABILITY