Square patterns in Rayleigh-Benard convection with rotation about a vertical axis

Details Square patterns in Rayleigh-Benard convection with rotation about a vertical axis Square patterns in Rayleigh-Benard convection with rotation about a vertical axis

1998-02-02

arxiv.org/abs/patt-sol/9802002v1

Nonlinear Sciences

Pattern Formation and Solitons

ReVTeX, 4 pages, 7 eps figures included

Scientific paper

10.1103/PhysRevLett.81.806

We present experimental results for Rayleigh-Benard convection with rotation about a vertical axis at dimensionless rotation rates in the range 0 to 250 and upto 20% above the onset. Critical Rayleigh numbers and wavenumbers agree with predictions of linear stability analysis. For rotation rates greater than 70 and close to onset, the patterns are cellular with local four-fold coordination and differ from the theoretically expected Kuppers-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 four-fold coordination is maintained.

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